TY  - JOUR
AU  - Obradović, Milena
AU  - Daković, Aleksandra
AU  - Smiljanić, Danijela
AU  - Marković, Marija
AU  - Ožegović, Milica
AU  - Krstić, Jugoslav
AU  - Vuković, Nikola
AU  - Milojević-Rakić, Maja
PY  - 2024
UR  - https://ritnms.itnms.ac.rs/handle/123456789/1222
AB  - Organobentonites have been applied for the removal of two common non-steroidal anti-inflammatory drugs, ibuprofen (IBU) and diclofenac sodium (DS), from aqueous solutions. Two surfactants, one with and the other without benzyl group (octadecyldimethylbenzylammonium chloride, ODMBA, and hexadecyltrimethylammonium bromide, HDTMA), in amounts equivalent to 50, 75, and 100% of the cation exchange capacity of bentonite were used for the preparation of organobentonites. Successful modification of bentonite was confirmed by several methods: X-ray powder diffraction (XRPD), point of the zero charge (pHPZC), determination of exchanged inorganic cations in bentonite, determination of textural properties, and scanning electron microscopy (SEM). Kinetic and thermodynamic data on the adsorption of IBU and DS showed that drug adsorption was controlled by the type and the amount of surfactant incorporated into the bentonite and by their arrangement in the interlayer space and at the surface of organobentonites. The adsorption of both drugs increased with an increase in the amount of both surfactants in organobentonites. The presence of the benzyl group in organobentonites enhanced the adsorption of IBU and DS and was more pronounced for IBU. Drug adsorption fits the pseudo-second-order kinetic model the best. The thermodynamic data revealed that the adsorption process was endothermic in nature and with increase of the amount of both surfactants drug adsorption processes were more spontaneous. The results obtained from this study revealed that adsorbents based on surfactants modified bentonite are promising candidates for IBU and DS removal from contaminated water.
PB  - MDPI
T2  - Processes
T1  - Bentonite Modified with Surfactants—Efficient Adsorbents for the Removal of Non-Steroidal Anti-Inflammatory Drugs
IS  - 1
SP  - 96
VL  - 12
DO  - 10.3390/pr12010096
ER  - 

@article{
author = "Obradović, Milena and Daković, Aleksandra and Smiljanić, Danijela and Marković, Marija and Ožegović, Milica and Krstić, Jugoslav and Vuković, Nikola and Milojević-Rakić, Maja",
year = "2024",
abstract = "Organobentonites have been applied for the removal of two common non-steroidal anti-inflammatory drugs, ibuprofen (IBU) and diclofenac sodium (DS), from aqueous solutions. Two surfactants, one with and the other without benzyl group (octadecyldimethylbenzylammonium chloride, ODMBA, and hexadecyltrimethylammonium bromide, HDTMA), in amounts equivalent to 50, 75, and 100% of the cation exchange capacity of bentonite were used for the preparation of organobentonites. Successful modification of bentonite was confirmed by several methods: X-ray powder diffraction (XRPD), point of the zero charge (pHPZC), determination of exchanged inorganic cations in bentonite, determination of textural properties, and scanning electron microscopy (SEM). Kinetic and thermodynamic data on the adsorption of IBU and DS showed that drug adsorption was controlled by the type and the amount of surfactant incorporated into the bentonite and by their arrangement in the interlayer space and at the surface of organobentonites. The adsorption of both drugs increased with an increase in the amount of both surfactants in organobentonites. The presence of the benzyl group in organobentonites enhanced the adsorption of IBU and DS and was more pronounced for IBU. Drug adsorption fits the pseudo-second-order kinetic model the best. The thermodynamic data revealed that the adsorption process was endothermic in nature and with increase of the amount of both surfactants drug adsorption processes were more spontaneous. The results obtained from this study revealed that adsorbents based on surfactants modified bentonite are promising candidates for IBU and DS removal from contaminated water.",
publisher = "MDPI",
journal = "Processes",
title = "Bentonite Modified with Surfactants—Efficient Adsorbents for the Removal of Non-Steroidal Anti-Inflammatory Drugs",
number = "1",
pages = "96",
volume = "12",
doi = "10.3390/pr12010096"
}

Obradović, M., Daković, A., Smiljanić, D., Marković, M., Ožegović, M., Krstić, J., Vuković, N.,& Milojević-Rakić, M.. (2024). Bentonite Modified with Surfactants—Efficient Adsorbents for the Removal of Non-Steroidal Anti-Inflammatory Drugs. in Processes
MDPI., 12(1), 96.
https://doi.org/10.3390/pr12010096

Obradović M, Daković A, Smiljanić D, Marković M, Ožegović M, Krstić J, Vuković N, Milojević-Rakić M. Bentonite Modified with Surfactants—Efficient Adsorbents for the Removal of Non-Steroidal Anti-Inflammatory Drugs. in Processes. 2024;12(1):96.
doi:10.3390/pr12010096 .

Obradović, Milena, Daković, Aleksandra, Smiljanić, Danijela, Marković, Marija, Ožegović, Milica, Krstić, Jugoslav, Vuković, Nikola, Milojević-Rakić, Maja, "Bentonite Modified with Surfactants—Efficient Adsorbents for the Removal of Non-Steroidal Anti-Inflammatory Drugs" in Processes, 12, no. 1 (2024):96,
https://doi.org/10.3390/pr12010096 . .

TY  - CONF
AU  - Marković, Marija
AU  - Obradović, Milena
AU  - Smiljanić, Danijela
AU  - Ožegović, Milica
AU  - Daković, Aleksandra
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/1006
AB  - Природни минерали, зеолит и бентонит, модификовани са различитим
количинама катјонског сурфактанта, хексадецилтриметиламонијум-бромида су испи-
тивани као адсорбенти за уклањање диклофенака из водених раствора. Адсорбоване
количине диклофенака су расле са порастом количине сурфактанта код органозеолита
као и код органобентонита. Разлике у структури полазних минерала су условиле и
разлике у адсорпцији диклофенака на органозеолиту и органобентониту. Највећа
адсорпција диклофенака је постигнута на органобентониту код кога су сви неоргански
катјони измењени са сурфактантом. Резултати су показали да се органоминерали могу
разматрати као ефикасни адсорбенти за уклањање диклофенака из воде.
AB  - Natural minerals, zeolite and bentonite, modified with different amounts of
cationic surfactant, hexadecyltrimethylammonium bromide, were investigated as adsorbents
for the removal of diclofenac from aqueous solutions. The adsorbed amount of diclofenac
increased with the increasing the amount of surfactant in organozeolite as well as in
organobentonite. Differences in the structure of the starting minerals caused differences in
the adsorption of diclofenac on organozeolite and organobentonite. The highest adsorption
of diclofenac was achieved on organobentonite where all inorganic cations were exchanged
with surfactant. The results showed that organominerals can be considered as effective asorbents for the removal of diclofenac from water.
PB  - Beograd : Savez inženjera i tehničara Srbije
C3  - 44. Međunarodna konferencija Vodovod i kanalizacija '23
T1  - Примена органоминерала за уклањање емергентног загађивача диклофенака
T1  - Application of organominerals for the removal of the emerging contaminant diclofenac
EP  - 235
SP  - 229
ER  - 

@conference{
author = "Marković, Marija and Obradović, Milena and Smiljanić, Danijela and Ožegović, Milica and Daković, Aleksandra",
year = "2023",
abstract = "Природни минерали, зеолит и бентонит, модификовани са различитим
количинама катјонског сурфактанта, хексадецилтриметиламонијум-бромида су испи-
тивани као адсорбенти за уклањање диклофенака из водених раствора. Адсорбоване
количине диклофенака су расле са порастом количине сурфактанта код органозеолита
као и код органобентонита. Разлике у структури полазних минерала су условиле и
разлике у адсорпцији диклофенака на органозеолиту и органобентониту. Највећа
адсорпција диклофенака је постигнута на органобентониту код кога су сви неоргански
катјони измењени са сурфактантом. Резултати су показали да се органоминерали могу
разматрати као ефикасни адсорбенти за уклањање диклофенака из воде., Natural minerals, zeolite and bentonite, modified with different amounts of
cationic surfactant, hexadecyltrimethylammonium bromide, were investigated as adsorbents
for the removal of diclofenac from aqueous solutions. The adsorbed amount of diclofenac
increased with the increasing the amount of surfactant in organozeolite as well as in
organobentonite. Differences in the structure of the starting minerals caused differences in
the adsorption of diclofenac on organozeolite and organobentonite. The highest adsorption
of diclofenac was achieved on organobentonite where all inorganic cations were exchanged
with surfactant. The results showed that organominerals can be considered as effective asorbents for the removal of diclofenac from water.",
publisher = "Beograd : Savez inženjera i tehničara Srbije",
journal = "44. Međunarodna konferencija Vodovod i kanalizacija '23",
title = "Примена органоминерала за уклањање емергентног загађивача диклофенака, Application of organominerals for the removal of the emerging contaminant diclofenac",
pages = "235-229"
}

Marković, M., Obradović, M., Smiljanić, D., Ožegović, M.,& Daković, A.. (2023). Примена органоминерала за уклањање емергентног загађивача диклофенака. in 44. Međunarodna konferencija Vodovod i kanalizacija '23
Beograd : Savez inženjera i tehničara Srbije., 229-235.

Marković M, Obradović M, Smiljanić D, Ožegović M, Daković A. Примена органоминерала за уклањање емергентног загађивача диклофенака. in 44. Međunarodna konferencija Vodovod i kanalizacija '23. 2023;:229-235..

Marković, Marija, Obradović, Milena, Smiljanić, Danijela, Ožegović, Milica, Daković, Aleksandra, "Примена органоминерала за уклањање емергентног загађивача диклофенака" in 44. Međunarodna konferencija Vodovod i kanalizacija '23 (2023):229-235.

TY  - CONF
AU  - Smiljanić, Danijela
AU  - Daković, Aleksandra
AU  - Marković, Marija
AU  - Obradović, Milena
AU  - Ožegović, Milica
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/724
AB  - Površinski modifikovani prirodni zeoliti sa katjonskim surfaktantima su se pokazali kao obećavajući adsorbenti za uklanjanje emergentnih zagađivača - nesteroidnih antiinflamatornih lekova (diklofenak, ibuprofen, naproksen i ketoprofen). Nelinaran oblik adsorpcionih izotermi kao i adsorpcioni kapaciteti (Qmax vrednosti iz Langmirovog modela) poslužili su da se izvedu zaključci o mehanizmu adsorpcije i uticaju izbora polaznog materijala, tipa i količine surfaktanta na adsorpciju odabranih lekova.
PB  - Beograd : Institut za tehnologiju nuklearnih i drugih mineralnih sirovina
C3  - 14. Simpozijum „Rudarstvo 2023“ Održivi razvoj u rudarstvu i energetici
T1  - Površinski modifikovani zeoliti - efikasni adsorbenti emergentnih zagađivača
EP  - 36
SP  - 29
ER  - 

@conference{
author = "Smiljanić, Danijela and Daković, Aleksandra and Marković, Marija and Obradović, Milena and Ožegović, Milica",
year = "2023",
abstract = "Površinski modifikovani prirodni zeoliti sa katjonskim surfaktantima su se pokazali kao obećavajući adsorbenti za uklanjanje emergentnih zagađivača - nesteroidnih antiinflamatornih lekova (diklofenak, ibuprofen, naproksen i ketoprofen). Nelinaran oblik adsorpcionih izotermi kao i adsorpcioni kapaciteti (Qmax vrednosti iz Langmirovog modela) poslužili su da se izvedu zaključci o mehanizmu adsorpcije i uticaju izbora polaznog materijala, tipa i količine surfaktanta na adsorpciju odabranih lekova.",
publisher = "Beograd : Institut za tehnologiju nuklearnih i drugih mineralnih sirovina",
journal = "14. Simpozijum „Rudarstvo 2023“ Održivi razvoj u rudarstvu i energetici",
title = "Površinski modifikovani zeoliti - efikasni adsorbenti emergentnih zagađivača",
pages = "36-29"
}

Smiljanić, D., Daković, A., Marković, M., Obradović, M.,& Ožegović, M.. (2023). Površinski modifikovani zeoliti - efikasni adsorbenti emergentnih zagađivača. in 14. Simpozijum „Rudarstvo 2023“ Održivi razvoj u rudarstvu i energetici
Beograd : Institut za tehnologiju nuklearnih i drugih mineralnih sirovina., 29-36.

Smiljanić D, Daković A, Marković M, Obradović M, Ožegović M. Površinski modifikovani zeoliti - efikasni adsorbenti emergentnih zagađivača. in 14. Simpozijum „Rudarstvo 2023“ Održivi razvoj u rudarstvu i energetici. 2023;:29-36..

Smiljanić, Danijela, Daković, Aleksandra, Marković, Marija, Obradović, Milena, Ožegović, Milica, "Površinski modifikovani zeoliti - efikasni adsorbenti emergentnih zagađivača" in 14. Simpozijum „Rudarstvo 2023“ Održivi razvoj u rudarstvu i energetici (2023):29-36.

TY  - CONF
AU  - Marković, Marija
AU  - Daković, Aleksandra
AU  - Smiljanić, Danijela
AU  - Obradović, Milena
AU  - Ožegović, Milica
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/722
AB  - In this study three bentonite clays (bentonite from deposit Beretnica in Republic of Serbia, commercial bentonite and gray
clay from Šipovo deposit in Bosnia and Herzegovina) were investigated as adsorbents of aflatoxin B1 (AFB1). In a single
in vitro AFB1 adsorption experiment, all three bentonites showed high adsorption efficiency for AFB1 at pH 5. The effect
of adsorbent mass on AFB1 adsorption was also studied, with the same initial AFB1 concentration, at pH 3, and it was
shown that toxin adsorption decreased with decreasing amount of each bentonite in suspension. Thermal analysis was
performed in order to determine the structural differences between investigated bentonites. Results showed that gray clay
was trans-vacant bentonite while other two clays were cis-vacant bentonites. Aflatoxin B1 adsorption experiments, at pH
3, showed that trans-vacant gray bentonite had higher affinity for AFB1 than commercial cis-vacant bentonite. The
highest adsorption was achieved with cis-vacant bentonite from Beretnica deposit.
PB  - Belgrade : Association of Metallurgical Engineers of Serbia
C3  - 5th Metallurgical & Materials Engineering Congress of South-East Europe
T1  - Bentonite clays as aflatoxin B1 adsorbents
EP  - 16
SP  - 12
ER  - 

@conference{
author = "Marković, Marija and Daković, Aleksandra and Smiljanić, Danijela and Obradović, Milena and Ožegović, Milica",
year = "2023",
abstract = "In this study three bentonite clays (bentonite from deposit Beretnica in Republic of Serbia, commercial bentonite and gray
clay from Šipovo deposit in Bosnia and Herzegovina) were investigated as adsorbents of aflatoxin B1 (AFB1). In a single
in vitro AFB1 adsorption experiment, all three bentonites showed high adsorption efficiency for AFB1 at pH 5. The effect
of adsorbent mass on AFB1 adsorption was also studied, with the same initial AFB1 concentration, at pH 3, and it was
shown that toxin adsorption decreased with decreasing amount of each bentonite in suspension. Thermal analysis was
performed in order to determine the structural differences between investigated bentonites. Results showed that gray clay
was trans-vacant bentonite while other two clays were cis-vacant bentonites. Aflatoxin B1 adsorption experiments, at pH
3, showed that trans-vacant gray bentonite had higher affinity for AFB1 than commercial cis-vacant bentonite. The
highest adsorption was achieved with cis-vacant bentonite from Beretnica deposit.",
publisher = "Belgrade : Association of Metallurgical Engineers of Serbia",
journal = "5th Metallurgical & Materials Engineering Congress of South-East Europe",
title = "Bentonite clays as aflatoxin B1 adsorbents",
pages = "16-12"
}

Marković, M., Daković, A., Smiljanić, D., Obradović, M.,& Ožegović, M.. (2023). Bentonite clays as aflatoxin B1 adsorbents. in 5th Metallurgical & Materials Engineering Congress of South-East Europe
Belgrade : Association of Metallurgical Engineers of Serbia., 12-16.

Marković M, Daković A, Smiljanić D, Obradović M, Ožegović M. Bentonite clays as aflatoxin B1 adsorbents. in 5th Metallurgical & Materials Engineering Congress of South-East Europe. 2023;:12-16..

Marković, Marija, Daković, Aleksandra, Smiljanić, Danijela, Obradović, Milena, Ožegović, Milica, "Bentonite clays as aflatoxin B1 adsorbents" in 5th Metallurgical & Materials Engineering Congress of South-East Europe (2023):12-16.

TY  - CONF
AU  - Smiljanić, Danijela
AU  - Daković, Aleksandra
AU  - Obradović, Milena
AU  - Marković, Marija
AU  - Ožegović, Milica
AU  - Pantić, Milena
AU  - Krajišnik, Danina
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/723
AB  - In this study bentonite was modified with two chitosans, commercial or chitosan synthesized from mushroom. Obtained
products were subsequently treated with hexadecyltrimethyl ammonium bromide in the amount of 50% of the bentonite`s
CEC value. Starting material and all prepared composites were characterized by FTIR-ATR spectroscopy in order to
confirm modification with organic molecules. Adsorption of zearalenone (ZEN) by clay-chitosan composites and claychitosan-surfactant composites was investigated at pH 3. Results showed that adsorption of ZEN was higher for
composites that had both chitosan and surfactant, confirming that surfactant ions are responsible for ZEN adsorption.
Additionally, the effect of adsorbent mass on ZEN adsorption was investigated for clay-chitosan-surfactant composites
(pH 3) and results have shown that adsorption increased with increasing the amount of both composites.
PB  - Belgrade : Association of Metallurgical Engineers of Serbia
C3  - 5th Metallurgical & Materials Engineering Congress of South-East Europe
T1  - Clay-chitosan-surfactant composites as efficient adsorbents of zearalenone
EP  - 376
SP  - 371
ER  - 

@conference{
author = "Smiljanić, Danijela and Daković, Aleksandra and Obradović, Milena and Marković, Marija and Ožegović, Milica and Pantić, Milena and Krajišnik, Danina",
year = "2023",
abstract = "In this study bentonite was modified with two chitosans, commercial or chitosan synthesized from mushroom. Obtained
products were subsequently treated with hexadecyltrimethyl ammonium bromide in the amount of 50% of the bentonite`s
CEC value. Starting material and all prepared composites were characterized by FTIR-ATR spectroscopy in order to
confirm modification with organic molecules. Adsorption of zearalenone (ZEN) by clay-chitosan composites and claychitosan-surfactant composites was investigated at pH 3. Results showed that adsorption of ZEN was higher for
composites that had both chitosan and surfactant, confirming that surfactant ions are responsible for ZEN adsorption.
Additionally, the effect of adsorbent mass on ZEN adsorption was investigated for clay-chitosan-surfactant composites
(pH 3) and results have shown that adsorption increased with increasing the amount of both composites.",
publisher = "Belgrade : Association of Metallurgical Engineers of Serbia",
journal = "5th Metallurgical & Materials Engineering Congress of South-East Europe",
title = "Clay-chitosan-surfactant composites as efficient adsorbents of zearalenone",
pages = "376-371"
}

Smiljanić, D., Daković, A., Obradović, M., Marković, M., Ožegović, M., Pantić, M.,& Krajišnik, D.. (2023). Clay-chitosan-surfactant composites as efficient adsorbents of zearalenone. in 5th Metallurgical & Materials Engineering Congress of South-East Europe
Belgrade : Association of Metallurgical Engineers of Serbia., 371-376.

Smiljanić D, Daković A, Obradović M, Marković M, Ožegović M, Pantić M, Krajišnik D. Clay-chitosan-surfactant composites as efficient adsorbents of zearalenone. in 5th Metallurgical & Materials Engineering Congress of South-East Europe. 2023;:371-376..

Smiljanić, Danijela, Daković, Aleksandra, Obradović, Milena, Marković, Marija, Ožegović, Milica, Pantić, Milena, Krajišnik, Danina, "Clay-chitosan-surfactant composites as efficient adsorbents of zearalenone" in 5th Metallurgical & Materials Engineering Congress of South-East Europe (2023):371-376.

TY  - CONF
AU  - Smiljanić, Danijela
AU  - Daković, Aleksandra
AU  - Obradović, Milena
AU  - Ožegović, Milica
AU  - Marković, Marija
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/1195
AB  - Numerous chemical compounds present in natural waters and wastewater are resistant to
conventional water treatments and persist in treated effluents. Among these substances,
pharmaceuticals, due to their widespread use, raise special concern due to their potentially
harmful effects on human health especially when they reach drinking water. One of the most
efficient technique for removal of pharmaceuticals from polluted water is their adsorption on
various adsorbents, such as activated carbons, clays (kaolin, bentonite, etc.) and zeolites. In
this study, the potential of modified bentonite for removal of carbamazepine, a
pharmaceutical with anticonvulsant and mood-stabilizing properties, was investigated. The
natural bentonite from Šipovo deposit, Bosnia and Herzegovina, was modified with the
cationic surfactant Arquad®2HT-75 in amounts equivalent to 50% and 100% of the
bentonite's cationic exchange capacity. Characterization of prepared samples by Fouriertransform
infrared spectroscopy and Simultaneous Thermal Analysis, confirmed presence of
surfactant in modified bentonites. Results on carbamazepine removal by modified bentonites
showed that its adsorption increased with increasing of the amount of surfactant as well as
with increasing of the initial pharmaceutical concentration. The highest adsorption of
carbamazepine was achieved with bentonite containing the highest amount of surfactant.
Since the natural bentonite has no affinity to remove carbamazepine, these findings suggest
that modified bentonite is a promising adsorbent for its removal from contaminated water.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Twenty-First Young Researchers’ Conference - Materials Science and Engineering
T1  - Bentonite modified with cationic surfactant as promissing adsorbent for carbamazepine
EP  - 20
SP  - 20
ER  - 

@conference{
author = "Smiljanić, Danijela and Daković, Aleksandra and Obradović, Milena and Ožegović, Milica and Marković, Marija",
year = "2023",
abstract = "Numerous chemical compounds present in natural waters and wastewater are resistant to
conventional water treatments and persist in treated effluents. Among these substances,
pharmaceuticals, due to their widespread use, raise special concern due to their potentially
harmful effects on human health especially when they reach drinking water. One of the most
efficient technique for removal of pharmaceuticals from polluted water is their adsorption on
various adsorbents, such as activated carbons, clays (kaolin, bentonite, etc.) and zeolites. In
this study, the potential of modified bentonite for removal of carbamazepine, a
pharmaceutical with anticonvulsant and mood-stabilizing properties, was investigated. The
natural bentonite from Šipovo deposit, Bosnia and Herzegovina, was modified with the
cationic surfactant Arquad®2HT-75 in amounts equivalent to 50% and 100% of the
bentonite's cationic exchange capacity. Characterization of prepared samples by Fouriertransform
infrared spectroscopy and Simultaneous Thermal Analysis, confirmed presence of
surfactant in modified bentonites. Results on carbamazepine removal by modified bentonites
showed that its adsorption increased with increasing of the amount of surfactant as well as
with increasing of the initial pharmaceutical concentration. The highest adsorption of
carbamazepine was achieved with bentonite containing the highest amount of surfactant.
Since the natural bentonite has no affinity to remove carbamazepine, these findings suggest
that modified bentonite is a promising adsorbent for its removal from contaminated water.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Twenty-First Young Researchers’ Conference - Materials Science and Engineering",
title = "Bentonite modified with cationic surfactant as promissing adsorbent for carbamazepine",
pages = "20-20"
}

Smiljanić, D., Daković, A., Obradović, M., Ožegović, M.,& Marković, M.. (2023). Bentonite modified with cationic surfactant as promissing adsorbent for carbamazepine. in Twenty-First Young Researchers’ Conference - Materials Science and Engineering
Belgrade : Institute of Technical Sciences of SASA., 20-20.

Smiljanić D, Daković A, Obradović M, Ožegović M, Marković M. Bentonite modified with cationic surfactant as promissing adsorbent for carbamazepine. in Twenty-First Young Researchers’ Conference - Materials Science and Engineering. 2023;:20-20..

Smiljanić, Danijela, Daković, Aleksandra, Obradović, Milena, Ožegović, Milica, Marković, Marija, "Bentonite modified with cationic surfactant as promissing adsorbent for carbamazepine" in Twenty-First Young Researchers’ Conference - Materials Science and Engineering (2023):20-20.

TY  - CONF
AU  - Krajišnik, Danina
AU  - Uskoković-Marković, Snežana
AU  - Daković, Aleksandra
AU  - Smiljanić, Danijela
AU  - Kozarski, Maja
AU  - Lazić, Vesna
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/721
AB  - In this study, the preparation and characterization of chitosan–clay composites as potential carriers for tetracycline were performed. The composites based on bentonite (from the deposit of Beretnica, Republic of Serbia) and chitosan were prepared. Two types of chitosan were used for the preparation of the composites: commercial low molecular weight chitosan and chitosan isolated from fruit bodies of the commercially grown mushroom Agaricus bisporus. Adsorption of tetracycline hydrochloride onto natural clay and chitosan-clay composites from aqueous media (pH 3.4) was studied. The amounts of adsorbed antibiotic were determined spectrophotometrically from the difference between the initial concentrations of tetracycline and the amounts remaining in the aqueous medium after dynamic equilibrium. Characterization of the natural clay and chitosan-clay composites before and after adsorption of tetracycline was performed by zeta potential measurements. Adsorption of tetracycline followed a nonlinear isotherm for the natural clay and composites. The Langmuir equation showed the best fit of the equilibrium adsorption data over the entire concentration range (0.05 – 1 mg/mL) and themaximum adsorbed amount of the drug on the natural clay and both chitosan-clay composites was up to ~ 200 mg/g. Only minor differences in the adsorption of the drug were observed between the composites containing commercial chitosan and the chitosan isolated from mushrooms. The observed decrease in zeta potentials of the drug chitosan–clay complexes revealed the interactions of the composite surface with tetracycline molecules. The obtained results indicate the potential of the chitosan-clay composites for the development of therapeutic systems for topical application and suggest the possibility of using fungi as a renewable source of chitosan.
PB  - Belgrade : Association of Metallurgical Engineers of Serbia
C3  - 5th Metallurgical & Materials Engineering Congress of South-East Europe
T1  - Preparation and characterization of chitosan–clay composites as potential drug carriers
EP  - 127
SP  - 123
ER  - 

@conference{
author = "Krajišnik, Danina and Uskoković-Marković, Snežana and Daković, Aleksandra and Smiljanić, Danijela and Kozarski, Maja and Lazić, Vesna",
year = "2023",
abstract = "In this study, the preparation and characterization of chitosan–clay composites as potential carriers for tetracycline were performed. The composites based on bentonite (from the deposit of Beretnica, Republic of Serbia) and chitosan were prepared. Two types of chitosan were used for the preparation of the composites: commercial low molecular weight chitosan and chitosan isolated from fruit bodies of the commercially grown mushroom Agaricus bisporus. Adsorption of tetracycline hydrochloride onto natural clay and chitosan-clay composites from aqueous media (pH 3.4) was studied. The amounts of adsorbed antibiotic were determined spectrophotometrically from the difference between the initial concentrations of tetracycline and the amounts remaining in the aqueous medium after dynamic equilibrium. Characterization of the natural clay and chitosan-clay composites before and after adsorption of tetracycline was performed by zeta potential measurements. Adsorption of tetracycline followed a nonlinear isotherm for the natural clay and composites. The Langmuir equation showed the best fit of the equilibrium adsorption data over the entire concentration range (0.05 – 1 mg/mL) and themaximum adsorbed amount of the drug on the natural clay and both chitosan-clay composites was up to ~ 200 mg/g. Only minor differences in the adsorption of the drug were observed between the composites containing commercial chitosan and the chitosan isolated from mushrooms. The observed decrease in zeta potentials of the drug chitosan–clay complexes revealed the interactions of the composite surface with tetracycline molecules. The obtained results indicate the potential of the chitosan-clay composites for the development of therapeutic systems for topical application and suggest the possibility of using fungi as a renewable source of chitosan.",
publisher = "Belgrade : Association of Metallurgical Engineers of Serbia",
journal = "5th Metallurgical & Materials Engineering Congress of South-East Europe",
title = "Preparation and characterization of chitosan–clay composites as potential drug carriers",
pages = "127-123"
}

Krajišnik, D., Uskoković-Marković, S., Daković, A., Smiljanić, D., Kozarski, M.,& Lazić, V.. (2023). Preparation and characterization of chitosan–clay composites as potential drug carriers. in 5th Metallurgical & Materials Engineering Congress of South-East Europe
Belgrade : Association of Metallurgical Engineers of Serbia., 123-127.

Krajišnik D, Uskoković-Marković S, Daković A, Smiljanić D, Kozarski M, Lazić V. Preparation and characterization of chitosan–clay composites as potential drug carriers. in 5th Metallurgical & Materials Engineering Congress of South-East Europe. 2023;:123-127..

Krajišnik, Danina, Uskoković-Marković, Snežana, Daković, Aleksandra, Smiljanić, Danijela, Kozarski, Maja, Lazić, Vesna, "Preparation and characterization of chitosan–clay composites as potential drug carriers" in 5th Metallurgical & Materials Engineering Congress of South-East Europe (2023):123-127.

TY  - CONF
AU  - Jaćević, Vesna
AU  - Obradović, Milena
AU  - Milovanović, Zoran
AU  - Amidžić, Ljiljana
AU  - Nežić, Lana
AU  - Knežević, Milena
AU  - Krajišnik, Danina
AU  - Daković, Aleksandra
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/720
AB  - Natural bentonite (NBNT) and natural halloysite (NHAL), as clay minerals, are used in animal nutrition because their absorption/adsorption properties contribute significantly to animals' health [1]. Clay minerals have also emerged special attention as potential materials for biomedical applications, due to their favorable physicochemical and functional related characteristics along with good biocompatibility. Since it has been proved natural clays have their toxicologcal profiles, and that any modification can change this profile, we evaluated acute toxicology on selected materials.
PB  - British Journal of Pharmacology
C3  - 19th World Congress of Basic & Clinical Pharmacology 2023
T1  - Evaluation of acute toxicological profile of the selected natural clays in rats
EP  - 840
IS  - 51
SP  - 839
VL  - 180
ER  - 

@conference{
author = "Jaćević, Vesna and Obradović, Milena and Milovanović, Zoran and Amidžić, Ljiljana and Nežić, Lana and Knežević, Milena and Krajišnik, Danina and Daković, Aleksandra",
year = "2023",
abstract = "Natural bentonite (NBNT) and natural halloysite (NHAL), as clay minerals, are used in animal nutrition because their absorption/adsorption properties contribute significantly to animals' health [1]. Clay minerals have also emerged special attention as potential materials for biomedical applications, due to their favorable physicochemical and functional related characteristics along with good biocompatibility. Since it has been proved natural clays have their toxicologcal profiles, and that any modification can change this profile, we evaluated acute toxicology on selected materials.",
publisher = "British Journal of Pharmacology",
journal = "19th World Congress of Basic & Clinical Pharmacology 2023",
title = "Evaluation of acute toxicological profile of the selected natural clays in rats",
pages = "840-839",
number = "51",
volume = "180"
}

Jaćević, V., Obradović, M., Milovanović, Z., Amidžić, L., Nežić, L., Knežević, M., Krajišnik, D.,& Daković, A.. (2023). Evaluation of acute toxicological profile of the selected natural clays in rats. in 19th World Congress of Basic & Clinical Pharmacology 2023
British Journal of Pharmacology., 180(51), 839-840.

Jaćević V, Obradović M, Milovanović Z, Amidžić L, Nežić L, Knežević M, Krajišnik D, Daković A. Evaluation of acute toxicological profile of the selected natural clays in rats. in 19th World Congress of Basic & Clinical Pharmacology 2023. 2023;180(51):839-840..

Jaćević, Vesna, Obradović, Milena, Milovanović, Zoran, Amidžić, Ljiljana, Nežić, Lana, Knežević, Milena, Krajišnik, Danina, Daković, Aleksandra, "Evaluation of acute toxicological profile of the selected natural clays in rats" in 19th World Congress of Basic & Clinical Pharmacology 2023, 180, no. 51 (2023):839-840.

TY  - JOUR
AU  - Smiljanić, Danijela
AU  - Daković, Aleksandra
AU  - Obradović, Milena
AU  - Ožegović, Milica
AU  - Marković, Marija
AU  - Rottinghaus, George E.
AU  - de Gennaro, Bruno
PY  - 2023
UR  - https://ritnms.itnms.ac.rs/handle/123456789/648
AB  - Modified phillipsite samples were prepared with two different amounts (monolayer and bilayer coverage) of surfactants octadecyldimethylbenzylammonium chloride (O) and dodecylamine (D). Composites were characterized by Fourier transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR), thermal analysis and determination of zeta potential, and subsequently tested for removal of diclofenac sodium (DCF). Drug adsorption experiments were performed under different initial DCF concentrations and different contact times. In order to investigate the influence of the chemical structure of surfactants used for modification of phillipsite on the preparation and properties of composites and DCF adsorption, experimental data were compared with previously published results on DCF adsorption by composites containing phillipsite and the same amounts of surfactants cetylpyridinium chloride (C) and Arquad((R))2HT-75 (A). DCF adsorption isotherms for O and D composites showed a better fit with the Langmuir model with maximum adsorption capacities between 12.3 and 38.4 mg/g and are similar to those for C and A composites, while kinetics run followed a pseudo-second-order model. Composites containing either benzyl or pyridine functional groups showed higher adsorption of DCF, implying that surfactant structure has a significant impact on drug adsorption. Drug adsorption onto O, D, C and A composites was also confirmed by FTIR-ATR spectroscopy and zeta potential measurements.
PB  - Basel : MDPI
T2  - Catalysts
T1  - Influence of the Type and the Amount of Surfactant in Phillipsite on Adsorption of Diclofenac Sodium
IS  - 1
VL  - 13
DO  - 10.3390/catal13010071
UR  - conv_963
ER  - 

@article{
author = "Smiljanić, Danijela and Daković, Aleksandra and Obradović, Milena and Ožegović, Milica and Marković, Marija and Rottinghaus, George E. and de Gennaro, Bruno",
year = "2023",
abstract = "Modified phillipsite samples were prepared with two different amounts (monolayer and bilayer coverage) of surfactants octadecyldimethylbenzylammonium chloride (O) and dodecylamine (D). Composites were characterized by Fourier transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR), thermal analysis and determination of zeta potential, and subsequently tested for removal of diclofenac sodium (DCF). Drug adsorption experiments were performed under different initial DCF concentrations and different contact times. In order to investigate the influence of the chemical structure of surfactants used for modification of phillipsite on the preparation and properties of composites and DCF adsorption, experimental data were compared with previously published results on DCF adsorption by composites containing phillipsite and the same amounts of surfactants cetylpyridinium chloride (C) and Arquad((R))2HT-75 (A). DCF adsorption isotherms for O and D composites showed a better fit with the Langmuir model with maximum adsorption capacities between 12.3 and 38.4 mg/g and are similar to those for C and A composites, while kinetics run followed a pseudo-second-order model. Composites containing either benzyl or pyridine functional groups showed higher adsorption of DCF, implying that surfactant structure has a significant impact on drug adsorption. Drug adsorption onto O, D, C and A composites was also confirmed by FTIR-ATR spectroscopy and zeta potential measurements.",
publisher = "Basel : MDPI",
journal = "Catalysts",
title = "Influence of the Type and the Amount of Surfactant in Phillipsite on Adsorption of Diclofenac Sodium",
number = "1",
volume = "13",
doi = "10.3390/catal13010071",
url = "conv_963"
}

Smiljanić, D., Daković, A., Obradović, M., Ožegović, M., Marković, M., Rottinghaus, G. E.,& de Gennaro, B.. (2023). Influence of the Type and the Amount of Surfactant in Phillipsite on Adsorption of Diclofenac Sodium. in Catalysts
Basel : MDPI., 13(1).
https://doi.org/10.3390/catal13010071
conv_963

Smiljanić D, Daković A, Obradović M, Ožegović M, Marković M, Rottinghaus GE, de Gennaro B. Influence of the Type and the Amount of Surfactant in Phillipsite on Adsorption of Diclofenac Sodium. in Catalysts. 2023;13(1).
doi:10.3390/catal13010071
conv_963 .

Smiljanić, Danijela, Daković, Aleksandra, Obradović, Milena, Ožegović, Milica, Marković, Marija, Rottinghaus, George E., de Gennaro, Bruno, "Influence of the Type and the Amount of Surfactant in Phillipsite on Adsorption of Diclofenac Sodium" in Catalysts, 13, no. 1 (2023),
https://doi.org/10.3390/catal13010071 .,
conv_963 .

TY  - JOUR
AU  - Obradović, Milena
AU  - Daković, Aleksandra
AU  - Smiljanić, Danijela
AU  - Ožegović, Milica
AU  - Marković, Marija
AU  - Rottinghaus, George E.
AU  - Krstić, Jugoslav
PY  - 2022
UR  - https://ritnms.itnms.ac.rs/handle/123456789/643
AB  - Cationic surfactant - octadecyldimethylbenzyl ammonium chloride (ODMBA) was used for modification of the three natural raw materials - bentonite, kaolin and zeolite. Adsorption of ODMBA by minerals occurred via ion exchange of inorganic cations on minerals with surfactant. Organomodified minerals - organobentonite (OB), organokaolin (OK) and organozeolite (OZ) were studied as adsorbents for removal of two non-steroidal anti-inflammatory drugs - ibuprofen (IBU) and diclofenac sodium (DS) at pH 7. For all systems, the pseudo-second order model showed the best correlation to kinetic experimental data. In all cases, the positive values of Delta H degrees indicated that the adsorption of both IBU and DS by organomodified minerals was endothermic in nature. Equilibrium data were better described by the Freundlich isotherm model, pointing to adsorbent heterogeneous active sites for adsorption. Under applied experimental conditions, the highest adsorption of both drugs was achieved by OB, while much lower capacities were observed for OK and OZ. Nonlinear isotherms and physicochemical characterization of organomodified minerals after drugs adsorption suggested complex mechanism consisting of hydrophobic interactions between hydrophobic part of the drugs and surfactants alkyl chains, electrostatic interactions of anionic forms of IBU and DS with the cationic "head" of ODMBA, as well as anion exchange of counterion ions from ODMBA micelle and anionic forms of both drugs. Adsorption of both IBU and DS was strongly dependent on the amount of ODMBA ions in the minerals.
PB  - Elsevier, Amsterdam
T2  - Microporous and Mesoporous Materials
T1  - Ibuprofen and diclofenac sodium adsorption onto functionalized minerals: Equilibrium, kinetic and thermodynamic studies
VL  - 335
DO  - 10.1016/j.micromeso.2022.111795
UR  - conv_945
ER  - 

@article{
author = "Obradović, Milena and Daković, Aleksandra and Smiljanić, Danijela and Ožegović, Milica and Marković, Marija and Rottinghaus, George E. and Krstić, Jugoslav",
year = "2022",
abstract = "Cationic surfactant - octadecyldimethylbenzyl ammonium chloride (ODMBA) was used for modification of the three natural raw materials - bentonite, kaolin and zeolite. Adsorption of ODMBA by minerals occurred via ion exchange of inorganic cations on minerals with surfactant. Organomodified minerals - organobentonite (OB), organokaolin (OK) and organozeolite (OZ) were studied as adsorbents for removal of two non-steroidal anti-inflammatory drugs - ibuprofen (IBU) and diclofenac sodium (DS) at pH 7. For all systems, the pseudo-second order model showed the best correlation to kinetic experimental data. In all cases, the positive values of Delta H degrees indicated that the adsorption of both IBU and DS by organomodified minerals was endothermic in nature. Equilibrium data were better described by the Freundlich isotherm model, pointing to adsorbent heterogeneous active sites for adsorption. Under applied experimental conditions, the highest adsorption of both drugs was achieved by OB, while much lower capacities were observed for OK and OZ. Nonlinear isotherms and physicochemical characterization of organomodified minerals after drugs adsorption suggested complex mechanism consisting of hydrophobic interactions between hydrophobic part of the drugs and surfactants alkyl chains, electrostatic interactions of anionic forms of IBU and DS with the cationic "head" of ODMBA, as well as anion exchange of counterion ions from ODMBA micelle and anionic forms of both drugs. Adsorption of both IBU and DS was strongly dependent on the amount of ODMBA ions in the minerals.",
publisher = "Elsevier, Amsterdam",
journal = "Microporous and Mesoporous Materials",
title = "Ibuprofen and diclofenac sodium adsorption onto functionalized minerals: Equilibrium, kinetic and thermodynamic studies",
volume = "335",
doi = "10.1016/j.micromeso.2022.111795",
url = "conv_945"
}

Obradović, M., Daković, A., Smiljanić, D., Ožegović, M., Marković, M., Rottinghaus, G. E.,& Krstić, J.. (2022). Ibuprofen and diclofenac sodium adsorption onto functionalized minerals: Equilibrium, kinetic and thermodynamic studies. in Microporous and Mesoporous Materials
Elsevier, Amsterdam., 335.
https://doi.org/10.1016/j.micromeso.2022.111795
conv_945

Obradović M, Daković A, Smiljanić D, Ožegović M, Marković M, Rottinghaus GE, Krstić J. Ibuprofen and diclofenac sodium adsorption onto functionalized minerals: Equilibrium, kinetic and thermodynamic studies. in Microporous and Mesoporous Materials. 2022;335.
doi:10.1016/j.micromeso.2022.111795
conv_945 .

Obradović, Milena, Daković, Aleksandra, Smiljanić, Danijela, Ožegović, Milica, Marković, Marija, Rottinghaus, George E., Krstić, Jugoslav, "Ibuprofen and diclofenac sodium adsorption onto functionalized minerals: Equilibrium, kinetic and thermodynamic studies" in Microporous and Mesoporous Materials, 335 (2022),
https://doi.org/10.1016/j.micromeso.2022.111795 .,
conv_945 .

TY  - CONF
AU  - Smiljanić, Danijela
AU  - Daković, Aleksandra
AU  - Spasojević, Milica
AU  - Obradović, Milena
AU  - Marković, Marija
AU  - Langella, Alessio
AU  - de Gennaro, Bruno
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/731
AB  - In this work phillipsite-rich tuff (P) was modified by using amounts of cetylpyridinium
chloride (C) equivalent to 70% and 140% of the zeolite external cation exchange capacity
(ECEC). Accordingly, composites were denoted as PC-70 and PC-140. Prepared composites
were characterized by ATR-FTIR spectroscopy. Additionally, to test the stability of surfactant
molecules attached to the tuff surface, composites were extensively washed with distilled
water, and zeta potential of unwashed and washed samples was measured. FTIR spectra
confirmed presence of C in both composites. Zeta potential measurements showed that
composite containing surfactant in the amount below the ECEC value (PC-70) has much
higher stability and thus is a more appropriate adsorbent for potential practical application for
removal of different pollutants.
PB  - Zagreb : Croatian Zeolite Association
C3  - 9th Croatian-Slovenian-Serbian Symposium on Zeolites
T1  - Composites of phillipsite-rich tuff and surfactant – their characterization and stability
EP  - 46
SP  - 43
ER  - 

@conference{
author = "Smiljanić, Danijela and Daković, Aleksandra and Spasojević, Milica and Obradović, Milena and Marković, Marija and Langella, Alessio and de Gennaro, Bruno",
year = "2021",
abstract = "In this work phillipsite-rich tuff (P) was modified by using amounts of cetylpyridinium
chloride (C) equivalent to 70% and 140% of the zeolite external cation exchange capacity
(ECEC). Accordingly, composites were denoted as PC-70 and PC-140. Prepared composites
were characterized by ATR-FTIR spectroscopy. Additionally, to test the stability of surfactant
molecules attached to the tuff surface, composites were extensively washed with distilled
water, and zeta potential of unwashed and washed samples was measured. FTIR spectra
confirmed presence of C in both composites. Zeta potential measurements showed that
composite containing surfactant in the amount below the ECEC value (PC-70) has much
higher stability and thus is a more appropriate adsorbent for potential practical application for
removal of different pollutants.",
publisher = "Zagreb : Croatian Zeolite Association",
journal = "9th Croatian-Slovenian-Serbian Symposium on Zeolites",
title = "Composites of phillipsite-rich tuff and surfactant – their characterization and stability",
pages = "46-43"
}

Smiljanić, D., Daković, A., Spasojević, M., Obradović, M., Marković, M., Langella, A.,& de Gennaro, B.. (2021). Composites of phillipsite-rich tuff and surfactant – their characterization and stability. in 9th Croatian-Slovenian-Serbian Symposium on Zeolites
Zagreb : Croatian Zeolite Association., 43-46.

Smiljanić D, Daković A, Spasojević M, Obradović M, Marković M, Langella A, de Gennaro B. Composites of phillipsite-rich tuff and surfactant – their characterization and stability. in 9th Croatian-Slovenian-Serbian Symposium on Zeolites. 2021;:43-46..

Smiljanić, Danijela, Daković, Aleksandra, Spasojević, Milica, Obradović, Milena, Marković, Marija, Langella, Alessio, de Gennaro, Bruno, "Composites of phillipsite-rich tuff and surfactant – their characterization and stability" in 9th Croatian-Slovenian-Serbian Symposium on Zeolites (2021):43-46.

TY  - CONF
AU  - Daković, Aleksandra
AU  - Obradović, Milena
AU  - Marković, Marija
AU  - Smiljanić, Danijela
AU  - Spasojević, Milica
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/730
AB  - Organobentonites are usually synthesized by intercalating various long chain organic cations (surfactants) into the interlayer space of bentonite by ion exchange with naturally occurring exchangeable cations. Presence of surfactants in the interlamellar space of bentonite changes its surface properties from hydrophilic to hydrophobic [1].
In this study, results on characterization of organobentonites obtained by treatment of Ca/Na bentonite with different amounts of surfactant – octadecyldimethylbenzyl ammonium chloride – ODMBA (10, 20, 30, 50 and 100 % of cation exchange capacity of Ca/Na bentonite) are presented. Organobentonites are denoted as OB-10, OB-20, OB-30, OB-50 and OB-100 [2]. Characterization of organobentonites were done by XRD [2] and thermal (DTA/TG) analyses. DTA curves as well as the data for mass loss from TG curves of Ca/Na bentonite and organobentonites are presented in the graphical abstract. DTA/TG analysis can be used to differentiate peaks associated with weight loss and those associated with phase transition and is widely used in the study of thermal reactions of the natural clay minerals (e.g. Ca/Na bentonite). These reactions include dehydration, dehydroxylation as well as transformation of the clay to a meta-phase and recrystallization of the meta-phase into a crystalline phase. The first two reactions are endothermic whereas the recrystallization of the meta-phase is exothermic [3]. In the DTA curves of the organobentonites, additional intensive exothermic peaks at temperatures >300ºC were observed representing oxidation of the organic matter present in the interlayer space of clay. The relative intensity of these exothermic peaks increase with increasing amounts of ODMBA in organobentonite. From mass loss, it can be seen that when organic cations are present in the interllamelar space of clay, mass loss in the first temperature region is lower confirming that treatment of Ca/Na bentonite with ODMBA ions increase hydrophobicity of the clay surface.
PB  - Kosovska Mitrovica : Fakultet Tehničkih nauka
C3  - Deseti simpozijum o termodinamici i faznim dijagramima
T1  - Thermal and XRD analysis in characterization of bentonite modified with different amounts of surfactant
EP  - 57
SP  - 56
ER  - 

@conference{
author = "Daković, Aleksandra and Obradović, Milena and Marković, Marija and Smiljanić, Danijela and Spasojević, Milica",
year = "2021",
abstract = "Organobentonites are usually synthesized by intercalating various long chain organic cations (surfactants) into the interlayer space of bentonite by ion exchange with naturally occurring exchangeable cations. Presence of surfactants in the interlamellar space of bentonite changes its surface properties from hydrophilic to hydrophobic [1].
In this study, results on characterization of organobentonites obtained by treatment of Ca/Na bentonite with different amounts of surfactant – octadecyldimethylbenzyl ammonium chloride – ODMBA (10, 20, 30, 50 and 100 % of cation exchange capacity of Ca/Na bentonite) are presented. Organobentonites are denoted as OB-10, OB-20, OB-30, OB-50 and OB-100 [2]. Characterization of organobentonites were done by XRD [2] and thermal (DTA/TG) analyses. DTA curves as well as the data for mass loss from TG curves of Ca/Na bentonite and organobentonites are presented in the graphical abstract. DTA/TG analysis can be used to differentiate peaks associated with weight loss and those associated with phase transition and is widely used in the study of thermal reactions of the natural clay minerals (e.g. Ca/Na bentonite). These reactions include dehydration, dehydroxylation as well as transformation of the clay to a meta-phase and recrystallization of the meta-phase into a crystalline phase. The first two reactions are endothermic whereas the recrystallization of the meta-phase is exothermic [3]. In the DTA curves of the organobentonites, additional intensive exothermic peaks at temperatures >300ºC were observed representing oxidation of the organic matter present in the interlayer space of clay. The relative intensity of these exothermic peaks increase with increasing amounts of ODMBA in organobentonite. From mass loss, it can be seen that when organic cations are present in the interllamelar space of clay, mass loss in the first temperature region is lower confirming that treatment of Ca/Na bentonite with ODMBA ions increase hydrophobicity of the clay surface.",
publisher = "Kosovska Mitrovica : Fakultet Tehničkih nauka",
journal = "Deseti simpozijum o termodinamici i faznim dijagramima",
title = "Thermal and XRD analysis in characterization of bentonite modified with different amounts of surfactant",
pages = "57-56"
}

Daković, A., Obradović, M., Marković, M., Smiljanić, D.,& Spasojević, M.. (2021). Thermal and XRD analysis in characterization of bentonite modified with different amounts of surfactant. in Deseti simpozijum o termodinamici i faznim dijagramima
Kosovska Mitrovica : Fakultet Tehničkih nauka., 56-57.

Daković A, Obradović M, Marković M, Smiljanić D, Spasojević M. Thermal and XRD analysis in characterization of bentonite modified with different amounts of surfactant. in Deseti simpozijum o termodinamici i faznim dijagramima. 2021;:56-57..

Daković, Aleksandra, Obradović, Milena, Marković, Marija, Smiljanić, Danijela, Spasojević, Milica, "Thermal and XRD analysis in characterization of bentonite modified with different amounts of surfactant" in Deseti simpozijum o termodinamici i faznim dijagramima (2021):56-57.

TY  - CONF
AU  - Obradović, Milena
AU  - Daković, Aleksandra
AU  - Rottinghaus, George E.
AU  - Spasojević, Milica
AU  - Marković, Marija
AU  - Smiljanić, Danijela
AU  - Krajišnik, Danina
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/729
AB  - In this paper, results of ibuprofen (IBU) adsorption by organokaolins obtained by modification of the natural kaolin (KR) with surfactant - hexadecyltrimethyl ammonium bromide (H) are presented. Two different amounts of surfactant were used for modification of KR (50 and 90% of kaolin’s cation exchange capacity). Samples are denoted as HKR-50 and HKR-90. Adsorption of IBU on organokaolins was investigated with different initial drug concentrations (2 – 20 mg/L) in phosphate buffer at pH 7. Compared with KR which has no affinity to adsorb IBU, modification of KR with H improved adsorption of this drug. Results showed that adsorption of IBU increased with increasing of the amount of surfactant in organokaolins as well as with increasing of the initial concentration of the drug in solution. Adsorption of IBU by both adsorbents followed nonlinear isotherms and from the Langmuir model, the maximum adsorption capacities were 2.05 mg/g for HKR-50 and 3.12 mg/g for HKR-90.
PB  - Belgrade : Society of Physical Chemists of Serbia
C3  - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Adsorption of ibuprofen by surfactant modified kaolin
EP  - 528
SP  - 525
ER  - 

@conference{
author = "Obradović, Milena and Daković, Aleksandra and Rottinghaus, George E. and Spasojević, Milica and Marković, Marija and Smiljanić, Danijela and Krajišnik, Danina",
year = "2021",
abstract = "In this paper, results of ibuprofen (IBU) adsorption by organokaolins obtained by modification of the natural kaolin (KR) with surfactant - hexadecyltrimethyl ammonium bromide (H) are presented. Two different amounts of surfactant were used for modification of KR (50 and 90% of kaolin’s cation exchange capacity). Samples are denoted as HKR-50 and HKR-90. Adsorption of IBU on organokaolins was investigated with different initial drug concentrations (2 – 20 mg/L) in phosphate buffer at pH 7. Compared with KR which has no affinity to adsorb IBU, modification of KR with H improved adsorption of this drug. Results showed that adsorption of IBU increased with increasing of the amount of surfactant in organokaolins as well as with increasing of the initial concentration of the drug in solution. Adsorption of IBU by both adsorbents followed nonlinear isotherms and from the Langmuir model, the maximum adsorption capacities were 2.05 mg/g for HKR-50 and 3.12 mg/g for HKR-90.",
publisher = "Belgrade : Society of Physical Chemists of Serbia",
journal = "15th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Adsorption of ibuprofen by surfactant modified kaolin",
pages = "528-525"
}

Obradović, M., Daković, A., Rottinghaus, G. E., Spasojević, M., Marković, M., Smiljanić, D.,& Krajišnik, D.. (2021). Adsorption of ibuprofen by surfactant modified kaolin. in 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Belgrade : Society of Physical Chemists of Serbia., 525-528.

Obradović M, Daković A, Rottinghaus GE, Spasojević M, Marković M, Smiljanić D, Krajišnik D. Adsorption of ibuprofen by surfactant modified kaolin. in 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2021;:525-528..

Obradović, Milena, Daković, Aleksandra, Rottinghaus, George E., Spasojević, Milica, Marković, Marija, Smiljanić, Danijela, Krajišnik, Danina, "Adsorption of ibuprofen by surfactant modified kaolin" in 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry (2021):525-528.

TY  - CONF
AU  - Marković, Marija
AU  - Daković, Aleksandra
AU  - Rottinghaus, George E.
AU  - Spasojević, Milica
AU  - Obradović, Milena
AU  - Smiljanić, Danijela
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/727
AB  - Cetylpyridinium chloride (CP) was used to modify the surface of the natural zeolite and adsorption
of two mycotoxins, ochratoxin A (OCHRA) and zearalenone (ZEN) was investigated. The
organozeolites were prepared with three different levels of CP (20, 50 and 100% of zeolite’s external
cation exchange capacity) and mycotoxin adsorption experiments were done at pH 3 and 7. Results
showed that with increasing amounts of CP at the zeolitic surface, adsorption of OCHRA and ZEN
increased, as well as with increasing amounts of solid phase in suspension. Adsorption of OCHRA
was dependent of the form of OCHRA in solution while ZEN adsorption was pH independent.
Maximum adsorption was obtained with the highest level of CP present at the zeolitic surface for
both mycotoxins.
PB  - Belgrade : Society of Physical Chemists of Serbia
C3  - 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry
T1  - Ochratoxin A and zearalenone adsorption by surfactant modified zeolite
EP  - 383
SP  - 380
ER  - 

@conference{
author = "Marković, Marija and Daković, Aleksandra and Rottinghaus, George E. and Spasojević, Milica and Obradović, Milena and Smiljanić, Danijela",
year = "2021",
abstract = "Cetylpyridinium chloride (CP) was used to modify the surface of the natural zeolite and adsorption
of two mycotoxins, ochratoxin A (OCHRA) and zearalenone (ZEN) was investigated. The
organozeolites were prepared with three different levels of CP (20, 50 and 100% of zeolite’s external
cation exchange capacity) and mycotoxin adsorption experiments were done at pH 3 and 7. Results
showed that with increasing amounts of CP at the zeolitic surface, adsorption of OCHRA and ZEN
increased, as well as with increasing amounts of solid phase in suspension. Adsorption of OCHRA
was dependent of the form of OCHRA in solution while ZEN adsorption was pH independent.
Maximum adsorption was obtained with the highest level of CP present at the zeolitic surface for
both mycotoxins.",
publisher = "Belgrade : Society of Physical Chemists of Serbia",
journal = "15th International Conference on Fundamental and Applied Aspects of Physical Chemistry",
title = "Ochratoxin A and zearalenone adsorption by surfactant modified zeolite",
pages = "383-380"
}

Marković, M., Daković, A., Rottinghaus, G. E., Spasojević, M., Obradović, M.,& Smiljanić, D.. (2021). Ochratoxin A and zearalenone adsorption by surfactant modified zeolite. in 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry
Belgrade : Society of Physical Chemists of Serbia., 380-383.

Marković M, Daković A, Rottinghaus GE, Spasojević M, Obradović M, Smiljanić D. Ochratoxin A and zearalenone adsorption by surfactant modified zeolite. in 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry. 2021;:380-383..

Marković, Marija, Daković, Aleksandra, Rottinghaus, George E., Spasojević, Milica, Obradović, Milena, Smiljanić, Danijela, "Ochratoxin A and zearalenone adsorption by surfactant modified zeolite" in 15th International Conference on Fundamental and Applied Aspects of Physical Chemistry (2021):380-383.

TY  - CONF
AU  - Ugrina, Marin
AU  - Čeru, Teja
AU  - Nuić, Ivona
AU  - Trgo, Marina
AU  - Daković, Aleksandra
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/732
AB  - Toxicity Characteristic Leaching Procedure (TCLP) was applied to mercury- contaminated soil from the Idrija region, Slovenia to evaluate the potential soil toxicity. The
TCLP test was performed with and without the addition of natural zeolite, iron(III)-modified
zeolite or sulphur-impregnated zeolite. Results showed that the soil is extremely polluted and
represents hazardous waste. The addition of zeolites significantly reduces the concentration of
leached Hg, whereby the most satisfactory results being achieved with sulphur-impregnated
zeolite, making it as a potential sorbent for in situ remediation of mercury-contaminated soil.
PB  - Zagreb : Croatian Zeolite Association
C3  - 9th Croatian-Slovenian-Serbian Symposium on Zeolites
T1  - Environmental-friendly modified natural zeolites as sorbents for in situ remediation of mercury-contaminated soil in Idria region, Slovenia
EP  - 102
SP  - 100
ER  - 

@conference{
author = "Ugrina, Marin and Čeru, Teja and Nuić, Ivona and Trgo, Marina and Daković, Aleksandra",
year = "2021",
abstract = "Toxicity Characteristic Leaching Procedure (TCLP) was applied to mercury- contaminated soil from the Idrija region, Slovenia to evaluate the potential soil toxicity. The
TCLP test was performed with and without the addition of natural zeolite, iron(III)-modified
zeolite or sulphur-impregnated zeolite. Results showed that the soil is extremely polluted and
represents hazardous waste. The addition of zeolites significantly reduces the concentration of
leached Hg, whereby the most satisfactory results being achieved with sulphur-impregnated
zeolite, making it as a potential sorbent for in situ remediation of mercury-contaminated soil.",
publisher = "Zagreb : Croatian Zeolite Association",
journal = "9th Croatian-Slovenian-Serbian Symposium on Zeolites",
title = "Environmental-friendly modified natural zeolites as sorbents for in situ remediation of mercury-contaminated soil in Idria region, Slovenia",
pages = "102-100"
}

Ugrina, M., Čeru, T., Nuić, I., Trgo, M.,& Daković, A.. (2021). Environmental-friendly modified natural zeolites as sorbents for in situ remediation of mercury-contaminated soil in Idria region, Slovenia. in 9th Croatian-Slovenian-Serbian Symposium on Zeolites
Zagreb : Croatian Zeolite Association., 100-102.

Ugrina M, Čeru T, Nuić I, Trgo M, Daković A. Environmental-friendly modified natural zeolites as sorbents for in situ remediation of mercury-contaminated soil in Idria region, Slovenia. in 9th Croatian-Slovenian-Serbian Symposium on Zeolites. 2021;:100-102..

Ugrina, Marin, Čeru, Teja, Nuić, Ivona, Trgo, Marina, Daković, Aleksandra, "Environmental-friendly modified natural zeolites as sorbents for in situ remediation of mercury-contaminated soil in Idria region, Slovenia" in 9th Croatian-Slovenian-Serbian Symposium on Zeolites (2021):100-102.

TY  - JOUR
AU  - Smiljanić, Danijela
AU  - de Gennaro, Bruno
AU  - Daković, Aleksandra
AU  - Galzerano, Barbara
AU  - Germinario, Chiara
AU  - Izzo, Francesco
AU  - Rottinghaus, George E.
AU  - Langella, Alessio
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/596
AB  - Composites of two natural zeolites ? clinoptilolite and phillipsite, and cationic surfactants (cetylpyridinium chloride and Arquad? 2HT-75) were tested for the removal of two emerging contaminants ? ibuprofen and naproxen. For each zeolite-rich rock, two different modifications of the zeolitic surfaces were prepared (monolayer and bilayer surfactant coverage). The influence of the initial drug concentrations and contact time on adsorption of these drugs was followed in buffer solution. The Langmuir model showed the highest adsorption capacity for the composite characterized by a bilayered surfactant at the clinoptilolite surface: 19.7 mg/g and 16.1 mg/g for ibuprofen and naproxen, respectively. Also, to simulate real systems, drug adsorption isotherms were conducted in natural water (Grindstone creek water ? Columbia, Missouri, USA) by using the best performing adsorbent; in this case, a slight decrease of drug adsorption was recorded. Kinetic runs were performed in distilled water as well as in the presence of ions such as sulfates and bicarbonates; also, in this case, the interfering agents defined an adsorption decrease for bilayer composites.
PB  - Academic Press Ltd- Elsevier Science Ltd, London
T2  - Journal of Environmental Management
T1  - Removal of non-steroidal anti-inflammatory drugs from water by zeolite-rich composites: The interference of inorganic anions on the ibuprofen and naproxen adsorption
VL  - 286
DO  - 10.1016/j.jenvman.2021.112168
UR  - conv_905
ER  - 

@article{
author = "Smiljanić, Danijela and de Gennaro, Bruno and Daković, Aleksandra and Galzerano, Barbara and Germinario, Chiara and Izzo, Francesco and Rottinghaus, George E. and Langella, Alessio",
year = "2021",
abstract = "Composites of two natural zeolites ? clinoptilolite and phillipsite, and cationic surfactants (cetylpyridinium chloride and Arquad? 2HT-75) were tested for the removal of two emerging contaminants ? ibuprofen and naproxen. For each zeolite-rich rock, two different modifications of the zeolitic surfaces were prepared (monolayer and bilayer surfactant coverage). The influence of the initial drug concentrations and contact time on adsorption of these drugs was followed in buffer solution. The Langmuir model showed the highest adsorption capacity for the composite characterized by a bilayered surfactant at the clinoptilolite surface: 19.7 mg/g and 16.1 mg/g for ibuprofen and naproxen, respectively. Also, to simulate real systems, drug adsorption isotherms were conducted in natural water (Grindstone creek water ? Columbia, Missouri, USA) by using the best performing adsorbent; in this case, a slight decrease of drug adsorption was recorded. Kinetic runs were performed in distilled water as well as in the presence of ions such as sulfates and bicarbonates; also, in this case, the interfering agents defined an adsorption decrease for bilayer composites.",
publisher = "Academic Press Ltd- Elsevier Science Ltd, London",
journal = "Journal of Environmental Management",
title = "Removal of non-steroidal anti-inflammatory drugs from water by zeolite-rich composites: The interference of inorganic anions on the ibuprofen and naproxen adsorption",
volume = "286",
doi = "10.1016/j.jenvman.2021.112168",
url = "conv_905"
}

Smiljanić, D., de Gennaro, B., Daković, A., Galzerano, B., Germinario, C., Izzo, F., Rottinghaus, G. E.,& Langella, A.. (2021). Removal of non-steroidal anti-inflammatory drugs from water by zeolite-rich composites: The interference of inorganic anions on the ibuprofen and naproxen adsorption. in Journal of Environmental Management
Academic Press Ltd- Elsevier Science Ltd, London., 286.
https://doi.org/10.1016/j.jenvman.2021.112168
conv_905

Smiljanić D, de Gennaro B, Daković A, Galzerano B, Germinario C, Izzo F, Rottinghaus GE, Langella A. Removal of non-steroidal anti-inflammatory drugs from water by zeolite-rich composites: The interference of inorganic anions on the ibuprofen and naproxen adsorption. in Journal of Environmental Management. 2021;286.
doi:10.1016/j.jenvman.2021.112168
conv_905 .

Smiljanić, Danijela, de Gennaro, Bruno, Daković, Aleksandra, Galzerano, Barbara, Germinario, Chiara, Izzo, Francesco, Rottinghaus, George E., Langella, Alessio, "Removal of non-steroidal anti-inflammatory drugs from water by zeolite-rich composites: The interference of inorganic anions on the ibuprofen and naproxen adsorption" in Journal of Environmental Management, 286 (2021),
https://doi.org/10.1016/j.jenvman.2021.112168 .,
conv_905 .

TY  - JOUR
AU  - Smiljanić, Danijela
AU  - Daković, Aleksandra
AU  - Obradović, Milena
AU  - Ožegović, Milica
AU  - Izzo, Francesco
AU  - Germinario, Chiara
AU  - de Gennaro, Bruno
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/579
AB  - This work aimed to test composites (surfactant modified zeolites prepared by treatment of natural zeolites-clinoptilolite (IZ CLI) and/or phillipsite (PHIL75)-rich tuffs with two different amounts of cationic surfactants: cetylpyridinium chloride (CPyCl) and Arquad(R) 2HT-75 (ARQ)) for the adsorption of salicylic acid (SA)-a common contaminant of emerging concern. Adsorption of SA was studied at different initial drug concentrations (in the range of 2-100 mg/L) in water solution. The Langmuir isotherm model showed the highest adsorption was achieved by bilayer composite of IZ CLI and CPyCl-around 11 mg/g. Kinetic runs were performed by using the initial drug concentration of 20 mg/L in the time interval from 0 to 75 min and pseudo-second order had good correlation with experimental data. The influence of the four different temperatures on the SA adsorption was also investigated and thermodynamic parameters suggested that the adsorption drug onto composites is an exothermic and nonspontaneous process, followed by the decrease of randomness at the solid/liquid interface during the adsorption. Zeta potential and Fourier-transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR) had been performed for the characterization of composites after adsorption of SA confirming the presence of the drug at composite surfaces.
PB  - MDPI, Basel
T2  - Materials
T1  - Application of Surfactant Modified Natural Zeolites for the Removal of Salicylic Acid-A Contaminant of Emerging Concern
IS  - 24
VL  - 14
DO  - 10.3390/ma14247728
UR  - conv_930
ER  - 

@article{
author = "Smiljanić, Danijela and Daković, Aleksandra and Obradović, Milena and Ožegović, Milica and Izzo, Francesco and Germinario, Chiara and de Gennaro, Bruno",
year = "2021",
abstract = "This work aimed to test composites (surfactant modified zeolites prepared by treatment of natural zeolites-clinoptilolite (IZ CLI) and/or phillipsite (PHIL75)-rich tuffs with two different amounts of cationic surfactants: cetylpyridinium chloride (CPyCl) and Arquad(R) 2HT-75 (ARQ)) for the adsorption of salicylic acid (SA)-a common contaminant of emerging concern. Adsorption of SA was studied at different initial drug concentrations (in the range of 2-100 mg/L) in water solution. The Langmuir isotherm model showed the highest adsorption was achieved by bilayer composite of IZ CLI and CPyCl-around 11 mg/g. Kinetic runs were performed by using the initial drug concentration of 20 mg/L in the time interval from 0 to 75 min and pseudo-second order had good correlation with experimental data. The influence of the four different temperatures on the SA adsorption was also investigated and thermodynamic parameters suggested that the adsorption drug onto composites is an exothermic and nonspontaneous process, followed by the decrease of randomness at the solid/liquid interface during the adsorption. Zeta potential and Fourier-transform infrared spectroscopy with attenuated total reflectance (FTIR-ATR) had been performed for the characterization of composites after adsorption of SA confirming the presence of the drug at composite surfaces.",
publisher = "MDPI, Basel",
journal = "Materials",
title = "Application of Surfactant Modified Natural Zeolites for the Removal of Salicylic Acid-A Contaminant of Emerging Concern",
number = "24",
volume = "14",
doi = "10.3390/ma14247728",
url = "conv_930"
}

Smiljanić, D., Daković, A., Obradović, M., Ožegović, M., Izzo, F., Germinario, C.,& de Gennaro, B.. (2021). Application of Surfactant Modified Natural Zeolites for the Removal of Salicylic Acid-A Contaminant of Emerging Concern. in Materials
MDPI, Basel., 14(24).
https://doi.org/10.3390/ma14247728
conv_930

Smiljanić D, Daković A, Obradović M, Ožegović M, Izzo F, Germinario C, de Gennaro B. Application of Surfactant Modified Natural Zeolites for the Removal of Salicylic Acid-A Contaminant of Emerging Concern. in Materials. 2021;14(24).
doi:10.3390/ma14247728
conv_930 .

Smiljanić, Danijela, Daković, Aleksandra, Obradović, Milena, Ožegović, Milica, Izzo, Francesco, Germinario, Chiara, de Gennaro, Bruno, "Application of Surfactant Modified Natural Zeolites for the Removal of Salicylic Acid-A Contaminant of Emerging Concern" in Materials, 14, no. 24 (2021),
https://doi.org/10.3390/ma14247728 .,
conv_930 .

TY  - JOUR
AU  - Ugrina, Marin
AU  - Gabersek, Martin
AU  - Daković, Aleksandra
AU  - Nuić, Ivona
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/593
AB  - Sulfur-impregnated zeolite has been obtained from the natural zeolite clinoptilolite by chemical modification with Na2S at 150 degrees C. The purpose of zeolite impregnation was to enhance the sorption of Hg(II) from aqueous solutions. Chemical analysis, acid and basic properties determined by Bohem's method, chemical behavior at different pH(o) values, zeta potential, cation-exchange capacity (CEC), specific surface area, X-ray powder diffraction (XRPD), scanning electron microscopy with energy-dispersive X-ray analysis (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), as well as thermogravimetry with derivative thermogravimetry (TG-DTG) were used for detailed comparative mineralogical and physico-chemical characterization of natural and sulfur-impregnated zeolites. Results revealed that the surface of the natural zeolite was successfully impregnated with sulfur species in the form of FeS and CaS. Chemical modification caused an increase in basicity and the net negative surface charge due to an increase in oxygen-containing functional groups as well as a decrease in specific surface area and crystallinity due to the formation of sulfur-containing clusters at the zeolite surface. The sorption of Hg(II) species onto the sulfur-impregnated zeolite was affected by the pH, solid/liquid ratio, initial Hg(II) concentration, and contact time. The optimal sorption conditions were determined as pH 2, a solid/liquid ratio of 10 g/L, and a contact time of 800 min. The maximum obtained sorption capacity of the sulfur-impregnated zeolite toward Hg(II) was 1.02 mmol/g. The sorption mechanism of Hg(II) onto the sulfur-impregnated zeolite involves electrostatic attraction, ion exchange, and surface complexation, accompanied by co-precipitation of Hg(II) in the form of HgS. It was found that sulfur-impregnation enhanced the sorption of Hg(II) by 3.6 times compared to the natural zeolite. The leaching test indicated the retention of Hg(II) in the zeolite structure over a wide pH range, making this sulfur-impregnated sorbent a promising material for the remediation of a mercury-polluted environment.
PB  - MDPI, Basel
T2  - Processes
T1  - Preparation and Characterization of the Sulfur-Impregnated Natural Zeolite Clinoptilolite for Hg(II) Removal from Aqueous Solutions
IS  - 2
VL  - 9
DO  - 10.3390/pr9020217
UR  - conv_902
ER  - 

@article{
author = "Ugrina, Marin and Gabersek, Martin and Daković, Aleksandra and Nuić, Ivona",
year = "2021",
abstract = "Sulfur-impregnated zeolite has been obtained from the natural zeolite clinoptilolite by chemical modification with Na2S at 150 degrees C. The purpose of zeolite impregnation was to enhance the sorption of Hg(II) from aqueous solutions. Chemical analysis, acid and basic properties determined by Bohem's method, chemical behavior at different pH(o) values, zeta potential, cation-exchange capacity (CEC), specific surface area, X-ray powder diffraction (XRPD), scanning electron microscopy with energy-dispersive X-ray analysis (SEM-EDS), Fourier transform infrared spectroscopy (FTIR), as well as thermogravimetry with derivative thermogravimetry (TG-DTG) were used for detailed comparative mineralogical and physico-chemical characterization of natural and sulfur-impregnated zeolites. Results revealed that the surface of the natural zeolite was successfully impregnated with sulfur species in the form of FeS and CaS. Chemical modification caused an increase in basicity and the net negative surface charge due to an increase in oxygen-containing functional groups as well as a decrease in specific surface area and crystallinity due to the formation of sulfur-containing clusters at the zeolite surface. The sorption of Hg(II) species onto the sulfur-impregnated zeolite was affected by the pH, solid/liquid ratio, initial Hg(II) concentration, and contact time. The optimal sorption conditions were determined as pH 2, a solid/liquid ratio of 10 g/L, and a contact time of 800 min. The maximum obtained sorption capacity of the sulfur-impregnated zeolite toward Hg(II) was 1.02 mmol/g. The sorption mechanism of Hg(II) onto the sulfur-impregnated zeolite involves electrostatic attraction, ion exchange, and surface complexation, accompanied by co-precipitation of Hg(II) in the form of HgS. It was found that sulfur-impregnation enhanced the sorption of Hg(II) by 3.6 times compared to the natural zeolite. The leaching test indicated the retention of Hg(II) in the zeolite structure over a wide pH range, making this sulfur-impregnated sorbent a promising material for the remediation of a mercury-polluted environment.",
publisher = "MDPI, Basel",
journal = "Processes",
title = "Preparation and Characterization of the Sulfur-Impregnated Natural Zeolite Clinoptilolite for Hg(II) Removal from Aqueous Solutions",
number = "2",
volume = "9",
doi = "10.3390/pr9020217",
url = "conv_902"
}

Ugrina, M., Gabersek, M., Daković, A.,& Nuić, I.. (2021). Preparation and Characterization of the Sulfur-Impregnated Natural Zeolite Clinoptilolite for Hg(II) Removal from Aqueous Solutions. in Processes
MDPI, Basel., 9(2).
https://doi.org/10.3390/pr9020217
conv_902

Ugrina M, Gabersek M, Daković A, Nuić I. Preparation and Characterization of the Sulfur-Impregnated Natural Zeolite Clinoptilolite for Hg(II) Removal from Aqueous Solutions. in Processes. 2021;9(2).
doi:10.3390/pr9020217
conv_902 .

Ugrina, Marin, Gabersek, Martin, Daković, Aleksandra, Nuić, Ivona, "Preparation and Characterization of the Sulfur-Impregnated Natural Zeolite Clinoptilolite for Hg(II) Removal from Aqueous Solutions" in Processes, 9, no. 2 (2021),
https://doi.org/10.3390/pr9020217 .,
conv_902 .

TY  - JOUR
AU  - Jauković, Valentina
AU  - Krajišnik, Danina
AU  - Daković, Aleksandra
AU  - Damjanović, Ana
AU  - Krstić, Jugoslav
AU  - Stojanović, Jovica
AU  - Calija, Bojan
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/598
AB  - The functionality of halloysite (Hal) nanotubes as drug carriers can be improved by lumen enlargement and polymer modification. This study investigates the influence of selective acid etching on Hal functionalization with cationic biopolymer chitosan. Hal was subjected to lumen etching under mild conditions, loaded under vacuum with nonsteroidal antiinflammatory drug aceclofenac, and incubated in an acidic solution of chitosan. The functionality of pristine and etched Hal before and upon polymer functionalization was assessed by ?-potential measurements, structural characterization (FT-IR, DSC and XRPD analysis), cell viability assay, drug loading and drug release studies. Acid etching increased specific surface area, pore volume and pore size of Hal, decreased ?-potential and facilitated binding of the cationic polymer. XRPD and DSC analysis revealed crystalline structure of etched Hal. Successful chitosan binding and drug entrapment were further confirmed by FT-IR and DSC studies. XRPD showed surface polymer binding. DSC and FT-IR analyses confirmed the presence of the entrapped drug in its crystalline form. Drug loading was increased for ?81% by selective lumen etching. Slight decrease of drug content occurred during chitosan functionalization due to aceclofenac diffusion in the polymer solution. The drug release was more sustained from etched Hal nanocomposites (up to ?87% for 12 h) than from pristine Hal (up to ?97% for 12 h) due to more intensive chitosan binding. High human fibroblast survival rates upon exposure to pristine and etched Hal before and after chitosan functionalization (>90% in the concentration of 1000 ?g/mL) confirmed that both lumen etching under mild conditions and polymer functionalization had no significant effect on cytocompatibility. Based on these findings, selective lumen etching in combination with polycation modification appears to be a promising approach for improvement of Hal nanotubes functionality by increasing payload, polymer binding capacity, and sustained release properties with no significant effect on their cytocompatibility.
PB  - Elsevier, Amsterdam
T2  - Materials Science & Engineering C-Materials for Biological Applications
T1  - Influence of selective acid-etching on functionality of halloysite-chitosan nanocontainers for sustained drug release
VL  - 123
DO  - 10.1016/j.msec.2021.112029
UR  - conv_907
ER  - 

@article{
author = "Jauković, Valentina and Krajišnik, Danina and Daković, Aleksandra and Damjanović, Ana and Krstić, Jugoslav and Stojanović, Jovica and Calija, Bojan",
year = "2021",
abstract = "The functionality of halloysite (Hal) nanotubes as drug carriers can be improved by lumen enlargement and polymer modification. This study investigates the influence of selective acid etching on Hal functionalization with cationic biopolymer chitosan. Hal was subjected to lumen etching under mild conditions, loaded under vacuum with nonsteroidal antiinflammatory drug aceclofenac, and incubated in an acidic solution of chitosan. The functionality of pristine and etched Hal before and upon polymer functionalization was assessed by ?-potential measurements, structural characterization (FT-IR, DSC and XRPD analysis), cell viability assay, drug loading and drug release studies. Acid etching increased specific surface area, pore volume and pore size of Hal, decreased ?-potential and facilitated binding of the cationic polymer. XRPD and DSC analysis revealed crystalline structure of etched Hal. Successful chitosan binding and drug entrapment were further confirmed by FT-IR and DSC studies. XRPD showed surface polymer binding. DSC and FT-IR analyses confirmed the presence of the entrapped drug in its crystalline form. Drug loading was increased for ?81% by selective lumen etching. Slight decrease of drug content occurred during chitosan functionalization due to aceclofenac diffusion in the polymer solution. The drug release was more sustained from etched Hal nanocomposites (up to ?87% for 12 h) than from pristine Hal (up to ?97% for 12 h) due to more intensive chitosan binding. High human fibroblast survival rates upon exposure to pristine and etched Hal before and after chitosan functionalization (>90% in the concentration of 1000 ?g/mL) confirmed that both lumen etching under mild conditions and polymer functionalization had no significant effect on cytocompatibility. Based on these findings, selective lumen etching in combination with polycation modification appears to be a promising approach for improvement of Hal nanotubes functionality by increasing payload, polymer binding capacity, and sustained release properties with no significant effect on their cytocompatibility.",
publisher = "Elsevier, Amsterdam",
journal = "Materials Science & Engineering C-Materials for Biological Applications",
title = "Influence of selective acid-etching on functionality of halloysite-chitosan nanocontainers for sustained drug release",
volume = "123",
doi = "10.1016/j.msec.2021.112029",
url = "conv_907"
}

Jauković, V., Krajišnik, D., Daković, A., Damjanović, A., Krstić, J., Stojanović, J.,& Calija, B.. (2021). Influence of selective acid-etching on functionality of halloysite-chitosan nanocontainers for sustained drug release. in Materials Science & Engineering C-Materials for Biological Applications
Elsevier, Amsterdam., 123.
https://doi.org/10.1016/j.msec.2021.112029
conv_907

Jauković V, Krajišnik D, Daković A, Damjanović A, Krstić J, Stojanović J, Calija B. Influence of selective acid-etching on functionality of halloysite-chitosan nanocontainers for sustained drug release. in Materials Science & Engineering C-Materials for Biological Applications. 2021;123.
doi:10.1016/j.msec.2021.112029
conv_907 .

Jauković, Valentina, Krajišnik, Danina, Daković, Aleksandra, Damjanović, Ana, Krstić, Jugoslav, Stojanović, Jovica, Calija, Bojan, "Influence of selective acid-etching on functionality of halloysite-chitosan nanocontainers for sustained drug release" in Materials Science & Engineering C-Materials for Biological Applications, 123 (2021),
https://doi.org/10.1016/j.msec.2021.112029 .,
conv_907 .

TY  - JOUR
AU  - Spasojević, Milica
AU  - Daković, Aleksandra
AU  - Rottinghaus, George E.
AU  - Obradović, Milena
AU  - Krajišnik, Danina
AU  - Marković, Marija
AU  - Krstić, Jugoslav
PY  - 2021
UR  - https://ritnms.itnms.ac.rs/handle/123456789/573
AB  - A natural kaolin from Serbia was modified with different amounts of octadecyldimethylbenzyl ammonium (ODMBA) - (25, 50 and 90% of kaolin cation exchange capacity). Samples were denoted as OKR-25, OKR-50 and OKR-90. Several methods (FTIR spectroscopy, thermal analysis, zeta potential measurements, and N2 physisorption) were used for characterization of the organokaolinites. Adsorption of the common mycotoxins ochratoxin A (OCHRA) and zearalenone (ZEN) by the organokaolinites was investigated at different levels of solid phase in suspension, different initial mycotoxin concentrations and different pH values. The natural kaolin was not effective in binding OCHRA or ZEN. Adsorption of both mycotoxins by organokaolinites increased with increasing amounts of solid phase as well as with increasing levels of surfactant on the kaolin surface. OCHRA and ZEN adsorption by all organokaolinites followed non-linear adsorption isotherms, at pH 3, 7 and 9. The maximum adsorption capacity for OCHRA adsorption was at pH 3 (4.8 mg/g for OKR-25, 26.7 mg/g for OKR-50 and 39.2 mg/g for OKR-90) that was calculated from the Langmuir model. Much lower OCHRA adsorption capacities were found at pH 7 and 9 (from 0.8 mg/g to 6.9 mg/g at pH 7 and from 1.1 mg/g to 4.6 mg/g at pH 9). The following adsorption capacities for ZEN were obtained from the Langmuir isotherms, at pH 3: 4.5 mg/g for OKR-25, 12.0 mg/g for OKR-50 and 13.5 mg/g for OKR-90. At pH 7, adsorption of ZEN was 5.7 mg/g for OKR25, 15.3 mg/g for OKR-90 and 14. 4 mg/g for OKR-90. At pH 9, ZEN adsorption capacities were 2.4, 14.1 and 8.1 mg/g for OKR-25, OKR-50 and OKR-90, respectively. Thus, at the lowest amount of ODMBA at the kaolin surface, adsorption of ZEN was similar at pH 3 and 7, while a slightly lower value was obtained for its adsorption at pH 9. With increasing amounts of organic phase at the kaolin surface, the adsorption of ZEN was practically independent of pH. Adsorption of both mycotoxins was dependent on the amount of ODMBA ions at the kaolin surface as well as on their forms in solution.
PB  - Elsevier, Amsterdam
T2  - Applied Clay Science
T1  - Influence of surface coverage of kaolin with surfactant ions on adsorption of ochratoxin A and zearalenone
VL  - 205
DO  - 10.1016/j.clay.2021.106040
UR  - conv_909
ER  - 

@article{
author = "Spasojević, Milica and Daković, Aleksandra and Rottinghaus, George E. and Obradović, Milena and Krajišnik, Danina and Marković, Marija and Krstić, Jugoslav",
year = "2021",
abstract = "A natural kaolin from Serbia was modified with different amounts of octadecyldimethylbenzyl ammonium (ODMBA) - (25, 50 and 90% of kaolin cation exchange capacity). Samples were denoted as OKR-25, OKR-50 and OKR-90. Several methods (FTIR spectroscopy, thermal analysis, zeta potential measurements, and N2 physisorption) were used for characterization of the organokaolinites. Adsorption of the common mycotoxins ochratoxin A (OCHRA) and zearalenone (ZEN) by the organokaolinites was investigated at different levels of solid phase in suspension, different initial mycotoxin concentrations and different pH values. The natural kaolin was not effective in binding OCHRA or ZEN. Adsorption of both mycotoxins by organokaolinites increased with increasing amounts of solid phase as well as with increasing levels of surfactant on the kaolin surface. OCHRA and ZEN adsorption by all organokaolinites followed non-linear adsorption isotherms, at pH 3, 7 and 9. The maximum adsorption capacity for OCHRA adsorption was at pH 3 (4.8 mg/g for OKR-25, 26.7 mg/g for OKR-50 and 39.2 mg/g for OKR-90) that was calculated from the Langmuir model. Much lower OCHRA adsorption capacities were found at pH 7 and 9 (from 0.8 mg/g to 6.9 mg/g at pH 7 and from 1.1 mg/g to 4.6 mg/g at pH 9). The following adsorption capacities for ZEN were obtained from the Langmuir isotherms, at pH 3: 4.5 mg/g for OKR-25, 12.0 mg/g for OKR-50 and 13.5 mg/g for OKR-90. At pH 7, adsorption of ZEN was 5.7 mg/g for OKR25, 15.3 mg/g for OKR-90 and 14. 4 mg/g for OKR-90. At pH 9, ZEN adsorption capacities were 2.4, 14.1 and 8.1 mg/g for OKR-25, OKR-50 and OKR-90, respectively. Thus, at the lowest amount of ODMBA at the kaolin surface, adsorption of ZEN was similar at pH 3 and 7, while a slightly lower value was obtained for its adsorption at pH 9. With increasing amounts of organic phase at the kaolin surface, the adsorption of ZEN was practically independent of pH. Adsorption of both mycotoxins was dependent on the amount of ODMBA ions at the kaolin surface as well as on their forms in solution.",
publisher = "Elsevier, Amsterdam",
journal = "Applied Clay Science",
title = "Influence of surface coverage of kaolin with surfactant ions on adsorption of ochratoxin A and zearalenone",
volume = "205",
doi = "10.1016/j.clay.2021.106040",
url = "conv_909"
}

Spasojević, M., Daković, A., Rottinghaus, G. E., Obradović, M., Krajišnik, D., Marković, M.,& Krstić, J.. (2021). Influence of surface coverage of kaolin with surfactant ions on adsorption of ochratoxin A and zearalenone. in Applied Clay Science
Elsevier, Amsterdam., 205.
https://doi.org/10.1016/j.clay.2021.106040
conv_909

Spasojević M, Daković A, Rottinghaus GE, Obradović M, Krajišnik D, Marković M, Krstić J. Influence of surface coverage of kaolin with surfactant ions on adsorption of ochratoxin A and zearalenone. in Applied Clay Science. 2021;205.
doi:10.1016/j.clay.2021.106040
conv_909 .

Spasojević, Milica, Daković, Aleksandra, Rottinghaus, George E., Obradović, Milena, Krajišnik, Danina, Marković, Marija, Krstić, Jugoslav, "Influence of surface coverage of kaolin with surfactant ions on adsorption of ochratoxin A and zearalenone" in Applied Clay Science, 205 (2021),
https://doi.org/10.1016/j.clay.2021.106040 .,
conv_909 .

TY  - JOUR
AU  - Smiljanić, Danijela
AU  - de Gennaro, Bruno
AU  - Izzo, Francesco
AU  - Langella, Alessio
AU  - Daković, Aleksandra
AU  - Germinario, Chiara
AU  - Rottinghaus, George E.
AU  - Spasojević, Milica
AU  - Mercurio, Mariano
PY  - 2020
UR  - https://ritnms.itnms.ac.rs/handle/123456789/556
AB  - In this study, composites of the natural zeolites and cationic surfactants cetylpyridinium chloride and Arquad (R) 2HT-75 were used for removal of two emerging contaminants - diclofenac sodium and ketopmfen. Modifying a clinoptilolite- and a phillipsite-rich tuff, with surfactants with one or two hydrophobic tails, resulted in composites in monolayer and bilayer forms. The intention was to better evaluate interactions of composites with selected molecules. Starting materials and composites were characterized by ATR-FTIR and STA coupled with EGA. The adsorption capacities of the prepared sorbents were estimated by determination of adsorption isotherms and kinetic runs. Maximum adsorption capacity, obtained from the Langmuir model, showed that the best results were for the bilayer form of the composites up to 35 mg/g. Between the two surfactants, composites with cetylpyridinium chloride gave better results. Zeta potential measurements showed that the surfactants turned out to be unstable on the zeolite surface, the only exception being bilayers prepared using the two-tailed surfactant Arquad (R) 2HT-75. These results suggested possible applications of these composites for water treatment purposes.
PB  - Elsevier, Amsterdam
T2  - Microporous and Mesoporous Materials
T1  - Removal of emerging contaminants from water by zeolite-rich composites: A first approach aiming at diclofenac and ketoprofen
VL  - 298
DO  - 10.1016/j.micromeso.2020.110057
UR  - conv_879
ER  - 

@article{
author = "Smiljanić, Danijela and de Gennaro, Bruno and Izzo, Francesco and Langella, Alessio and Daković, Aleksandra and Germinario, Chiara and Rottinghaus, George E. and Spasojević, Milica and Mercurio, Mariano",
year = "2020",
abstract = "In this study, composites of the natural zeolites and cationic surfactants cetylpyridinium chloride and Arquad (R) 2HT-75 were used for removal of two emerging contaminants - diclofenac sodium and ketopmfen. Modifying a clinoptilolite- and a phillipsite-rich tuff, with surfactants with one or two hydrophobic tails, resulted in composites in monolayer and bilayer forms. The intention was to better evaluate interactions of composites with selected molecules. Starting materials and composites were characterized by ATR-FTIR and STA coupled with EGA. The adsorption capacities of the prepared sorbents were estimated by determination of adsorption isotherms and kinetic runs. Maximum adsorption capacity, obtained from the Langmuir model, showed that the best results were for the bilayer form of the composites up to 35 mg/g. Between the two surfactants, composites with cetylpyridinium chloride gave better results. Zeta potential measurements showed that the surfactants turned out to be unstable on the zeolite surface, the only exception being bilayers prepared using the two-tailed surfactant Arquad (R) 2HT-75. These results suggested possible applications of these composites for water treatment purposes.",
publisher = "Elsevier, Amsterdam",
journal = "Microporous and Mesoporous Materials",
title = "Removal of emerging contaminants from water by zeolite-rich composites: A first approach aiming at diclofenac and ketoprofen",
volume = "298",
doi = "10.1016/j.micromeso.2020.110057",
url = "conv_879"
}

Smiljanić, D., de Gennaro, B., Izzo, F., Langella, A., Daković, A., Germinario, C., Rottinghaus, G. E., Spasojević, M.,& Mercurio, M.. (2020). Removal of emerging contaminants from water by zeolite-rich composites: A first approach aiming at diclofenac and ketoprofen. in Microporous and Mesoporous Materials
Elsevier, Amsterdam., 298.
https://doi.org/10.1016/j.micromeso.2020.110057
conv_879

Smiljanić D, de Gennaro B, Izzo F, Langella A, Daković A, Germinario C, Rottinghaus GE, Spasojević M, Mercurio M. Removal of emerging contaminants from water by zeolite-rich composites: A first approach aiming at diclofenac and ketoprofen. in Microporous and Mesoporous Materials. 2020;298.
doi:10.1016/j.micromeso.2020.110057
conv_879 .

Smiljanić, Danijela, de Gennaro, Bruno, Izzo, Francesco, Langella, Alessio, Daković, Aleksandra, Germinario, Chiara, Rottinghaus, George E., Spasojević, Milica, Mercurio, Mariano, "Removal of emerging contaminants from water by zeolite-rich composites: A first approach aiming at diclofenac and ketoprofen" in Microporous and Mesoporous Materials, 298 (2020),
https://doi.org/10.1016/j.micromeso.2020.110057 .,
conv_879 .

TY  - JOUR
AU  - Calija, Bojan
AU  - Milić, Jela
AU  - Milasinović, Nikola
AU  - Daković, Aleksandra
AU  - Trifković, Kata
AU  - Stojanović, Jovica
AU  - Krajišnik, Danina
PY  - 2020
UR  - https://ritnms.itnms.ac.rs/handle/123456789/550
AB  - This study was designed to investigate functionality of tetracycline-loaded chitosan-halloysite nanocomposite films, with focus on evaluating the influence of chitosan molar mass on films applicability for sustained local antibiotic delivery. The films were prepared by casting and solvent evaporation using low, medium, and high molar mass chitosan. SEM analysis revealed compact, nonporous and rough surface of the nanocomposite films due to the presence of halloysite agglomerates and tetracycline crystals. Increasing chitosan molar mass led to higher values of elongation at break (from 21.65 +/- 2.65 to 34.48 +/- 2.34%), tensile strength (from 134.8 +/- 13.21 to 246.36 +/- 14.69 MPa), and elastic modulus (from 633.79 +/- 128.37 to 716.55 +/- 60.76 MPa) of the nanocomposite films. FT-IR, XRPD, and thermal analyses confirmed molar mass dependent chitosan-halloysite interactions and improved thermal stability of the nanocomposite films in comparison with chitosan films. The nanocomposite films released tetracycline in a sustained manner, with the slowest release achieved from the films consisting of low molar mass chitosan. Chitosan molar mass was confirmed to be a functionality-related characteristic of chitosan-halloysite nanocomposite films as potential sustained-release carriers for topical delivery of antibiotics.
PB  - Wiley, Hoboken
T2  - Journal of Applied Polymer Science
T1  - Functionality of chitosan-halloysite nanocomposite films for sustained delivery of antibiotics: The effect of chitosan molar mass
IS  - 8
VL  - 137
DO  - 10.1002/app.48406
UR  - conv_858
ER  - 

@article{
author = "Calija, Bojan and Milić, Jela and Milasinović, Nikola and Daković, Aleksandra and Trifković, Kata and Stojanović, Jovica and Krajišnik, Danina",
year = "2020",
abstract = "This study was designed to investigate functionality of tetracycline-loaded chitosan-halloysite nanocomposite films, with focus on evaluating the influence of chitosan molar mass on films applicability for sustained local antibiotic delivery. The films were prepared by casting and solvent evaporation using low, medium, and high molar mass chitosan. SEM analysis revealed compact, nonporous and rough surface of the nanocomposite films due to the presence of halloysite agglomerates and tetracycline crystals. Increasing chitosan molar mass led to higher values of elongation at break (from 21.65 +/- 2.65 to 34.48 +/- 2.34%), tensile strength (from 134.8 +/- 13.21 to 246.36 +/- 14.69 MPa), and elastic modulus (from 633.79 +/- 128.37 to 716.55 +/- 60.76 MPa) of the nanocomposite films. FT-IR, XRPD, and thermal analyses confirmed molar mass dependent chitosan-halloysite interactions and improved thermal stability of the nanocomposite films in comparison with chitosan films. The nanocomposite films released tetracycline in a sustained manner, with the slowest release achieved from the films consisting of low molar mass chitosan. Chitosan molar mass was confirmed to be a functionality-related characteristic of chitosan-halloysite nanocomposite films as potential sustained-release carriers for topical delivery of antibiotics.",
publisher = "Wiley, Hoboken",
journal = "Journal of Applied Polymer Science",
title = "Functionality of chitosan-halloysite nanocomposite films for sustained delivery of antibiotics: The effect of chitosan molar mass",
number = "8",
volume = "137",
doi = "10.1002/app.48406",
url = "conv_858"
}

Calija, B., Milić, J., Milasinović, N., Daković, A., Trifković, K., Stojanović, J.,& Krajišnik, D.. (2020). Functionality of chitosan-halloysite nanocomposite films for sustained delivery of antibiotics: The effect of chitosan molar mass. in Journal of Applied Polymer Science
Wiley, Hoboken., 137(8).
https://doi.org/10.1002/app.48406
conv_858

Calija B, Milić J, Milasinović N, Daković A, Trifković K, Stojanović J, Krajišnik D. Functionality of chitosan-halloysite nanocomposite films for sustained delivery of antibiotics: The effect of chitosan molar mass. in Journal of Applied Polymer Science. 2020;137(8).
doi:10.1002/app.48406
conv_858 .

Calija, Bojan, Milić, Jela, Milasinović, Nikola, Daković, Aleksandra, Trifković, Kata, Stojanović, Jovica, Krajišnik, Danina, "Functionality of chitosan-halloysite nanocomposite films for sustained delivery of antibiotics: The effect of chitosan molar mass" in Journal of Applied Polymer Science, 137, no. 8 (2020),
https://doi.org/10.1002/app.48406 .,
conv_858 .

TY  - CONF
AU  - Daković, Aleksandra
AU  - Spasojević, Milica
PY  - 2019
UR  - https://ritnms.itnms.ac.rs/handle/123456789/741
AB  - The natural kaolin from a plant for the production of quartz sand in Rgotina, Serbia (KR) was modified with two cationic surfactants - octadecyl dimethyl benzyl ammonium chloride (O) and hexadecyltrimethylammonium bromide (H). Both surfactants were added in amounts equal to 90% of kaolin cation exchange capacity (CEC). The obtained materials were denoted as OKR and HKR. Characterizations of KR, OKR, and HKR were done by Fourier transform infrared spectroscopy (FTIR) spectroscopy and zeta potential measurements. FTIR spectra and zeta potential measurements confirmed the presence of both surfactants at the kaolin surface. 
Adsorption of mycotoxins – zearalenone (ZEN) and ochratoxin A (OCHRA) was studied by the natural kaolin and organokaolines under in vitro conditions. The effects of the amount of the adsorbent, the initial ZEN and OCHRA concentrations, and pH, on adsorption of mycotoxins, were investigated. Preliminary results of adsorption of ZEN and OCHRA by KR showed that natural kaolin had no affinity to adsorb these mycotoxins. However, the presence of both organic cations in the kaolin structure significantly increased adsorption of ZEN and OCHRA. Adsorption of the mycotoxins by OKR and HKR increased with increasing the amount of each adsorbent in suspension. Slightly higher adsorption of ZEN than OCHRA by both adsorbents was observed at both pHs. 
ZEN and OCHRA adsorption increased for both OKR and HKR as the concentration of the initial toxins increased at pH 3 and 7. OCHRA and ZEN are hydrophobic molecules that possess different functional groups and may exist in various forms at different pH values. OCHRA adsorption by OKR and HKR followed nonlinear isotherms at pH 3 and 7, and higher adsorption capacity was obtained for OKR. Also, OCHRA adsorption capacity for OKR and HKR was much higher at pH 3. The obtained results suggest that adsorption of OCHRA was dependent on the form of OCHRA in solution and that type of surfactant had an influence on OCHRA adsorption. Adsorption of ZEN by organokaolines also showed nonlinear isotherms at pH 3 and 7 and similar amounts were adsorbed at both adsorbents at both pH values. The obtained adsorption capacities suggest that adsorption of ZEN was practically independent of the form of the toxin in solution and also on the type of the organic cations in the kaolin structure. Based on the obtained results, kaolin modified with surfactants may be effective materials for adsorption of ZEN and OCHRA.
PB  - Belgrade : Association of Metallurgical Engineers of Serbia
C3  - Metallurgical & Materials Engineering Congress of South-East Europe
T1  - Cationic surfactants modified kaolin – Efficient adsorbents for mycotoxins
EP  - 12
SP  - 12
ER  - 

@conference{
author = "Daković, Aleksandra and Spasojević, Milica",
year = "2019",
abstract = "The natural kaolin from a plant for the production of quartz sand in Rgotina, Serbia (KR) was modified with two cationic surfactants - octadecyl dimethyl benzyl ammonium chloride (O) and hexadecyltrimethylammonium bromide (H). Both surfactants were added in amounts equal to 90% of kaolin cation exchange capacity (CEC). The obtained materials were denoted as OKR and HKR. Characterizations of KR, OKR, and HKR were done by Fourier transform infrared spectroscopy (FTIR) spectroscopy and zeta potential measurements. FTIR spectra and zeta potential measurements confirmed the presence of both surfactants at the kaolin surface. 
Adsorption of mycotoxins – zearalenone (ZEN) and ochratoxin A (OCHRA) was studied by the natural kaolin and organokaolines under in vitro conditions. The effects of the amount of the adsorbent, the initial ZEN and OCHRA concentrations, and pH, on adsorption of mycotoxins, were investigated. Preliminary results of adsorption of ZEN and OCHRA by KR showed that natural kaolin had no affinity to adsorb these mycotoxins. However, the presence of both organic cations in the kaolin structure significantly increased adsorption of ZEN and OCHRA. Adsorption of the mycotoxins by OKR and HKR increased with increasing the amount of each adsorbent in suspension. Slightly higher adsorption of ZEN than OCHRA by both adsorbents was observed at both pHs. 
ZEN and OCHRA adsorption increased for both OKR and HKR as the concentration of the initial toxins increased at pH 3 and 7. OCHRA and ZEN are hydrophobic molecules that possess different functional groups and may exist in various forms at different pH values. OCHRA adsorption by OKR and HKR followed nonlinear isotherms at pH 3 and 7, and higher adsorption capacity was obtained for OKR. Also, OCHRA adsorption capacity for OKR and HKR was much higher at pH 3. The obtained results suggest that adsorption of OCHRA was dependent on the form of OCHRA in solution and that type of surfactant had an influence on OCHRA adsorption. Adsorption of ZEN by organokaolines also showed nonlinear isotherms at pH 3 and 7 and similar amounts were adsorbed at both adsorbents at both pH values. The obtained adsorption capacities suggest that adsorption of ZEN was practically independent of the form of the toxin in solution and also on the type of the organic cations in the kaolin structure. Based on the obtained results, kaolin modified with surfactants may be effective materials for adsorption of ZEN and OCHRA.",
publisher = "Belgrade : Association of Metallurgical Engineers of Serbia",
journal = "Metallurgical & Materials Engineering Congress of South-East Europe",
title = "Cationic surfactants modified kaolin – Efficient adsorbents for mycotoxins",
pages = "12-12"
}

Daković, A.,& Spasojević, M.. (2019). Cationic surfactants modified kaolin – Efficient adsorbents for mycotoxins. in Metallurgical & Materials Engineering Congress of South-East Europe
Belgrade : Association of Metallurgical Engineers of Serbia., 12-12.

Daković A, Spasojević M. Cationic surfactants modified kaolin – Efficient adsorbents for mycotoxins. in Metallurgical & Materials Engineering Congress of South-East Europe. 2019;:12-12..

Daković, Aleksandra, Spasojević, Milica, "Cationic surfactants modified kaolin – Efficient adsorbents for mycotoxins" in Metallurgical & Materials Engineering Congress of South-East Europe (2019):12-12.

TY  - CONF
AU  - Spasojević, Milica
AU  - Daković, Aleksandra
AU  - Rottinghaus, George E.
AU  - Obradović, Milena
AU  - Krajišnik, Danina
AU  - Mercurio, Mariano
AU  - Smiljanić, Danijela
PY  - 2019
UR  - https://ritnms.itnms.ac.rs/handle/123456789/739
AB  - Zeolite – phillipsite was modified with long chain organic surfactant – hexadecyltrimethyl-ammonium bromide (HB). Two different amounts of HB were used to modify the zeolitic surface (150 % and 200% of phillisite external exchange capacity - ECEC). Adsorption of non-steroidal antiinflam matory drug – ibuprofen (IBU) was studied at pH 7, at different initial drug concentrations. Adsorption increased with increasing the initial drug concentrations as well as with increasing amounts of organic phase at the phillipsite surface. From the Langmuir model, the maximum IBU adsorption capacity for phillipsite modified with surfactant at 150 % of ECEC was 12.72 mg/g, while for organophillipsite containing surfactant in amount of 200 % of ECEC, the maximum adsorption capacity was 18.25 mg/g.
PB  - Serbian Zeolite Association
C3  - 8th Serbian-Croatian-Slovenian Symposium on Zeolites
T1  - Organophillipsite as potential low cost adsorbent for removal of ibuprofen
EP  - 125
SP  - 122
ER  - 

@conference{
author = "Spasojević, Milica and Daković, Aleksandra and Rottinghaus, George E. and Obradović, Milena and Krajišnik, Danina and Mercurio, Mariano and Smiljanić, Danijela",
year = "2019",
abstract = "Zeolite – phillipsite was modified with long chain organic surfactant – hexadecyltrimethyl-ammonium bromide (HB). Two different amounts of HB were used to modify the zeolitic surface (150 % and 200% of phillisite external exchange capacity - ECEC). Adsorption of non-steroidal antiinflam matory drug – ibuprofen (IBU) was studied at pH 7, at different initial drug concentrations. Adsorption increased with increasing the initial drug concentrations as well as with increasing amounts of organic phase at the phillipsite surface. From the Langmuir model, the maximum IBU adsorption capacity for phillipsite modified with surfactant at 150 % of ECEC was 12.72 mg/g, while for organophillipsite containing surfactant in amount of 200 % of ECEC, the maximum adsorption capacity was 18.25 mg/g.",
publisher = "Serbian Zeolite Association",
journal = "8th Serbian-Croatian-Slovenian Symposium on Zeolites",
title = "Organophillipsite as potential low cost adsorbent for removal of ibuprofen",
pages = "125-122"
}

Spasojević, M., Daković, A., Rottinghaus, G. E., Obradović, M., Krajišnik, D., Mercurio, M.,& Smiljanić, D.. (2019). Organophillipsite as potential low cost adsorbent for removal of ibuprofen. in 8th Serbian-Croatian-Slovenian Symposium on Zeolites
Serbian Zeolite Association., 122-125.

Spasojević M, Daković A, Rottinghaus GE, Obradović M, Krajišnik D, Mercurio M, Smiljanić D. Organophillipsite as potential low cost adsorbent for removal of ibuprofen. in 8th Serbian-Croatian-Slovenian Symposium on Zeolites. 2019;:122-125..

Spasojević, Milica, Daković, Aleksandra, Rottinghaus, George E., Obradović, Milena, Krajišnik, Danina, Mercurio, Mariano, Smiljanić, Danijela, "Organophillipsite as potential low cost adsorbent for removal of ibuprofen" in 8th Serbian-Croatian-Slovenian Symposium on Zeolites (2019):122-125.

TY  - CONF
AU  - Obradović, Milena
AU  - Daković, Aleksandra
AU  - Rottinghaus, George E.
AU  - Spasojević, Milica
AU  - Marković, Marija
PY  - 2019
UR  - https://ritnms.itnms.ac.rs/handle/123456789/737
AB  - The contamination of the natural aquatic environment by pharmaceuticals is a serious environmental problem due to their extensive use in human health and animal husbandry. One of the most efficient technique for removal of pharmaceuticals from water is their adsorption on activated carbons, clays and zeolites. In this study adsorption of ketoprofen (KETO), widely used non-steroidal anti-inflammatory drug, on modified kaolin was invesitgated. The natural kaolin (from Rgotina, Serbia) was modified with cationic surfactant hexadecyltrimethyl ammonium bromide in amounts equivalent to 50% and 90% of kaolin cationic exchange capacity. FTIR and DTA/TGA were used for characterisation of materials. The obtained data showed that adsorption of KETO by modified kaolin increased with increasing the amount of surfactant, as well as with increasing the amount of solid phase in the suspension (0.5 – 5.0 mg/ml). According to obtained results modified kaolin may be used as adsobent for removal of KETO from contaminated water.
PB  - Belgrade : Institute of Technical Sciences of SASA
C3  - Eighteenth Young Researchers’ Conference Materials Science and Engineering
T1  - Kaolin modified with cationic surfactant as a potential adsorbent for ketoprofen
EP  - 85
SP  - 85
ER  - 

@conference{
author = "Obradović, Milena and Daković, Aleksandra and Rottinghaus, George E. and Spasojević, Milica and Marković, Marija",
year = "2019",
abstract = "The contamination of the natural aquatic environment by pharmaceuticals is a serious environmental problem due to their extensive use in human health and animal husbandry. One of the most efficient technique for removal of pharmaceuticals from water is their adsorption on activated carbons, clays and zeolites. In this study adsorption of ketoprofen (KETO), widely used non-steroidal anti-inflammatory drug, on modified kaolin was invesitgated. The natural kaolin (from Rgotina, Serbia) was modified with cationic surfactant hexadecyltrimethyl ammonium bromide in amounts equivalent to 50% and 90% of kaolin cationic exchange capacity. FTIR and DTA/TGA were used for characterisation of materials. The obtained data showed that adsorption of KETO by modified kaolin increased with increasing the amount of surfactant, as well as with increasing the amount of solid phase in the suspension (0.5 – 5.0 mg/ml). According to obtained results modified kaolin may be used as adsobent for removal of KETO from contaminated water.",
publisher = "Belgrade : Institute of Technical Sciences of SASA",
journal = "Eighteenth Young Researchers’ Conference Materials Science and Engineering",
title = "Kaolin modified with cationic surfactant as a potential adsorbent for ketoprofen",
pages = "85-85"
}

Obradović, M., Daković, A., Rottinghaus, G. E., Spasojević, M.,& Marković, M.. (2019). Kaolin modified with cationic surfactant as a potential adsorbent for ketoprofen. in Eighteenth Young Researchers’ Conference Materials Science and Engineering
Belgrade : Institute of Technical Sciences of SASA., 85-85.

Obradović M, Daković A, Rottinghaus GE, Spasojević M, Marković M. Kaolin modified with cationic surfactant as a potential adsorbent for ketoprofen. in Eighteenth Young Researchers’ Conference Materials Science and Engineering. 2019;:85-85..

Obradović, Milena, Daković, Aleksandra, Rottinghaus, George E., Spasojević, Milica, Marković, Marija, "Kaolin modified with cationic surfactant as a potential adsorbent for ketoprofen" in Eighteenth Young Researchers’ Conference Materials Science and Engineering (2019):85-85.