TY  - CONF
AU  - Radosavljevic-Mihajlovic, Ana
AU  - Kremenović, Aleksandar
AU  - Dondur, Vera
AU  - Janjić, Goran
PY  - 2017
UR  - https://ritnms.itnms.ac.rs/handle/123456789/719
AB  - The most common zeolites which are used as precursors for ceramic materials are synthetic zeolites of LTA, FAU or GIS topology. Eberhard presented the first data for synthetic feldspars MnAl2Si2O8 [1], while Matsui and Kimata presented the structural
results of investigation in the three component system MnAl2Si2O8−CaAl2Si2O8−SrAl2Si2O8 [2].
Thermally induced phase transformation of Mn-exchange LTA and FAU zeolites are followed in the range from room temperature to 1300 ºC. Both frameworks collapse into amorphous intermediate products after heating between 600 and 650 °C. Prolonged heating of the intermediate product over 1100°C results directly in formation of a
disorder Mn anorthite LTA [a = 8.10 95(4) Å, b = 12.824(4) Å, c = 7.0674(4) Å, β = 115.89(3)] and Mn anorthite FAU [a = 8.0498(4) Å, b = 12.758(4) Å, c = 7.0356(4) Å, β =116.13(3)] phase. The phase conversions in the temperature range investigated were followed by thermal (DTA, TGA, and DSC) and FTIR analyses. The crystal structures of both anorthite phases are refined by Rietveld method against X- ray powder diffraction data (Figure 1).
AB  - Najčešći zeoliti koji se koriste kao prekursori za keramičke materijale su sintetički zeoliti sa LTA, FAU ili GIS topologijom. Eberhard je prvi publikovao strukturne
podatke za sintetičke feldspate, sa formulom MnAl2Si2O8 [1], dok su Matsui i Kimata
prvi predstavili strukturne podatke za trokomponentni sistem, sa bruto formulom
MnAl2Si2O8−CaAl2Si2O8−SrAl2Si2O8 [2].
Termički indukovane fazne transformacije LTA i FAU zeolita sa izmenjenim Mn, praćene su u opsegu temperatura od sobne do 1300 ºC. Kolaps u amorfnim intermedijerima kod oba tipa zeolita se javlja nakon zagrevanja između 600 i 650 °C. Produženo zagrevanje intermedijernog proizvoda preko 1100 °C rezultatira direktnom
formiranju disordera
u Mn-anortit-LTA
[a = 8.1095(4) Å, b
=
12.824(4)
Å,
c = 7.0674(4) Å,
β
=
115.89(3)]
i
Mn-anortit-FAU fazi
[a
=
8.0498(4)
Å,
b = 12.758(4) Å,
c
= 7.0356(4) Å,
β
=
116.13(3)]. Fazni
prelazi
u ispitivanom
temperaturnom opsegu praćena je primenom termalne (DTA, TGA i DSC) i FTIR analize. Kristalne strukture oba anortita su utačnjene korišćenjem Ritveldove metode (slika 1), primenjene na podatke prikupljene rendgenskom difrakcijom sa polikristalnih materijala.
PB  - Belgrade : Serbian Crystallographic Society
C3  - 24th Conference of the Serbian Crystallographiic society
T1  - The crystal structure of Mn-anorthite synthesized by ion-exchange zeolite with LTA and FAU topology
T1  - Kristalna struktura Mn-anortita sintetisanog iz zeolita jonskom izmenom sa LTA i FAU topologijom
EP  - 65
SP  - 64
ER  - 

@conference{
author = "Radosavljevic-Mihajlovic, Ana and Kremenović, Aleksandar and Dondur, Vera and Janjić, Goran",
year = "2017",
abstract = "The most common zeolites which are used as precursors for ceramic materials are synthetic zeolites of LTA, FAU or GIS topology. Eberhard presented the first data for synthetic feldspars MnAl2Si2O8 [1], while Matsui and Kimata presented the structural
results of investigation in the three component system MnAl2Si2O8−CaAl2Si2O8−SrAl2Si2O8 [2].
Thermally induced phase transformation of Mn-exchange LTA and FAU zeolites are followed in the range from room temperature to 1300 ºC. Both frameworks collapse into amorphous intermediate products after heating between 600 and 650 °C. Prolonged heating of the intermediate product over 1100°C results directly in formation of a
disorder Mn anorthite LTA [a = 8.10 95(4) Å, b = 12.824(4) Å, c = 7.0674(4) Å, β = 115.89(3)] and Mn anorthite FAU [a = 8.0498(4) Å, b = 12.758(4) Å, c = 7.0356(4) Å, β =116.13(3)] phase. The phase conversions in the temperature range investigated were followed by thermal (DTA, TGA, and DSC) and FTIR analyses. The crystal structures of both anorthite phases are refined by Rietveld method against X- ray powder diffraction data (Figure 1)., Najčešći zeoliti koji se koriste kao prekursori za keramičke materijale su sintetički zeoliti sa LTA, FAU ili GIS topologijom. Eberhard je prvi publikovao strukturne
podatke za sintetičke feldspate, sa formulom MnAl2Si2O8 [1], dok su Matsui i Kimata
prvi predstavili strukturne podatke za trokomponentni sistem, sa bruto formulom
MnAl2Si2O8−CaAl2Si2O8−SrAl2Si2O8 [2].
Termički indukovane fazne transformacije LTA i FAU zeolita sa izmenjenim Mn, praćene su u opsegu temperatura od sobne do 1300 ºC. Kolaps u amorfnim intermedijerima kod oba tipa zeolita se javlja nakon zagrevanja između 600 i 650 °C. Produženo zagrevanje intermedijernog proizvoda preko 1100 °C rezultatira direktnom
formiranju disordera
u Mn-anortit-LTA
[a = 8.1095(4) Å, b
=
12.824(4)
Å,
c = 7.0674(4) Å,
β
=
115.89(3)]
i
Mn-anortit-FAU fazi
[a
=
8.0498(4)
Å,
b = 12.758(4) Å,
c
= 7.0356(4) Å,
β
=
116.13(3)]. Fazni
prelazi
u ispitivanom
temperaturnom opsegu praćena je primenom termalne (DTA, TGA i DSC) i FTIR analize. Kristalne strukture oba anortita su utačnjene korišćenjem Ritveldove metode (slika 1), primenjene na podatke prikupljene rendgenskom difrakcijom sa polikristalnih materijala.",
publisher = "Belgrade : Serbian Crystallographic Society",
journal = "24th Conference of the Serbian Crystallographiic society",
title = "The crystal structure of Mn-anorthite synthesized by ion-exchange zeolite with LTA and FAU topology, Kristalna struktura Mn-anortita sintetisanog iz zeolita jonskom izmenom sa LTA i FAU topologijom",
pages = "65-64"
}

Radosavljevic-Mihajlovic, A., Kremenović, A., Dondur, V.,& Janjić, G.. (2017). The crystal structure of Mn-anorthite synthesized by ion-exchange zeolite with LTA and FAU topology. in 24th Conference of the Serbian Crystallographiic society
Belgrade : Serbian Crystallographic Society., 64-65.

Radosavljevic-Mihajlovic A, Kremenović A, Dondur V, Janjić G. The crystal structure of Mn-anorthite synthesized by ion-exchange zeolite with LTA and FAU topology. in 24th Conference of the Serbian Crystallographiic society. 2017;:64-65..

Radosavljevic-Mihajlovic, Ana, Kremenović, Aleksandar, Dondur, Vera, Janjić, Goran, "The crystal structure of Mn-anorthite synthesized by ion-exchange zeolite with LTA and FAU topology" in 24th Conference of the Serbian Crystallographiic society (2017):64-65.

TY  - JOUR
AU  - Marković, Marija
AU  - Daković, Aleksandra
AU  - Rottinghaus, George E.
AU  - Stojanović, Mirjana
AU  - Dondur, Vera
AU  - Kragović, Milan
AU  - Gulišija, Zvonko
PY  - 2016
UR  - https://ritnms.itnms.ac.rs/handle/123456789/405
AB  - Aflatoxin B-1 adsorption by the concentrate of bentonite clay - montmorillonite and the natural zeolite -clinoptilolite and was investigated at the initial toxin concentration of 4 ppm, with different amounts of solid phase in suspension (1, 0.5, 0.2 and 0.1 g/L) and different pH values - 3, 7 and 9. Results indicated that for both minerals, decreasing the amount of solid phase in suspension, decrease the amount of active sites relevant for adsorption of aflatoxin B-1. Thus, for concentrate of montnorillonite, at the lowest level of solid phase in suspension (0.1 g/L), aflatoxin B-1 adsorption indexes were 97% at pH 3, 88% at pH 7 and 82% at pH 9, while for the natural zeolite, adsorption of toxin was 9% at pH 3 and 7% at pH 7 and 9. Since inorganic cations in minerals are mainly responsible for aflatoxin B-1 adsorption, even the natural zeolite - clinoptilite has much higher cation exchange capacity (the content of inorganic exchangeable cations) compared to the concentrate of montmorillonite, adsorption of aflatoxin B-1 by this mineral is much lower. Comparing the molecular dimensions of aflatoxin B-1 molecule with the dimension of channels of clinoptilolite and interlamellar space of montmorillonite it is obvious that this toxin is adsorbed only at the external surface of clinoptilolite while in the montmorillonite all active sites are equally available for its adsorption. Thus, the concentrate of montmorillonite possesses higher adsorption capacity for aflatoxin B-1. Results presented in this paper confirmed the fact that the differences in the structure of minerals led to their different efficiency for adsorption of aflatoxin B-1. Mineralogical and chemical composition, determination of cation exchange capacity, etc., are very important parameters influencing the effectiveness of minerals as aflatoxin B-1 adsorbents.
PB  - Savez hemijskih inženjera, Beograd
T2  - Hemijska industrija
T1  - Aflatoxin b-1 adsorption by the natural aluminosilicates - concentrate of montmorillonite and zeolite
EP  - 524
IS  - 5
SP  - 519
VL  - 70
DO  - 10.2298/HEMIND150515058M
UR  - conv_778
ER  - 

@article{
author = "Marković, Marija and Daković, Aleksandra and Rottinghaus, George E. and Stojanović, Mirjana and Dondur, Vera and Kragović, Milan and Gulišija, Zvonko",
year = "2016",
abstract = "Aflatoxin B-1 adsorption by the concentrate of bentonite clay - montmorillonite and the natural zeolite -clinoptilolite and was investigated at the initial toxin concentration of 4 ppm, with different amounts of solid phase in suspension (1, 0.5, 0.2 and 0.1 g/L) and different pH values - 3, 7 and 9. Results indicated that for both minerals, decreasing the amount of solid phase in suspension, decrease the amount of active sites relevant for adsorption of aflatoxin B-1. Thus, for concentrate of montnorillonite, at the lowest level of solid phase in suspension (0.1 g/L), aflatoxin B-1 adsorption indexes were 97% at pH 3, 88% at pH 7 and 82% at pH 9, while for the natural zeolite, adsorption of toxin was 9% at pH 3 and 7% at pH 7 and 9. Since inorganic cations in minerals are mainly responsible for aflatoxin B-1 adsorption, even the natural zeolite - clinoptilite has much higher cation exchange capacity (the content of inorganic exchangeable cations) compared to the concentrate of montmorillonite, adsorption of aflatoxin B-1 by this mineral is much lower. Comparing the molecular dimensions of aflatoxin B-1 molecule with the dimension of channels of clinoptilolite and interlamellar space of montmorillonite it is obvious that this toxin is adsorbed only at the external surface of clinoptilolite while in the montmorillonite all active sites are equally available for its adsorption. Thus, the concentrate of montmorillonite possesses higher adsorption capacity for aflatoxin B-1. Results presented in this paper confirmed the fact that the differences in the structure of minerals led to their different efficiency for adsorption of aflatoxin B-1. Mineralogical and chemical composition, determination of cation exchange capacity, etc., are very important parameters influencing the effectiveness of minerals as aflatoxin B-1 adsorbents.",
publisher = "Savez hemijskih inženjera, Beograd",
journal = "Hemijska industrija",
title = "Aflatoxin b-1 adsorption by the natural aluminosilicates - concentrate of montmorillonite and zeolite",
pages = "524-519",
number = "5",
volume = "70",
doi = "10.2298/HEMIND150515058M",
url = "conv_778"
}

Marković, M., Daković, A., Rottinghaus, G. E., Stojanović, M., Dondur, V., Kragović, M.,& Gulišija, Z.. (2016). Aflatoxin b-1 adsorption by the natural aluminosilicates - concentrate of montmorillonite and zeolite. in Hemijska industrija
Savez hemijskih inženjera, Beograd., 70(5), 519-524.
https://doi.org/10.2298/HEMIND150515058M
conv_778

Marković M, Daković A, Rottinghaus GE, Stojanović M, Dondur V, Kragović M, Gulišija Z. Aflatoxin b-1 adsorption by the natural aluminosilicates - concentrate of montmorillonite and zeolite. in Hemijska industrija. 2016;70(5):519-524.
doi:10.2298/HEMIND150515058M
conv_778 .

Marković, Marija, Daković, Aleksandra, Rottinghaus, George E., Stojanović, Mirjana, Dondur, Vera, Kragović, Milan, Gulišija, Zvonko, "Aflatoxin b-1 adsorption by the natural aluminosilicates - concentrate of montmorillonite and zeolite" in Hemijska industrija, 70, no. 5 (2016):519-524,
https://doi.org/10.2298/HEMIND150515058M .,
conv_778 .

TY  - JOUR
AU  - Omerasević, Mia
AU  - Ruzić, Jovana
AU  - Vuković, Nikola
AU  - Jovanović, Uros
AU  - Mirković, Miljana
AU  - Maksimović, Vesna
AU  - Dondur, Vera
PY  - 2016
UR  - https://ritnms.itnms.ac.rs/handle/123456789/392
AB  - The possibility to use natural zeolite - clinoptilolite as a host material for radioactive Cs immobilization has been investigated. Cs-exchanged form of clinoptilolite which was prepared by treatment of clinoptilolite powder with 0.25 M CsCl solution was compacted. Both, powder and powder compact of exchanged clinoptilolite were thermally treated at 1200 C-0. The XRPD analysis showed that Cs was successfully immobilized after heat treatment by formation of stable cesium dodecaoxo-alumopentasilicate in both, powder sample and compact. The newly formed compound showed satisfactory Cs ions retention during leaching test. The sintered compact showed somewhat better resistance to Cs leaching than the thermally treated powder. The compressive strength of sintered compact was close to 200 MPa which is more than enough for easy handling and safe storage.
PB  - Međunarodni Institut za nauku o sinterovanju, Beograd
T2  - Science of Sintering
T1  - Removal of Cs Ions from Aqueous Solutions by Using Matrices of Natural Clinoptilolite and its Safe Disposal
EP  - 107
IS  - 1
SP  - 101
VL  - 48
DO  - 10.2298/SOS1601101O
UR  - conv_761
ER  - 

@article{
author = "Omerasević, Mia and Ruzić, Jovana and Vuković, Nikola and Jovanović, Uros and Mirković, Miljana and Maksimović, Vesna and Dondur, Vera",
year = "2016",
abstract = "The possibility to use natural zeolite - clinoptilolite as a host material for radioactive Cs immobilization has been investigated. Cs-exchanged form of clinoptilolite which was prepared by treatment of clinoptilolite powder with 0.25 M CsCl solution was compacted. Both, powder and powder compact of exchanged clinoptilolite were thermally treated at 1200 C-0. The XRPD analysis showed that Cs was successfully immobilized after heat treatment by formation of stable cesium dodecaoxo-alumopentasilicate in both, powder sample and compact. The newly formed compound showed satisfactory Cs ions retention during leaching test. The sintered compact showed somewhat better resistance to Cs leaching than the thermally treated powder. The compressive strength of sintered compact was close to 200 MPa which is more than enough for easy handling and safe storage.",
publisher = "Međunarodni Institut za nauku o sinterovanju, Beograd",
journal = "Science of Sintering",
title = "Removal of Cs Ions from Aqueous Solutions by Using Matrices of Natural Clinoptilolite and its Safe Disposal",
pages = "107-101",
number = "1",
volume = "48",
doi = "10.2298/SOS1601101O",
url = "conv_761"
}

Omerasević, M., Ruzić, J., Vuković, N., Jovanović, U., Mirković, M., Maksimović, V.,& Dondur, V.. (2016). Removal of Cs Ions from Aqueous Solutions by Using Matrices of Natural Clinoptilolite and its Safe Disposal. in Science of Sintering
Međunarodni Institut za nauku o sinterovanju, Beograd., 48(1), 101-107.
https://doi.org/10.2298/SOS1601101O
conv_761

Omerasević M, Ruzić J, Vuković N, Jovanović U, Mirković M, Maksimović V, Dondur V. Removal of Cs Ions from Aqueous Solutions by Using Matrices of Natural Clinoptilolite and its Safe Disposal. in Science of Sintering. 2016;48(1):101-107.
doi:10.2298/SOS1601101O
conv_761 .

Omerasević, Mia, Ruzić, Jovana, Vuković, Nikola, Jovanović, Uros, Mirković, Miljana, Maksimović, Vesna, Dondur, Vera, "Removal of Cs Ions from Aqueous Solutions by Using Matrices of Natural Clinoptilolite and its Safe Disposal" in Science of Sintering, 48, no. 1 (2016):101-107,
https://doi.org/10.2298/SOS1601101O .,
conv_761 .

TY  - CONF
AU  - Stojanović, Mirjana
AU  - Mihajlović, Marija
AU  - Lačnjevac, Časlav
AU  - Lopičić, Zorica
AU  - Petrović, Jelena
AU  - Dondur, Vera
AU  - Jović, Aleksandra
PY  - 2015
UR  - https://ritnms.itnms.ac.rs/handle/123456789/918
AB  - The widespread use of depleted uranium (DU) munitions in past wars has
generated a great deal and fear of concern of potential impact on the environment
and human health. During the NATO operations in the former Yugoslavia in
1999.y, Kosovo and Metohia and southern Serbia, were bombed with around 10
tons of DU munitions. Sixteen years ago there was very little available information
about the behavior of ecological systems damaged by DU ammunition fired and
the factors that control the corrosion of DU and its subsequent migration through
the environment. Today we are faced with the “invisible threat” of DU, which has a
strong radioactive and hemotoxic impact on human health. This paper provides a
latest finding of corrosion and corrosion behavior of DU and environmental factors
that control corrosion, together with indicators of environmental impact in order to
highlight areas that need further attention in developing remediation programs.
PB  - Belgrade : Association of Metallurgical Engineers of Serbia
C3  - Metallurgical & Materials Engineering Congress of South‐East Europe-MEE SEE 2015
T1  - Long‐term behavior of depleted uranium in the environment
EP  - 253
SP  - 247
ER  - 

@conference{
author = "Stojanović, Mirjana and Mihajlović, Marija and Lačnjevac, Časlav and Lopičić, Zorica and Petrović, Jelena and Dondur, Vera and Jović, Aleksandra",
year = "2015",
abstract = "The widespread use of depleted uranium (DU) munitions in past wars has
generated a great deal and fear of concern of potential impact on the environment
and human health. During the NATO operations in the former Yugoslavia in
1999.y, Kosovo and Metohia and southern Serbia, were bombed with around 10
tons of DU munitions. Sixteen years ago there was very little available information
about the behavior of ecological systems damaged by DU ammunition fired and
the factors that control the corrosion of DU and its subsequent migration through
the environment. Today we are faced with the “invisible threat” of DU, which has a
strong radioactive and hemotoxic impact on human health. This paper provides a
latest finding of corrosion and corrosion behavior of DU and environmental factors
that control corrosion, together with indicators of environmental impact in order to
highlight areas that need further attention in developing remediation programs.",
publisher = "Belgrade : Association of Metallurgical Engineers of Serbia",
journal = "Metallurgical & Materials Engineering Congress of South‐East Europe-MEE SEE 2015",
title = "Long‐term behavior of depleted uranium in the environment",
pages = "253-247"
}

Stojanović, M., Mihajlović, M., Lačnjevac, Č., Lopičić, Z., Petrović, J., Dondur, V.,& Jović, A.. (2015). Long‐term behavior of depleted uranium in the environment. in Metallurgical & Materials Engineering Congress of South‐East Europe-MEE SEE 2015
Belgrade : Association of Metallurgical Engineers of Serbia., 247-253.

Stojanović M, Mihajlović M, Lačnjevac Č, Lopičić Z, Petrović J, Dondur V, Jović A. Long‐term behavior of depleted uranium in the environment. in Metallurgical & Materials Engineering Congress of South‐East Europe-MEE SEE 2015. 2015;:247-253..

Stojanović, Mirjana, Mihajlović, Marija, Lačnjevac, Časlav, Lopičić, Zorica, Petrović, Jelena, Dondur, Vera, Jović, Aleksandra, "Long‐term behavior of depleted uranium in the environment" in Metallurgical & Materials Engineering Congress of South‐East Europe-MEE SEE 2015 (2015):247-253.

TY  - CONF
AU  - Kragović, Milan
AU  - Daković, Aleksandra
AU  - Marković, Marija
AU  - Stojanović, Mirjana
AU  - Petrović, Jelena
AU  - Dondur, Vera
AU  - Jović, Aleksandar
PY  - 2015
UR  - https://ritnms.itnms.ac.rs/handle/123456789/697
AB  - The efficiency of the natural and Fe(III)-modified zeolite for Pb2+ removal at different initial
pH (2.5, 4.2 and 5.0) was investigated. For initial pH 2.5, for all concentrations and both
adsorbents ion exchange of inorganic cations in zeolites with lead ions, together with uptake of
hydrogen occurred. For initial pH 5.0 it was determined that at lower initial concentrations of
lead ion, ion exchange occurred, while at higher initial concentrations beside these processes,
chemisorption of lead ions occurred on both adsorbents. Preliminary experiments on waste
water obtained after flotation process in facility of lead and zinc mine showed that waste water
treatment with both adsorbents reduced the content of all investigated heavy metal cations.
However, better removal was achieved with the Fe(III)-modified zeolite.
PB  - Croatian Zeolite Association
C3  - 6th Croatian-Slovenian-Serbian Symposium on Zeolites
T1  - Removal of lead ions from simulated and real pollutant solutions by using the natural and Fe(III)-modified zeolite
EP  - 68
SP  - 65
ER  - 

@conference{
author = "Kragović, Milan and Daković, Aleksandra and Marković, Marija and Stojanović, Mirjana and Petrović, Jelena and Dondur, Vera and Jović, Aleksandar",
year = "2015",
abstract = "The efficiency of the natural and Fe(III)-modified zeolite for Pb2+ removal at different initial
pH (2.5, 4.2 and 5.0) was investigated. For initial pH 2.5, for all concentrations and both
adsorbents ion exchange of inorganic cations in zeolites with lead ions, together with uptake of
hydrogen occurred. For initial pH 5.0 it was determined that at lower initial concentrations of
lead ion, ion exchange occurred, while at higher initial concentrations beside these processes,
chemisorption of lead ions occurred on both adsorbents. Preliminary experiments on waste
water obtained after flotation process in facility of lead and zinc mine showed that waste water
treatment with both adsorbents reduced the content of all investigated heavy metal cations.
However, better removal was achieved with the Fe(III)-modified zeolite.",
publisher = "Croatian Zeolite Association",
journal = "6th Croatian-Slovenian-Serbian Symposium on Zeolites",
title = "Removal of lead ions from simulated and real pollutant solutions by using the natural and Fe(III)-modified zeolite",
pages = "68-65"
}

Kragović, M., Daković, A., Marković, M., Stojanović, M., Petrović, J., Dondur, V.,& Jović, A.. (2015). Removal of lead ions from simulated and real pollutant solutions by using the natural and Fe(III)-modified zeolite. in 6th Croatian-Slovenian-Serbian Symposium on Zeolites
Croatian Zeolite Association., 65-68.

Kragović M, Daković A, Marković M, Stojanović M, Petrović J, Dondur V, Jović A. Removal of lead ions from simulated and real pollutant solutions by using the natural and Fe(III)-modified zeolite. in 6th Croatian-Slovenian-Serbian Symposium on Zeolites. 2015;:65-68..

Kragović, Milan, Daković, Aleksandra, Marković, Marija, Stojanović, Mirjana, Petrović, Jelena, Dondur, Vera, Jović, Aleksandar, "Removal of lead ions from simulated and real pollutant solutions by using the natural and Fe(III)-modified zeolite" in 6th Croatian-Slovenian-Serbian Symposium on Zeolites (2015):65-68.

TY  - JOUR
AU  - Radosavljevic-Mihajlovic, Ana
AU  - Kremenović, Aleksandar
AU  - Došen, Anja
AU  - Andrejić, Jelena
AU  - Dondur, Vera
PY  - 2015
UR  - https://ritnms.itnms.ac.rs/handle/123456789/997
AB  - Thermally induced phase transformations of Pb-exchange LTA and FAU zeolites were from ambient temperature to 1300 °C. Both frameworks collapse into amorphous intermediate products after heating between 600 and 650 °C. Prolonged heating of the intermediate product over 1100 °C results in the formation of disordered Pb-feldsparLTA [a = 8.414 (4) Å, b = 13.048 (4) Å, c = 7.169 (4) Å, β = 115.35° (3)] and Pb-feldsparFAU [a = 8.422 (4) Å, b = 13.054 (4) Å, c = 7.173 (4) Å, β = 115.37° (3)] phases. The phase conversions within the investigated temperature range were followed by thermal (DTA, TGA, and DSC), XRPD, and Raman methods.
PB  - Elsevier
T2  - Microporous and Mesoporous Materials
T1  - Thermally induced phase transformation of Pb-exchanged LTA and FAU-framework zeolite to feldspar phases
EP  - 218
SP  - 210
VL  - 20
DO  - 10.1016/j.micromeso.2014.08.059
ER  - 

@article{
author = "Radosavljevic-Mihajlovic, Ana and Kremenović, Aleksandar and Došen, Anja and Andrejić, Jelena and Dondur, Vera",
year = "2015",
abstract = "Thermally induced phase transformations of Pb-exchange LTA and FAU zeolites were from ambient temperature to 1300 °C. Both frameworks collapse into amorphous intermediate products after heating between 600 and 650 °C. Prolonged heating of the intermediate product over 1100 °C results in the formation of disordered Pb-feldsparLTA [a = 8.414 (4) Å, b = 13.048 (4) Å, c = 7.169 (4) Å, β = 115.35° (3)] and Pb-feldsparFAU [a = 8.422 (4) Å, b = 13.054 (4) Å, c = 7.173 (4) Å, β = 115.37° (3)] phases. The phase conversions within the investigated temperature range were followed by thermal (DTA, TGA, and DSC), XRPD, and Raman methods.",
publisher = "Elsevier",
journal = "Microporous and Mesoporous Materials",
title = "Thermally induced phase transformation of Pb-exchanged LTA and FAU-framework zeolite to feldspar phases",
pages = "218-210",
volume = "20",
doi = "10.1016/j.micromeso.2014.08.059"
}

Radosavljevic-Mihajlovic, A., Kremenović, A., Došen, A., Andrejić, J.,& Dondur, V.. (2015). Thermally induced phase transformation of Pb-exchanged LTA and FAU-framework zeolite to feldspar phases. in Microporous and Mesoporous Materials
Elsevier., 20, 210-218.
https://doi.org/10.1016/j.micromeso.2014.08.059

Radosavljevic-Mihajlovic A, Kremenović A, Došen A, Andrejić J, Dondur V. Thermally induced phase transformation of Pb-exchanged LTA and FAU-framework zeolite to feldspar phases. in Microporous and Mesoporous Materials. 2015;20:210-218.
doi:10.1016/j.micromeso.2014.08.059 .

Radosavljevic-Mihajlovic, Ana, Kremenović, Aleksandar, Došen, Anja, Andrejić, Jelena, Dondur, Vera, "Thermally induced phase transformation of Pb-exchanged LTA and FAU-framework zeolite to feldspar phases" in Microporous and Mesoporous Materials, 20 (2015):210-218,
https://doi.org/10.1016/j.micromeso.2014.08.059 . .

TY  - JOUR
AU  - Krajišnik, Danina
AU  - Daković, Aleksandra
AU  - Malenović, Anđelija
AU  - Milojević-Rakić, Maja
AU  - Dondur, Vera
AU  - Radulović, Željka
AU  - Millc, Jela
PY  - 2013
UR  - https://ritnms.itnms.ac.rs/handle/123456789/261
AB  - Results on adsorption of diclofenac sodium (DS) by modified natural zeolite composites at three levels (10,20 and 30 mmol/100 g) of cationic surfactant-hexadecyltrimethylammonium bromide (HB), in a buffer solution, were compared. Characterization of composites before and after drug adsorption was performed by determination of electrokinetic mobility, FTIR and thermal analysis. The results indicated interactions between drug and carriers. The pharmaceutical performance of cationic surfactant-modified zeolites as drug formulation excipients was evaluated by in vitro dissolution experiments. The results were compared with the drug release from corresponding physical mixtures. Prolonged drug release over a period of 8 h (up to 30%) was achieved with both groups of samples. Furthermore, DS release reached up to 85% from physical mixtures containing drug amount closer to a therapeutic dose.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Clay Science
T1  - Investigation of adsorption and release of diclofenac sodium by modified zeolites composites
EP  - 326
SP  - 322
VL  - 83-84
DO  - 10.1016/j.clay.2013.08.011
UR  - conv_671
ER  - 

@article{
author = "Krajišnik, Danina and Daković, Aleksandra and Malenović, Anđelija and Milojević-Rakić, Maja and Dondur, Vera and Radulović, Željka and Millc, Jela",
year = "2013",
abstract = "Results on adsorption of diclofenac sodium (DS) by modified natural zeolite composites at three levels (10,20 and 30 mmol/100 g) of cationic surfactant-hexadecyltrimethylammonium bromide (HB), in a buffer solution, were compared. Characterization of composites before and after drug adsorption was performed by determination of electrokinetic mobility, FTIR and thermal analysis. The results indicated interactions between drug and carriers. The pharmaceutical performance of cationic surfactant-modified zeolites as drug formulation excipients was evaluated by in vitro dissolution experiments. The results were compared with the drug release from corresponding physical mixtures. Prolonged drug release over a period of 8 h (up to 30%) was achieved with both groups of samples. Furthermore, DS release reached up to 85% from physical mixtures containing drug amount closer to a therapeutic dose.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Clay Science",
title = "Investigation of adsorption and release of diclofenac sodium by modified zeolites composites",
pages = "326-322",
volume = "83-84",
doi = "10.1016/j.clay.2013.08.011",
url = "conv_671"
}

Krajišnik, D., Daković, A., Malenović, A., Milojević-Rakić, M., Dondur, V., Radulović, Ž.,& Millc, J.. (2013). Investigation of adsorption and release of diclofenac sodium by modified zeolites composites. in Applied Clay Science
Elsevier Science Bv, Amsterdam., 83-84, 322-326.
https://doi.org/10.1016/j.clay.2013.08.011
conv_671

Krajišnik D, Daković A, Malenović A, Milojević-Rakić M, Dondur V, Radulović Ž, Millc J. Investigation of adsorption and release of diclofenac sodium by modified zeolites composites. in Applied Clay Science. 2013;83-84:322-326.
doi:10.1016/j.clay.2013.08.011
conv_671 .

Krajišnik, Danina, Daković, Aleksandra, Malenović, Anđelija, Milojević-Rakić, Maja, Dondur, Vera, Radulović, Željka, Millc, Jela, "Investigation of adsorption and release of diclofenac sodium by modified zeolites composites" in Applied Clay Science, 83-84 (2013):322-326,
https://doi.org/10.1016/j.clay.2013.08.011 .,
conv_671 .

TY  - JOUR
AU  - Krajišnik, Danina
AU  - Daković, Aleksandra
AU  - Milojević, Maja
AU  - Malenović, Anđelija
AU  - Kragović, Milan
AU  - Bajuk-Bogdanović, Danica
AU  - Dondur, Vera
AU  - Milić, Jela
PY  - 2011
UR  - https://ritnms.itnms.ac.rs/handle/123456789/189
AB  - In this study an investigation of a model drug sorption onto cationic surfactant-modified natural zeolites as a drug formulation excipient was performed. Natural zeolite was modified with cetylpyridinium chloride in amounts equivalent to 100, 200 and 300% of its external cation-exchange capacity. The starting material and obtained organozeolites were characterized by Fourier transform infrared spectroscopy, zeta potential measurements and thermal analysis. In vitro sorption of diclofenac sodium as a model drug was studied for all surfactant/zeolite composites by means of sorption isotherm measurements in aqueous solutions (pH 7.4). The modified zeolites with three levels of surfactant coverage within the short activation time were prepared. Zeta potential measurements and thermal analysis showed that when the surfactant loading level was equal to external cation-exchange value, almost monolayer of organic phase were present at the zeolitic surface while higher amounts of surfactant produced less extended bilayers, ordered bilayers or admicelles at the zeolitic surface. Modified zeolites, obtained in this manner, were effective in diclofenac sodium sorption and the organic phase derived from adsorbed cetylpyridinium chloride was the primary sorption phase for the model drug. The Langmuir isotherm was found to describe the equilibrium sorption data well over the entire concentration range. The separate contributions of the adsorption and partition to the total sorption of DS were analyzed mathematically. Results revealed that that adsorption and partitioning of the model drug take place simultaneously.
PB  - Elsevier, Amsterdam
T2  - Colloids and Surfaces B-Biointerfaces
T1  - Properties of diclofenac sodium sorption onto natural zeolite modified with cetylpyridinium chloride
EP  - 172
IS  - 1
SP  - 165
VL  - 83
DO  - 10.1016/j.colsurfb.2010.11.024
UR  - conv_598
ER  - 

@article{
author = "Krajišnik, Danina and Daković, Aleksandra and Milojević, Maja and Malenović, Anđelija and Kragović, Milan and Bajuk-Bogdanović, Danica and Dondur, Vera and Milić, Jela",
year = "2011",
abstract = "In this study an investigation of a model drug sorption onto cationic surfactant-modified natural zeolites as a drug formulation excipient was performed. Natural zeolite was modified with cetylpyridinium chloride in amounts equivalent to 100, 200 and 300% of its external cation-exchange capacity. The starting material and obtained organozeolites were characterized by Fourier transform infrared spectroscopy, zeta potential measurements and thermal analysis. In vitro sorption of diclofenac sodium as a model drug was studied for all surfactant/zeolite composites by means of sorption isotherm measurements in aqueous solutions (pH 7.4). The modified zeolites with three levels of surfactant coverage within the short activation time were prepared. Zeta potential measurements and thermal analysis showed that when the surfactant loading level was equal to external cation-exchange value, almost monolayer of organic phase were present at the zeolitic surface while higher amounts of surfactant produced less extended bilayers, ordered bilayers or admicelles at the zeolitic surface. Modified zeolites, obtained in this manner, were effective in diclofenac sodium sorption and the organic phase derived from adsorbed cetylpyridinium chloride was the primary sorption phase for the model drug. The Langmuir isotherm was found to describe the equilibrium sorption data well over the entire concentration range. The separate contributions of the adsorption and partition to the total sorption of DS were analyzed mathematically. Results revealed that that adsorption and partitioning of the model drug take place simultaneously.",
publisher = "Elsevier, Amsterdam",
journal = "Colloids and Surfaces B-Biointerfaces",
title = "Properties of diclofenac sodium sorption onto natural zeolite modified with cetylpyridinium chloride",
pages = "172-165",
number = "1",
volume = "83",
doi = "10.1016/j.colsurfb.2010.11.024",
url = "conv_598"
}

Krajišnik, D., Daković, A., Milojević, M., Malenović, A., Kragović, M., Bajuk-Bogdanović, D., Dondur, V.,& Milić, J.. (2011). Properties of diclofenac sodium sorption onto natural zeolite modified with cetylpyridinium chloride. in Colloids and Surfaces B-Biointerfaces
Elsevier, Amsterdam., 83(1), 165-172.
https://doi.org/10.1016/j.colsurfb.2010.11.024
conv_598

Krajišnik D, Daković A, Milojević M, Malenović A, Kragović M, Bajuk-Bogdanović D, Dondur V, Milić J. Properties of diclofenac sodium sorption onto natural zeolite modified with cetylpyridinium chloride. in Colloids and Surfaces B-Biointerfaces. 2011;83(1):165-172.
doi:10.1016/j.colsurfb.2010.11.024
conv_598 .

Krajišnik, Danina, Daković, Aleksandra, Milojević, Maja, Malenović, Anđelija, Kragović, Milan, Bajuk-Bogdanović, Danica, Dondur, Vera, Milić, Jela, "Properties of diclofenac sodium sorption onto natural zeolite modified with cetylpyridinium chloride" in Colloids and Surfaces B-Biointerfaces, 83, no. 1 (2011):165-172,
https://doi.org/10.1016/j.colsurfb.2010.11.024 .,
conv_598 .

TY  - JOUR
AU  - Krajišnik, Danina
AU  - Milojević, Maja
AU  - Malenović, Anđelija
AU  - Daković, Aleksandra
AU  - Ibrić, Svetlana
AU  - Savić, Snežana
AU  - Dondur, Vera
AU  - Matijašević, Srđan
AU  - Radulović, Aleksandra
AU  - Daniels, Rolf
AU  - Milić, Jela
PY  - 2010
UR  - https://ritnms.itnms.ac.rs/handle/123456789/171
AB  - Context: In this study an investigation of cationic surfactants-modified natural zeolites as drug formulation excipient was performed. Objective: The aim of this work was to carry out a study of the purified natural zeolitic tuff with high amount of clinoptilolite as a potential carrier for molecules of pharmaceutical interest. Materials and methods: Two cationic surfactants (benzalkonium chloride and hexadecyltrimethylammonium bromide) were used for modification of the zeolitic surface in two levels (equal to and twice as external cation-exchange capacity of the zeolitic tuff). Prepared samples were characterized by Fourier transform infrared spectroscopy, thermogravimetric, high-performance liquid chromatography analysis, and powder flow determination. Different surfactant/zeolite composites were used for additional investigation of three model drugs: diclofenac diethylamine, diclofenac sodium, and ibuprofen by means of adsorption isotherm measurements in aqueous solutions. Results: The modified zeolites with two levels of surfactant coverage within the short activation time were prepared. Determination of flow properties showed that modification of zeolitic surface reflected on powder flow characteristics. Investigation of the model drugs adsorption on the obtained composites revealed that a variation between adsorption levels was influenced by the surfactant type and the amount present at the surface of the composites. Discussion and conclusion: In vitro release profiles of the drugs from the zeolite-surfactant-drug composites revealed that sustained drug release could be attained over a period of 8 hours. The presented results for drug uptake by surfactant-zeolite composites and the afterward drug release demonstrated the potential use of investigated modified natural zeolite as excipients for advanced excipients in drug formulations.
PB  - Taylor & Francis Ltd, Abingdon
T2  - Drug Development and Industrial Pharmacy
T1  - Cationic surfactants-modified natural zeolites: improvement of the excipients functionality
EP  - 1224
IS  - 10
SP  - 1215
VL  - 36
DO  - 10.3109/03639041003695121
UR  - conv_588
ER  - 

@article{
author = "Krajišnik, Danina and Milojević, Maja and Malenović, Anđelija and Daković, Aleksandra and Ibrić, Svetlana and Savić, Snežana and Dondur, Vera and Matijašević, Srđan and Radulović, Aleksandra and Daniels, Rolf and Milić, Jela",
year = "2010",
abstract = "Context: In this study an investigation of cationic surfactants-modified natural zeolites as drug formulation excipient was performed. Objective: The aim of this work was to carry out a study of the purified natural zeolitic tuff with high amount of clinoptilolite as a potential carrier for molecules of pharmaceutical interest. Materials and methods: Two cationic surfactants (benzalkonium chloride and hexadecyltrimethylammonium bromide) were used for modification of the zeolitic surface in two levels (equal to and twice as external cation-exchange capacity of the zeolitic tuff). Prepared samples were characterized by Fourier transform infrared spectroscopy, thermogravimetric, high-performance liquid chromatography analysis, and powder flow determination. Different surfactant/zeolite composites were used for additional investigation of three model drugs: diclofenac diethylamine, diclofenac sodium, and ibuprofen by means of adsorption isotherm measurements in aqueous solutions. Results: The modified zeolites with two levels of surfactant coverage within the short activation time were prepared. Determination of flow properties showed that modification of zeolitic surface reflected on powder flow characteristics. Investigation of the model drugs adsorption on the obtained composites revealed that a variation between adsorption levels was influenced by the surfactant type and the amount present at the surface of the composites. Discussion and conclusion: In vitro release profiles of the drugs from the zeolite-surfactant-drug composites revealed that sustained drug release could be attained over a period of 8 hours. The presented results for drug uptake by surfactant-zeolite composites and the afterward drug release demonstrated the potential use of investigated modified natural zeolite as excipients for advanced excipients in drug formulations.",
publisher = "Taylor & Francis Ltd, Abingdon",
journal = "Drug Development and Industrial Pharmacy",
title = "Cationic surfactants-modified natural zeolites: improvement of the excipients functionality",
pages = "1224-1215",
number = "10",
volume = "36",
doi = "10.3109/03639041003695121",
url = "conv_588"
}

Krajišnik, D., Milojević, M., Malenović, A., Daković, A., Ibrić, S., Savić, S., Dondur, V., Matijašević, S., Radulović, A., Daniels, R.,& Milić, J.. (2010). Cationic surfactants-modified natural zeolites: improvement of the excipients functionality. in Drug Development and Industrial Pharmacy
Taylor & Francis Ltd, Abingdon., 36(10), 1215-1224.
https://doi.org/10.3109/03639041003695121
conv_588

Krajišnik D, Milojević M, Malenović A, Daković A, Ibrić S, Savić S, Dondur V, Matijašević S, Radulović A, Daniels R, Milić J. Cationic surfactants-modified natural zeolites: improvement of the excipients functionality. in Drug Development and Industrial Pharmacy. 2010;36(10):1215-1224.
doi:10.3109/03639041003695121
conv_588 .

Krajišnik, Danina, Milojević, Maja, Malenović, Anđelija, Daković, Aleksandra, Ibrić, Svetlana, Savić, Snežana, Dondur, Vera, Matijašević, Srđan, Radulović, Aleksandra, Daniels, Rolf, Milić, Jela, "Cationic surfactants-modified natural zeolites: improvement of the excipients functionality" in Drug Development and Industrial Pharmacy, 36, no. 10 (2010):1215-1224,
https://doi.org/10.3109/03639041003695121 .,
conv_588 .

TY  - JOUR
AU  - Stanić, Tanja
AU  - Daković, Aleksandra
AU  - Zivanović, Aleksandar
AU  - Tomašević-Čanović, Magdalena
AU  - Dondur, Vera
AU  - Milićević, Sonja
PY  - 2009
UR  - https://ritnms.itnms.ac.rs/handle/123456789/156
AB  - Adsorption of arsenic (V) by natural zeolitic tuff, modified with iron (III), was investigated. Also, the iron (III) adsorption characteristics by natural zeolitic tuff was evaluated. It was determined that iron (III) adsorption by starting zeolitic tuff was best represented by the Freundlich type of isotherm, having correlation coefficient (r (2)) of 0.990. Arsenic (V) adsorption by iron (III)-modified zeolitic tuff followed a nonlinear type of isotherm. The best fit of the experimental data was obtained using the Langmuir-Freundlich model (r (2) = 0.99), with the estimated maximum of arsenic (V) adsorption to iron (III)-modified zeolitic tuff of 1.55 mg/g.
PB  - Springer Heidelberg, Heidelberg
T2  - Environmental Chemistry Letters
T1  - Adsorption of arsenic (V) by iron (III)-modified natural zeolitic tuff
EP  - 166
IS  - 2
SP  - 161
VL  - 7
DO  - 10.1007/s10311-008-0152-3
UR  - conv_560
ER  - 

@article{
author = "Stanić, Tanja and Daković, Aleksandra and Zivanović, Aleksandar and Tomašević-Čanović, Magdalena and Dondur, Vera and Milićević, Sonja",
year = "2009",
abstract = "Adsorption of arsenic (V) by natural zeolitic tuff, modified with iron (III), was investigated. Also, the iron (III) adsorption characteristics by natural zeolitic tuff was evaluated. It was determined that iron (III) adsorption by starting zeolitic tuff was best represented by the Freundlich type of isotherm, having correlation coefficient (r (2)) of 0.990. Arsenic (V) adsorption by iron (III)-modified zeolitic tuff followed a nonlinear type of isotherm. The best fit of the experimental data was obtained using the Langmuir-Freundlich model (r (2) = 0.99), with the estimated maximum of arsenic (V) adsorption to iron (III)-modified zeolitic tuff of 1.55 mg/g.",
publisher = "Springer Heidelberg, Heidelberg",
journal = "Environmental Chemistry Letters",
title = "Adsorption of arsenic (V) by iron (III)-modified natural zeolitic tuff",
pages = "166-161",
number = "2",
volume = "7",
doi = "10.1007/s10311-008-0152-3",
url = "conv_560"
}

Stanić, T., Daković, A., Zivanović, A., Tomašević-Čanović, M., Dondur, V.,& Milićević, S.. (2009). Adsorption of arsenic (V) by iron (III)-modified natural zeolitic tuff. in Environmental Chemistry Letters
Springer Heidelberg, Heidelberg., 7(2), 161-166.
https://doi.org/10.1007/s10311-008-0152-3
conv_560

Stanić T, Daković A, Zivanović A, Tomašević-Čanović M, Dondur V, Milićević S. Adsorption of arsenic (V) by iron (III)-modified natural zeolitic tuff. in Environmental Chemistry Letters. 2009;7(2):161-166.
doi:10.1007/s10311-008-0152-3
conv_560 .

Stanić, Tanja, Daković, Aleksandra, Zivanović, Aleksandar, Tomašević-Čanović, Magdalena, Dondur, Vera, Milićević, Sonja, "Adsorption of arsenic (V) by iron (III)-modified natural zeolitic tuff" in Environmental Chemistry Letters, 7, no. 2 (2009):161-166,
https://doi.org/10.1007/s10311-008-0152-3 .,
conv_560 .

TY  - JOUR
AU  - Daković, Aleksandra
AU  - Matijašević, Srđan
AU  - Rottinghaus, George E.
AU  - Dondur, Vera
AU  - Pietrass, Tanja
AU  - Clewett, Catherine F. M.
PY  - 2007
UR  - https://ritnms.itnms.ac.rs/handle/123456789/115
AB  - Adsorption of zearalenone (ZEN) by natural zeolitic tuff, modified with different numbers of octadecyidimethylbenzylammonium (ODMBA) ions, was investigated. The results of solid-state H-1 NMR analysis of the starting material suggested that zeolitic tuff is rich in mineral clinop- tilolite, confirming the results of previous thermal stability study. Three organozeolites (OZ-2, OZ-5, and CZ-10) were prepared with ODMBA surface coverages of 20, 50, and 100 mmol/100 g. The mechanism of ZEN sorption by the three organozeolites was investigated through the determination of the adsorption isotherms at pH 3, 7, and 9. Adsorption of ZEN by organozeolites was best represented by a linear type of isotherm at pH 3, while at pH 7 and 9, adsorption of ZEN by organozeolites followed a nonlinear (Langmuir) type of isotherm. The different shape of the ZEN adsorption isotherms for the three organozeolites with different levels of ODMBA at the zeolitic surface at different pH values suggests that the adsorption mechanism may be dependent on the form of ZEN in solution. Since, at pH 3, ZEN exists in solution as the neutral form, the linear isotherms at pH 3 suggested that hydrophobic interactions are probably responsible for adsorption of neutral, hydrophobic ZEN onto the hydrophobic surface of the organozeolites. At pH 7, the phenolate anion is present in water solution, while at pH 9, ZEN is almost entirely in the anionic form. The nonlinear isotherms obtained for ZEN adsorption by the three organozeolites suggest that sorption appears to be the result of the adsorption process as well as partitioning.
PB  - Academic Press Inc Elsevier Science, San Diego
T2  - Journal of Colloid and Interface Science
T1  - Adsorption of zearalenone by organomodified natural zeolitic tuff
EP  - 13
IS  - 1
SP  - 8
VL  - 311
DO  - 10.1016/j.jcis.2007.02.033
UR  - conv_525
ER  - 

@article{
author = "Daković, Aleksandra and Matijašević, Srđan and Rottinghaus, George E. and Dondur, Vera and Pietrass, Tanja and Clewett, Catherine F. M.",
year = "2007",
abstract = "Adsorption of zearalenone (ZEN) by natural zeolitic tuff, modified with different numbers of octadecyidimethylbenzylammonium (ODMBA) ions, was investigated. The results of solid-state H-1 NMR analysis of the starting material suggested that zeolitic tuff is rich in mineral clinop- tilolite, confirming the results of previous thermal stability study. Three organozeolites (OZ-2, OZ-5, and CZ-10) were prepared with ODMBA surface coverages of 20, 50, and 100 mmol/100 g. The mechanism of ZEN sorption by the three organozeolites was investigated through the determination of the adsorption isotherms at pH 3, 7, and 9. Adsorption of ZEN by organozeolites was best represented by a linear type of isotherm at pH 3, while at pH 7 and 9, adsorption of ZEN by organozeolites followed a nonlinear (Langmuir) type of isotherm. The different shape of the ZEN adsorption isotherms for the three organozeolites with different levels of ODMBA at the zeolitic surface at different pH values suggests that the adsorption mechanism may be dependent on the form of ZEN in solution. Since, at pH 3, ZEN exists in solution as the neutral form, the linear isotherms at pH 3 suggested that hydrophobic interactions are probably responsible for adsorption of neutral, hydrophobic ZEN onto the hydrophobic surface of the organozeolites. At pH 7, the phenolate anion is present in water solution, while at pH 9, ZEN is almost entirely in the anionic form. The nonlinear isotherms obtained for ZEN adsorption by the three organozeolites suggest that sorption appears to be the result of the adsorption process as well as partitioning.",
publisher = "Academic Press Inc Elsevier Science, San Diego",
journal = "Journal of Colloid and Interface Science",
title = "Adsorption of zearalenone by organomodified natural zeolitic tuff",
pages = "13-8",
number = "1",
volume = "311",
doi = "10.1016/j.jcis.2007.02.033",
url = "conv_525"
}

Daković, A., Matijašević, S., Rottinghaus, G. E., Dondur, V., Pietrass, T.,& Clewett, C. F. M.. (2007). Adsorption of zearalenone by organomodified natural zeolitic tuff. in Journal of Colloid and Interface Science
Academic Press Inc Elsevier Science, San Diego., 311(1), 8-13.
https://doi.org/10.1016/j.jcis.2007.02.033
conv_525

Daković A, Matijašević S, Rottinghaus GE, Dondur V, Pietrass T, Clewett CFM. Adsorption of zearalenone by organomodified natural zeolitic tuff. in Journal of Colloid and Interface Science. 2007;311(1):8-13.
doi:10.1016/j.jcis.2007.02.033
conv_525 .

Daković, Aleksandra, Matijašević, Srđan, Rottinghaus, George E., Dondur, Vera, Pietrass, Tanja, Clewett, Catherine F. M., "Adsorption of zearalenone by organomodified natural zeolitic tuff" in Journal of Colloid and Interface Science, 311, no. 1 (2007):8-13,
https://doi.org/10.1016/j.jcis.2007.02.033 .,
conv_525 .

TY  - JOUR
AU  - Jovanović, V.
AU  - Dondur, Vera
AU  - Damjanović, Lj.
AU  - Zakrzewska, J.
AU  - Tomašević-Čanović, Magdalena
PY  - 2006
UR  - https://ritnms.itnms.ac.rs/handle/123456789/101
AB  - The surface properties of zeolites A, X, Y and natural zeolite clinoptilolite (CLI) functionalized by cationic surfactants were investigated. The quaternary ammonium type surfactants, such as hexadecyltrimethylammonium (HDTMA) chloride, stearildimethylbenzylammonium (SDMBA) chloride and distearildimethylammonium (DSDMA) chloride, replaced inorganic cations like Na+ and Ca2+ on the external surface of zeolites. The adsorption capacities of all organic cations followed the order of CLI > CaY > CaX > CaA > NaY > NaX > NaA and increased with the increase of Si/Al molar ratio in zeolite structure. This modification resulted in an alteration in the surface property of zeolites - it changed from hydrophilic to hydrophobic. The adsorption of selected pesticides with different hydrophobicity on surfactant-modified zeolites was studied. It is shown that surfactant-modified zeolites can be used for removal of pesticides from the environment. The increase in hydrophobicity of pesticides resulted in an increase in pesticide adsorption on SDMBA and DSDMA modified zeolites.
PB  - Trans Tech Publications Ltd, Durnten-Zurich
T2  - Recent Developments in Advanced Materials and Processes
T1  - Improved materials for environmental application: Surfactant-modified zeolites
EP  - 228
SP  - 223
VL  - 518
DO  - 10.4028/www.scientific.net/MSF.518.223
UR  - conv_515
ER  - 

@article{
author = "Jovanović, V. and Dondur, Vera and Damjanović, Lj. and Zakrzewska, J. and Tomašević-Čanović, Magdalena",
year = "2006",
abstract = "The surface properties of zeolites A, X, Y and natural zeolite clinoptilolite (CLI) functionalized by cationic surfactants were investigated. The quaternary ammonium type surfactants, such as hexadecyltrimethylammonium (HDTMA) chloride, stearildimethylbenzylammonium (SDMBA) chloride and distearildimethylammonium (DSDMA) chloride, replaced inorganic cations like Na+ and Ca2+ on the external surface of zeolites. The adsorption capacities of all organic cations followed the order of CLI > CaY > CaX > CaA > NaY > NaX > NaA and increased with the increase of Si/Al molar ratio in zeolite structure. This modification resulted in an alteration in the surface property of zeolites - it changed from hydrophilic to hydrophobic. The adsorption of selected pesticides with different hydrophobicity on surfactant-modified zeolites was studied. It is shown that surfactant-modified zeolites can be used for removal of pesticides from the environment. The increase in hydrophobicity of pesticides resulted in an increase in pesticide adsorption on SDMBA and DSDMA modified zeolites.",
publisher = "Trans Tech Publications Ltd, Durnten-Zurich",
journal = "Recent Developments in Advanced Materials and Processes",
title = "Improved materials for environmental application: Surfactant-modified zeolites",
pages = "228-223",
volume = "518",
doi = "10.4028/www.scientific.net/MSF.518.223",
url = "conv_515"
}

Jovanović, V., Dondur, V., Damjanović, Lj., Zakrzewska, J.,& Tomašević-Čanović, M.. (2006). Improved materials for environmental application: Surfactant-modified zeolites. in Recent Developments in Advanced Materials and Processes
Trans Tech Publications Ltd, Durnten-Zurich., 518, 223-228.
https://doi.org/10.4028/www.scientific.net/MSF.518.223
conv_515

Jovanović V, Dondur V, Damjanović L, Zakrzewska J, Tomašević-Čanović M. Improved materials for environmental application: Surfactant-modified zeolites. in Recent Developments in Advanced Materials and Processes. 2006;518:223-228.
doi:10.4028/www.scientific.net/MSF.518.223
conv_515 .

Jovanović, V., Dondur, Vera, Damjanović, Lj., Zakrzewska, J., Tomašević-Čanović, Magdalena, "Improved materials for environmental application: Surfactant-modified zeolites" in Recent Developments in Advanced Materials and Processes, 518 (2006):223-228,
https://doi.org/10.4028/www.scientific.net/MSF.518.223 .,
conv_515 .

TY  - JOUR
AU  - Daković, Aleksandra
AU  - Tomašević-Čanović, Magdalena
AU  - Dondur, Vera
AU  - Rottinghaus, George E.
AU  - Medaković, V
AU  - Zarić, Snežana
PY  - 2005
UR  - https://ritnms.itnms.ac.rs/handle/123456789/81
AB  - Adsorption of zearalenone (ZEN), ochratoxin A (OCHRA) and aflatoxin B1 (AFB1) on natural zeolite, clinoptilolite, modified with different amounts of octadecyldimethylbenzyl ammonium (ODMBA) ions was investigated. Results showed that adsorption of hydrophobic ionizable ZEN on unmodified zeolite tuff was very low and that adsorption on organozeolites increased with increasing hydrophobicity of the zeolitic surface. The adsorption was independent of the form of ZEN in solution and the solution pH, indicating that hydrophobic interactions with ODMBA are responsible for ZEN adsorption. Adsorption of low polar ionizable OCHRA on organozeolites also increased with increasing hydrophobicity of the zeolitic surface, however, OCHRA showed moderate adsorption on unmodified zeolitic tuff at pH 3. OCHRA adsorption on unmodified zeolite as well as on lower surface coverage of organozeolite was dependent on the form of OCHRA in solution; there was a decrease of adsorption at high pH, where OCHRA is in the anionic form. It indicated that at acidic pH, low surface coverage allows some combination of hydrophobic interaction with ODMBA and interactions with the surface of the zeolite. At higher surface coverage, the OCHRA adsorption was higher and practically independent of pH, indicating that the hydrophobic interactions of OCHRA with ODMBA are responsible for its adsorption. Nonionizable low polar AFB1 had a high affinity for the unmodified zeolitic tuff and the adsorption of AFB1 was greatly reduced for organozeolites, indicating that AFB1 does not have high tendency for hydrophobic interactions with ODMBA. pH dependence of AFB1 adsorption, while AFB1 has the same form at all pHs, demonstrated that the surface modification of the zeolite depends on pH and that these modifications have influence on its adsorption. The calculated dipole moments of neutral mycotoxin molecules: AFB1-9.5D, OCHRA-6.9D and ZEN-2.2D are in qualitative agreement with adsorption experimental data.
PB  - Elsevier, Amsterdam
T2  - Colloids and Surfaces B-Biointerfaces
T1  - Adsorption of mycotoxins by organozeolites
EP  - 25
IS  - 1
SP  - 20
VL  - 46
DO  - 10.1016/j.colsurfb.2005.08.013
UR  - conv_506
ER  - 

@article{
author = "Daković, Aleksandra and Tomašević-Čanović, Magdalena and Dondur, Vera and Rottinghaus, George E. and Medaković, V and Zarić, Snežana",
year = "2005",
abstract = "Adsorption of zearalenone (ZEN), ochratoxin A (OCHRA) and aflatoxin B1 (AFB1) on natural zeolite, clinoptilolite, modified with different amounts of octadecyldimethylbenzyl ammonium (ODMBA) ions was investigated. Results showed that adsorption of hydrophobic ionizable ZEN on unmodified zeolite tuff was very low and that adsorption on organozeolites increased with increasing hydrophobicity of the zeolitic surface. The adsorption was independent of the form of ZEN in solution and the solution pH, indicating that hydrophobic interactions with ODMBA are responsible for ZEN adsorption. Adsorption of low polar ionizable OCHRA on organozeolites also increased with increasing hydrophobicity of the zeolitic surface, however, OCHRA showed moderate adsorption on unmodified zeolitic tuff at pH 3. OCHRA adsorption on unmodified zeolite as well as on lower surface coverage of organozeolite was dependent on the form of OCHRA in solution; there was a decrease of adsorption at high pH, where OCHRA is in the anionic form. It indicated that at acidic pH, low surface coverage allows some combination of hydrophobic interaction with ODMBA and interactions with the surface of the zeolite. At higher surface coverage, the OCHRA adsorption was higher and practically independent of pH, indicating that the hydrophobic interactions of OCHRA with ODMBA are responsible for its adsorption. Nonionizable low polar AFB1 had a high affinity for the unmodified zeolitic tuff and the adsorption of AFB1 was greatly reduced for organozeolites, indicating that AFB1 does not have high tendency for hydrophobic interactions with ODMBA. pH dependence of AFB1 adsorption, while AFB1 has the same form at all pHs, demonstrated that the surface modification of the zeolite depends on pH and that these modifications have influence on its adsorption. The calculated dipole moments of neutral mycotoxin molecules: AFB1-9.5D, OCHRA-6.9D and ZEN-2.2D are in qualitative agreement with adsorption experimental data.",
publisher = "Elsevier, Amsterdam",
journal = "Colloids and Surfaces B-Biointerfaces",
title = "Adsorption of mycotoxins by organozeolites",
pages = "25-20",
number = "1",
volume = "46",
doi = "10.1016/j.colsurfb.2005.08.013",
url = "conv_506"
}

Daković, A., Tomašević-Čanović, M., Dondur, V., Rottinghaus, G. E., Medaković, V.,& Zarić, S.. (2005). Adsorption of mycotoxins by organozeolites. in Colloids and Surfaces B-Biointerfaces
Elsevier, Amsterdam., 46(1), 20-25.
https://doi.org/10.1016/j.colsurfb.2005.08.013
conv_506

Daković A, Tomašević-Čanović M, Dondur V, Rottinghaus GE, Medaković V, Zarić S. Adsorption of mycotoxins by organozeolites. in Colloids and Surfaces B-Biointerfaces. 2005;46(1):20-25.
doi:10.1016/j.colsurfb.2005.08.013
conv_506 .

Daković, Aleksandra, Tomašević-Čanović, Magdalena, Dondur, Vera, Rottinghaus, George E., Medaković, V, Zarić, Snežana, "Adsorption of mycotoxins by organozeolites" in Colloids and Surfaces B-Biointerfaces, 46, no. 1 (2005):20-25,
https://doi.org/10.1016/j.colsurfb.2005.08.013 .,
conv_506 .

TY  - JOUR
AU  - Radosavljević-Mihajlović, Ana
AU  - Dondur, Vera
AU  - Daković, Aleksandra
AU  - Lemić, Jovan
AU  - Tomašević-Čanović, Magdalena
PY  - 2004
UR  - https://ritnms.itnms.ac.rs/handle/123456789/63
AB  - Uzorci prirodnog zeolita (HEU-tipa) iz ležišta Novakovići – klinoptilolit- Ca (u blizini Prijedora, Bosna i Hercegovina), modifikovani su različitim koncentracijama hlorovodonične kiseline (od 10-3 M do 2 M), a u cilju određivanja njihovih fizičkohemijskih i strukturnih osobina. Za praćenje strukturnih promena u kiselinski modifikovanim probama, korišćene su sledeće metode: hemijska analiza, rendgen- difrakciona analiza praha, infracrvena spektroskopska analiza. Utvrđeno je prisustvo rastvornog jona aluminijuma pri koncentracijama većim od 10-1 M, što ukazuje na proces dealuminacije. Rezultati dobijeni rendgen-difrakcionom analizom praha modifikovanih proba ukazuju da pri većim koncentracijama od 1Mhlorovodonične kiseline, dolazi do značajnih strukturnih promena i smanjenja uređenosti kristalne strukture (60–70 %). Takođe, rezultati dobijeni infracrvenom spektroskopijom, potvrdili su delimičnu amorfizaciju zeolitskog tufa, koja se dešava kiselinskom modifikacijom pri velikim koncentracijama hlorovodonične kiseline (> 1 M).
AB  - Samples of natural HEU-type zeolites – clinoptilolite-Ca, from the Novakovici deposit (near Prijedor, Bosnia and Herzegovina) were treated with the hydrochloric acid of various concentrations (from 10-3Mto 2M). Zeolitic tuffs before and after the acid treatment were examined using IR, XRPD, and chemical analyses. The changes in the crystal structure of acid treated samples showed a significant reduction in the crystallinity of zeolitic tuffs (60–70 %), which were effected by hydrochloric acid with concentrations of 1 M and above.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Fizičkohemijske i strukturne osobine kiselinski modifikovanog zeolitskog tufa - heu-tip zeolit
T1  - Physicochemical and structural characteristics of HEU-type zeolitic tuff treated by hydrochloric acid
EP  - 281
IS  - 4
SP  - 273
VL  - 69
DO  - 10.2298/JSC0404273R
UR  - conv_490
ER  - 

@article{
author = "Radosavljević-Mihajlović, Ana and Dondur, Vera and Daković, Aleksandra and Lemić, Jovan and Tomašević-Čanović, Magdalena",
year = "2004",
abstract = "Uzorci prirodnog zeolita (HEU-tipa) iz ležišta Novakovići – klinoptilolit- Ca (u blizini Prijedora, Bosna i Hercegovina), modifikovani su različitim koncentracijama hlorovodonične kiseline (od 10-3 M do 2 M), a u cilju određivanja njihovih fizičkohemijskih i strukturnih osobina. Za praćenje strukturnih promena u kiselinski modifikovanim probama, korišćene su sledeće metode: hemijska analiza, rendgen- difrakciona analiza praha, infracrvena spektroskopska analiza. Utvrđeno je prisustvo rastvornog jona aluminijuma pri koncentracijama većim od 10-1 M, što ukazuje na proces dealuminacije. Rezultati dobijeni rendgen-difrakcionom analizom praha modifikovanih proba ukazuju da pri većim koncentracijama od 1Mhlorovodonične kiseline, dolazi do značajnih strukturnih promena i smanjenja uređenosti kristalne strukture (60–70 %). Takođe, rezultati dobijeni infracrvenom spektroskopijom, potvrdili su delimičnu amorfizaciju zeolitskog tufa, koja se dešava kiselinskom modifikacijom pri velikim koncentracijama hlorovodonične kiseline (> 1 M)., Samples of natural HEU-type zeolites – clinoptilolite-Ca, from the Novakovici deposit (near Prijedor, Bosnia and Herzegovina) were treated with the hydrochloric acid of various concentrations (from 10-3Mto 2M). Zeolitic tuffs before and after the acid treatment were examined using IR, XRPD, and chemical analyses. The changes in the crystal structure of acid treated samples showed a significant reduction in the crystallinity of zeolitic tuffs (60–70 %), which were effected by hydrochloric acid with concentrations of 1 M and above.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Fizičkohemijske i strukturne osobine kiselinski modifikovanog zeolitskog tufa - heu-tip zeolit, Physicochemical and structural characteristics of HEU-type zeolitic tuff treated by hydrochloric acid",
pages = "281-273",
number = "4",
volume = "69",
doi = "10.2298/JSC0404273R",
url = "conv_490"
}

Radosavljević-Mihajlović, A., Dondur, V., Daković, A., Lemić, J.,& Tomašević-Čanović, M.. (2004). Fizičkohemijske i strukturne osobine kiselinski modifikovanog zeolitskog tufa - heu-tip zeolit. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 69(4), 273-281.
https://doi.org/10.2298/JSC0404273R
conv_490

Radosavljević-Mihajlović A, Dondur V, Daković A, Lemić J, Tomašević-Čanović M. Fizičkohemijske i strukturne osobine kiselinski modifikovanog zeolitskog tufa - heu-tip zeolit. in Journal of the Serbian Chemical Society. 2004;69(4):273-281.
doi:10.2298/JSC0404273R
conv_490 .

Radosavljević-Mihajlović, Ana, Dondur, Vera, Daković, Aleksandra, Lemić, Jovan, Tomašević-Čanović, Magdalena, "Fizičkohemijske i strukturne osobine kiselinski modifikovanog zeolitskog tufa - heu-tip zeolit" in Journal of the Serbian Chemical Society, 69, no. 4 (2004):273-281,
https://doi.org/10.2298/JSC0404273R .,
conv_490 .

TY  - JOUR
AU  - Daković, Aleksandra
AU  - Tomašević-Čanović, Magdalena
AU  - Rottinghaus, George E.
AU  - Dondur, Vera
AU  - Masić, Z
PY  - 2003
UR  - https://ritnms.itnms.ac.rs/handle/123456789/57
AB  - The in vitro adsorption of ochratoxin A (OCHRA) by clinoptilolite-heulandite rich tuff modified with different amounts -20, 50 and 100 mumol M+/g of octadecyldimethyl benzyl ammonium (ODMBA) ion was investigated. The organo-zeolites were denoted as OZ-2, OZ-5 and OZ-10. The maximal amount of ODMBA in organo-zeolites 100 mumol M+/g was equal to external cation exchange capacity of starting material. Adsorption of OCHRA by unmodified zeolitic tuff was 40% at pH 3 and 3% at pH 7 and 9. OCHRA adsorption on organo-zeolites increased as the levels of ODMBA increased. At low coverage of zeolitic surface with ODMBA-organo-zeolite OZ-2, adsorption of OCHRA was lower at pH 7 and 9 than at pH 3. The decreased adsorption of OCHRA at pH 7 and 9 may be induced by the presence of anionic form of OCHRA which probably led to repulsion between the OCHRA and uncovered negative zeolitic surface. At higher coverage of the zeolitic surface, organo-zeolites OZ-5 and OZ-10, adsorption of OCHRA was pH independent. OCHRA adsorption on OZ-2 and OZ-10 showed non linear type of isotherm at pH 3, 7 and 9. Adsorption of OCHRA by OZ-5 followed a non linear type of isotherm at pH 7 and 9, while at pH 3 the adsorption was best represented by an S-shaped isotherm. Adsorption of OCHRA on organo-zeolites is dependent on the amount of organic cation at the surface, as well as on their surface concentration-arrangement of alkyl chains at the surface. At low surface concentration of ODMBA, adsorption of OCHRA may be dependent on the form of OCHRA in solution.
PB  - Elsevier, Amsterdam
T2  - Colloids and Surfaces B-Biointerfaces
T1  - Adsorption of ochratoxin A on octadecyldimethyl benzyl ammonium exchanged-clinoptilolite-heulandite tuff
EP  - 165
IS  - 1-2
SP  - 157
VL  - 30
DO  - 10.1016/S0927-7765(03)00067-5
UR  - conv_462
ER  - 

@article{
author = "Daković, Aleksandra and Tomašević-Čanović, Magdalena and Rottinghaus, George E. and Dondur, Vera and Masić, Z",
year = "2003",
abstract = "The in vitro adsorption of ochratoxin A (OCHRA) by clinoptilolite-heulandite rich tuff modified with different amounts -20, 50 and 100 mumol M+/g of octadecyldimethyl benzyl ammonium (ODMBA) ion was investigated. The organo-zeolites were denoted as OZ-2, OZ-5 and OZ-10. The maximal amount of ODMBA in organo-zeolites 100 mumol M+/g was equal to external cation exchange capacity of starting material. Adsorption of OCHRA by unmodified zeolitic tuff was 40% at pH 3 and 3% at pH 7 and 9. OCHRA adsorption on organo-zeolites increased as the levels of ODMBA increased. At low coverage of zeolitic surface with ODMBA-organo-zeolite OZ-2, adsorption of OCHRA was lower at pH 7 and 9 than at pH 3. The decreased adsorption of OCHRA at pH 7 and 9 may be induced by the presence of anionic form of OCHRA which probably led to repulsion between the OCHRA and uncovered negative zeolitic surface. At higher coverage of the zeolitic surface, organo-zeolites OZ-5 and OZ-10, adsorption of OCHRA was pH independent. OCHRA adsorption on OZ-2 and OZ-10 showed non linear type of isotherm at pH 3, 7 and 9. Adsorption of OCHRA by OZ-5 followed a non linear type of isotherm at pH 7 and 9, while at pH 3 the adsorption was best represented by an S-shaped isotherm. Adsorption of OCHRA on organo-zeolites is dependent on the amount of organic cation at the surface, as well as on their surface concentration-arrangement of alkyl chains at the surface. At low surface concentration of ODMBA, adsorption of OCHRA may be dependent on the form of OCHRA in solution.",
publisher = "Elsevier, Amsterdam",
journal = "Colloids and Surfaces B-Biointerfaces",
title = "Adsorption of ochratoxin A on octadecyldimethyl benzyl ammonium exchanged-clinoptilolite-heulandite tuff",
pages = "165-157",
number = "1-2",
volume = "30",
doi = "10.1016/S0927-7765(03)00067-5",
url = "conv_462"
}

Daković, A., Tomašević-Čanović, M., Rottinghaus, G. E., Dondur, V.,& Masić, Z.. (2003). Adsorption of ochratoxin A on octadecyldimethyl benzyl ammonium exchanged-clinoptilolite-heulandite tuff. in Colloids and Surfaces B-Biointerfaces
Elsevier, Amsterdam., 30(1-2), 157-165.
https://doi.org/10.1016/S0927-7765(03)00067-5
conv_462

Daković A, Tomašević-Čanović M, Rottinghaus GE, Dondur V, Masić Z. Adsorption of ochratoxin A on octadecyldimethyl benzyl ammonium exchanged-clinoptilolite-heulandite tuff. in Colloids and Surfaces B-Biointerfaces. 2003;30(1-2):157-165.
doi:10.1016/S0927-7765(03)00067-5
conv_462 .

Daković, Aleksandra, Tomašević-Čanović, Magdalena, Rottinghaus, George E., Dondur, Vera, Masić, Z, "Adsorption of ochratoxin A on octadecyldimethyl benzyl ammonium exchanged-clinoptilolite-heulandite tuff" in Colloids and Surfaces B-Biointerfaces, 30, no. 1-2 (2003):157-165,
https://doi.org/10.1016/S0927-7765(03)00067-5 .,
conv_462 .

TY  - JOUR
AU  - Vujaković, Aleksandra
AU  - Tomašević-Čanović, Magdalena
AU  - Daković, Aleksandra
AU  - Dondur, Vera
PY  - 2000
UR  - https://ritnms.itnms.ac.rs/handle/123456789/28
AB  - The adsorption of sulphate, hydrogenchromate and dihydrogenphosphate anions on surfactant-modified clinoptilolite (SMC) was investigated. The SMCs were prepared by the adsorption of cis-1-aminoctadecen-9 (oleylamine) on both modified and unmodified natural clinoptilolite tuff. The properties of the modified clinoptilolite samples, such as cation type, structure of the zeolite framework and ECEC value, determined the mechanism of oleylamine adsorption, and consequently anion adsorption on the external clinoptilolite surface. According to the strength of the anion adsorption, two groups of SMCs could be distinguished: strong and weak anion adsorbents. Strong anion adsorbents were obtained by oleylamine adsorption on H+-clinoptilolites by protonation of the -NH2 groups. This mechanism of oleylamine adsorption resulted in the surface precipitation mechanism of anion adsorption being the dominant mechanism. The oleylamine derivatives of Ca- and Na-clinoptilolite were weak anion adsorbents. Oleylamine is adsorbed on Ca- and Na-clinoptilolite by hydrogen bonding, thus yielding insufficient adsorption sites fur anions. Hydrogenchromate and dihydrogenphosphate anions were nevertheless adsorbed on these SMCs by interaction with oleylamine. The experiments of anion adsorption on various oleylamine loaded SMCs confirmed the existence of two types of anion adsorption sites and showed that excess oleylamine did not significantly influence the anion adsorption in the investigated concentration range. The kinetic results showed that SO42- and H2PO4- adsorptions were slow processes while HCrO4- adsorption was completed in a few minutes,
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Clay Science
T1  - The adsorption of sulphate, hydrogenchromate and dihydrogenphosphate anions on surfactant-modified clinoptilolite
EP  - 277
IS  - 5-6
SP  - 265
VL  - 17
DO  - 10.1016/S0169-1317(00)00019-3
UR  - conv_451
ER  - 

@article{
author = "Vujaković, Aleksandra and Tomašević-Čanović, Magdalena and Daković, Aleksandra and Dondur, Vera",
year = "2000",
abstract = "The adsorption of sulphate, hydrogenchromate and dihydrogenphosphate anions on surfactant-modified clinoptilolite (SMC) was investigated. The SMCs were prepared by the adsorption of cis-1-aminoctadecen-9 (oleylamine) on both modified and unmodified natural clinoptilolite tuff. The properties of the modified clinoptilolite samples, such as cation type, structure of the zeolite framework and ECEC value, determined the mechanism of oleylamine adsorption, and consequently anion adsorption on the external clinoptilolite surface. According to the strength of the anion adsorption, two groups of SMCs could be distinguished: strong and weak anion adsorbents. Strong anion adsorbents were obtained by oleylamine adsorption on H+-clinoptilolites by protonation of the -NH2 groups. This mechanism of oleylamine adsorption resulted in the surface precipitation mechanism of anion adsorption being the dominant mechanism. The oleylamine derivatives of Ca- and Na-clinoptilolite were weak anion adsorbents. Oleylamine is adsorbed on Ca- and Na-clinoptilolite by hydrogen bonding, thus yielding insufficient adsorption sites fur anions. Hydrogenchromate and dihydrogenphosphate anions were nevertheless adsorbed on these SMCs by interaction with oleylamine. The experiments of anion adsorption on various oleylamine loaded SMCs confirmed the existence of two types of anion adsorption sites and showed that excess oleylamine did not significantly influence the anion adsorption in the investigated concentration range. The kinetic results showed that SO42- and H2PO4- adsorptions were slow processes while HCrO4- adsorption was completed in a few minutes,",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Clay Science",
title = "The adsorption of sulphate, hydrogenchromate and dihydrogenphosphate anions on surfactant-modified clinoptilolite",
pages = "277-265",
number = "5-6",
volume = "17",
doi = "10.1016/S0169-1317(00)00019-3",
url = "conv_451"
}

Vujaković, A., Tomašević-Čanović, M., Daković, A.,& Dondur, V.. (2000). The adsorption of sulphate, hydrogenchromate and dihydrogenphosphate anions on surfactant-modified clinoptilolite. in Applied Clay Science
Elsevier Science Bv, Amsterdam., 17(5-6), 265-277.
https://doi.org/10.1016/S0169-1317(00)00019-3
conv_451

Vujaković A, Tomašević-Čanović M, Daković A, Dondur V. The adsorption of sulphate, hydrogenchromate and dihydrogenphosphate anions on surfactant-modified clinoptilolite. in Applied Clay Science. 2000;17(5-6):265-277.
doi:10.1016/S0169-1317(00)00019-3
conv_451 .

Vujaković, Aleksandra, Tomašević-Čanović, Magdalena, Daković, Aleksandra, Dondur, Vera, "The adsorption of sulphate, hydrogenchromate and dihydrogenphosphate anions on surfactant-modified clinoptilolite" in Applied Clay Science, 17, no. 5-6 (2000):265-277,
https://doi.org/10.1016/S0169-1317(00)00019-3 .,
conv_451 .

TY  - JOUR
AU  - Daković, Aleksandra
AU  - Tomašević-Čanović, Magdalena
AU  - Dondur, Vera
AU  - Vujaković, Aleksandra
AU  - Radošević, Predrag
PY  - 2000
UR  - https://ritnms.itnms.ac.rs/handle/123456789/26
AB  - Praćena je kinetika adsorpcije aflatoksina B1 i G2 na Ca-klinoptilolitu, u vodenom rastvoru elektrolita, na pH 2 i pH 7 i na temperaturi 37 °C. Dobijeni rezultati pokazuju da proces adsorpcije oba toksina započinje brzom reakcijom i da se najveći deo toksina adsorbuje u prvih nekoliko minuta. Posle ovog brzog procesa sledi znatno sporiji proces u kome se nastavlja vezivanje toksina za aktivne centre mineralnog adsorbenta. Pokazano je metodom početnih brzina da je brzi proces adsorpcije oba toksina reakcija prvog reda, dok je spori proces reakcija nultog reda. Indeksi adsorpcije i brzine adsorpcije zavise od pH sredine. U ispitivanom opsegu koncentracija (500-3000 μg/dm3 postignuti su visoki indeksi adsorpcije kako aflatoksina B1 tako i aflatoksina G2 (> 80%).
AB  - The kinetics of aflatoxins B1 and G2 adsorption on Ca-clinoptilolite at pH 2 and 7, in aqueous electrolyte at 37 °C were studied. For both aflatoxins, the adsorption process begins with a fast reaction whereby most of the toxin is adsorbed in the first few minutes. This fast process is followed by the significantly slower process of aflatoxin bonding at active centers of mineral adsorbent. The initial rate method showed that the fast adsorption process of aflatoxin B1 and G2, at both pH values is a first order reaction, while the slow adsorption process of these aflatoxins is a zero order reaction. The adsorption indexes and adsorption rates for both examined toxins were pH dependent. In the investigated initial toxins concentration ranges (500-3000 μg/dm3), high adsorption indexes were achieved (> 80 %).
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Kinetika adsorpcije aflatoksina B1 i G2 na Ca-klinoptilolitu
T1  - Kinetics of aflatoxin B1 and G2 adsorption on Ca-clinoptilolite
EP  - 723
IS  - 10
SP  - 715
VL  - 65
DO  - 10.2298/JSC0010715D
UR  - conv_450
ER  - 

@article{
author = "Daković, Aleksandra and Tomašević-Čanović, Magdalena and Dondur, Vera and Vujaković, Aleksandra and Radošević, Predrag",
year = "2000",
abstract = "Praćena je kinetika adsorpcije aflatoksina B1 i G2 na Ca-klinoptilolitu, u vodenom rastvoru elektrolita, na pH 2 i pH 7 i na temperaturi 37 °C. Dobijeni rezultati pokazuju da proces adsorpcije oba toksina započinje brzom reakcijom i da se najveći deo toksina adsorbuje u prvih nekoliko minuta. Posle ovog brzog procesa sledi znatno sporiji proces u kome se nastavlja vezivanje toksina za aktivne centre mineralnog adsorbenta. Pokazano je metodom početnih brzina da je brzi proces adsorpcije oba toksina reakcija prvog reda, dok je spori proces reakcija nultog reda. Indeksi adsorpcije i brzine adsorpcije zavise od pH sredine. U ispitivanom opsegu koncentracija (500-3000 μg/dm3 postignuti su visoki indeksi adsorpcije kako aflatoksina B1 tako i aflatoksina G2 (> 80%)., The kinetics of aflatoxins B1 and G2 adsorption on Ca-clinoptilolite at pH 2 and 7, in aqueous electrolyte at 37 °C were studied. For both aflatoxins, the adsorption process begins with a fast reaction whereby most of the toxin is adsorbed in the first few minutes. This fast process is followed by the significantly slower process of aflatoxin bonding at active centers of mineral adsorbent. The initial rate method showed that the fast adsorption process of aflatoxin B1 and G2, at both pH values is a first order reaction, while the slow adsorption process of these aflatoxins is a zero order reaction. The adsorption indexes and adsorption rates for both examined toxins were pH dependent. In the investigated initial toxins concentration ranges (500-3000 μg/dm3), high adsorption indexes were achieved (> 80 %).",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Kinetika adsorpcije aflatoksina B1 i G2 na Ca-klinoptilolitu, Kinetics of aflatoxin B1 and G2 adsorption on Ca-clinoptilolite",
pages = "723-715",
number = "10",
volume = "65",
doi = "10.2298/JSC0010715D",
url = "conv_450"
}

Daković, A., Tomašević-Čanović, M., Dondur, V., Vujaković, A.,& Radošević, P.. (2000). Kinetika adsorpcije aflatoksina B1 i G2 na Ca-klinoptilolitu. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 65(10), 715-723.
https://doi.org/10.2298/JSC0010715D
conv_450

Daković A, Tomašević-Čanović M, Dondur V, Vujaković A, Radošević P. Kinetika adsorpcije aflatoksina B1 i G2 na Ca-klinoptilolitu. in Journal of the Serbian Chemical Society. 2000;65(10):715-723.
doi:10.2298/JSC0010715D
conv_450 .

Daković, Aleksandra, Tomašević-Čanović, Magdalena, Dondur, Vera, Vujaković, Aleksandra, Radošević, Predrag, "Kinetika adsorpcije aflatoksina B1 i G2 na Ca-klinoptilolitu" in Journal of the Serbian Chemical Society, 65, no. 10 (2000):715-723,
https://doi.org/10.2298/JSC0010715D .,
conv_450 .