TY  - JOUR
AU  - Lemić, Jovan
AU  - Tomašević-Čanović, Magdalena
AU  - Adamović, Milan
AU  - Kovačević, Dragana
AU  - Milićević, Sonja
PY  - 2007
UR  - https://ritnms.itnms.ac.rs/handle/123456789/118
AB  - Sorption of polycyclic aromatic hydrocarbons on organo-zeolites was investigated to determine sorbent-sorbate interaction. The hydrophobic character of the surface of the organo-zeolites was studied using in water vapor adsorption experiments. Water adsorption decreased with increasing stearyldimethylbenzylammoniumchloride (SDBAC) loading up to 75 mmol/kg, which is related to increasing sorbate hydrophobicity. With loadings above 75 mmol/kg (ECEC value), water vapor adsorption increased. Effects of adsorbent size, SDBAC loading and initial concentration of PAHs on the adsorption efficiency were also determined. The highest adsorption for the PAHs studied was achieved with OZ II 75 (OZ - organo-zeolite; II - particle size of 0.4-0.8 mm; 75 - mmol of surfactant/kg of zeolite). At a concentration of 20 mu g/dm(3) the adsorption index for benz[a]anthracene was 100%. The smaller adsorption indexes for PAHs with lower partition coefficients, K-ow, indicated that the adsorption is primarily hydrophobic. The number of bed volumes passed through the adsorbent before the first PAH appeared in the effluent was 770. Column experiments showed competitive adsorption among the PAHs with different hydrophobicities.
PB  - Elsevier, Amsterdam
T2  - Microporous and Mesoporous Materials
T1  - Competitive adsorption of polycyclic aromatic hydrocarbons on organo-zeolites
EP  - 323
IS  - 3
SP  - 317
VL  - 105
DO  - 10.1016/j.micromeso.2007.04.014
UR  - conv_535
ER  - 

@article{
author = "Lemić, Jovan and Tomašević-Čanović, Magdalena and Adamović, Milan and Kovačević, Dragana and Milićević, Sonja",
year = "2007",
abstract = "Sorption of polycyclic aromatic hydrocarbons on organo-zeolites was investigated to determine sorbent-sorbate interaction. The hydrophobic character of the surface of the organo-zeolites was studied using in water vapor adsorption experiments. Water adsorption decreased with increasing stearyldimethylbenzylammoniumchloride (SDBAC) loading up to 75 mmol/kg, which is related to increasing sorbate hydrophobicity. With loadings above 75 mmol/kg (ECEC value), water vapor adsorption increased. Effects of adsorbent size, SDBAC loading and initial concentration of PAHs on the adsorption efficiency were also determined. The highest adsorption for the PAHs studied was achieved with OZ II 75 (OZ - organo-zeolite; II - particle size of 0.4-0.8 mm; 75 - mmol of surfactant/kg of zeolite). At a concentration of 20 mu g/dm(3) the adsorption index for benz[a]anthracene was 100%. The smaller adsorption indexes for PAHs with lower partition coefficients, K-ow, indicated that the adsorption is primarily hydrophobic. The number of bed volumes passed through the adsorbent before the first PAH appeared in the effluent was 770. Column experiments showed competitive adsorption among the PAHs with different hydrophobicities.",
publisher = "Elsevier, Amsterdam",
journal = "Microporous and Mesoporous Materials",
title = "Competitive adsorption of polycyclic aromatic hydrocarbons on organo-zeolites",
pages = "323-317",
number = "3",
volume = "105",
doi = "10.1016/j.micromeso.2007.04.014",
url = "conv_535"
}

Lemić, J., Tomašević-Čanović, M., Adamović, M., Kovačević, D.,& Milićević, S.. (2007). Competitive adsorption of polycyclic aromatic hydrocarbons on organo-zeolites. in Microporous and Mesoporous Materials
Elsevier, Amsterdam., 105(3), 317-323.
https://doi.org/10.1016/j.micromeso.2007.04.014
conv_535

Lemić J, Tomašević-Čanović M, Adamović M, Kovačević D, Milićević S. Competitive adsorption of polycyclic aromatic hydrocarbons on organo-zeolites. in Microporous and Mesoporous Materials. 2007;105(3):317-323.
doi:10.1016/j.micromeso.2007.04.014
conv_535 .

Lemić, Jovan, Tomašević-Čanović, Magdalena, Adamović, Milan, Kovačević, Dragana, Milićević, Sonja, "Competitive adsorption of polycyclic aromatic hydrocarbons on organo-zeolites" in Microporous and Mesoporous Materials, 105, no. 3 (2007):317-323,
https://doi.org/10.1016/j.micromeso.2007.04.014 .,
conv_535 .

TY  - JOUR
AU  - Branković, Anđelka
AU  - Tešmanović, Ljiljana
AU  - Zildžović, Snežana
AU  - Kovačević, Dragana
AU  - Ileš, Deana
PY  - 2007
UR  - https://ritnms.itnms.ac.rs/handle/123456789/111
AB  - Arsen se pojavljuje kao prateći element sulfidnih ruda ležišta gvožđa, olova i drugih metala. Njegovo prisustvo u rudama je katkad u dovoljnim količinama da je ekonomski opravdano razmišljati o njegovoj eksploataciji. Kao toksičan element i u veoma malim količinama degradira kvalitet rude, na primer olovo-cinkane rude ili rude zeolita. U mnogim geološko-geohemijskim sistemima je prisutan arsen, koji predstavlja rizik za kvalitet životne sredine. Ispitivan je uticaj različitih postupaka hemijskog razlaganja uzorka mineralne sirovine na određivanje arsena, metodom AAS-MHS, sa ciljem da se na bazi eksperimentalnih rezultata, odabere najoptimalniji. Postupak treba da omogući efikasno hemijsko razlaganje uzorka, odnosno transformaciju iz čvrstog u tečno i potpunu jonizaciju migrirajućeg atoma ili jona arsena, što predstavlja osnovu za njegovo kvantitativno određivanje. U eksperimentima je korišćen prirodni zeolit i njemu identična po hemijskom sastavu napravljena smeša (kao referentni materijal) sa određenom koncentracijom arsena. Najoptimalniji način hemijskog razlaganja može, prioritetno i uspešnije, da se primeni i na druge mineralne sirovine i jalovine u koji ma se određuje arsen.
AB  - Arsenic occurs as a concomitant element of sulfide iron, lead and other metallic ores. The presence of arsenic in ores is sometimes in the quantities sufficient to be economically feasible. As a toxic element, even in the small quantities, arsenic degrades the quality of the ore, for example the lead-zinc or zeolite ore. Moreover, the arsenic is present in many geological-geochemical systems, representing the considerable risk for the quality of the environment. The objective of this paper is to present the results of the investigation aimed to evaluate the influence of different procedures applied for chemical destruction of mineral raw material on arsenic determination, using AAS-MHS method and selection of the optimal sample preparation procedure. The selected procedure should provide the efficient destruction of the sample, meaning transformation from solids to liquid, and total ionization of migrating atom or ion of arsenic, which is the basis for its quantitative determination. Natural zeolite ore and chemically identical zeolite mixture (reference material), with the adequate concentration of arsenic were used in the experimental work. The most appropriate procedure for chemical destruction can be preferentially and successfully applied also to the other mineral materials and tailings in which arsenic should be determined.
PB  - Naučno-stručno društvo za zaštitu životne sredine Srbije - Ecologica, Beograd
T2  - Ecologica
T1  - Određivanje arsena u rudama i jalovinama
T1  - The determination of arsenic in ores and tailings
EP  - 14
IS  - 49
SP  - 11
VL  - 14
UR  - conv_239
ER  - 

@article{
author = "Branković, Anđelka and Tešmanović, Ljiljana and Zildžović, Snežana and Kovačević, Dragana and Ileš, Deana",
year = "2007",
abstract = "Arsen se pojavljuje kao prateći element sulfidnih ruda ležišta gvožđa, olova i drugih metala. Njegovo prisustvo u rudama je katkad u dovoljnim količinama da je ekonomski opravdano razmišljati o njegovoj eksploataciji. Kao toksičan element i u veoma malim količinama degradira kvalitet rude, na primer olovo-cinkane rude ili rude zeolita. U mnogim geološko-geohemijskim sistemima je prisutan arsen, koji predstavlja rizik za kvalitet životne sredine. Ispitivan je uticaj različitih postupaka hemijskog razlaganja uzorka mineralne sirovine na određivanje arsena, metodom AAS-MHS, sa ciljem da se na bazi eksperimentalnih rezultata, odabere najoptimalniji. Postupak treba da omogući efikasno hemijsko razlaganje uzorka, odnosno transformaciju iz čvrstog u tečno i potpunu jonizaciju migrirajućeg atoma ili jona arsena, što predstavlja osnovu za njegovo kvantitativno određivanje. U eksperimentima je korišćen prirodni zeolit i njemu identična po hemijskom sastavu napravljena smeša (kao referentni materijal) sa određenom koncentracijom arsena. Najoptimalniji način hemijskog razlaganja može, prioritetno i uspešnije, da se primeni i na druge mineralne sirovine i jalovine u koji ma se određuje arsen., Arsenic occurs as a concomitant element of sulfide iron, lead and other metallic ores. The presence of arsenic in ores is sometimes in the quantities sufficient to be economically feasible. As a toxic element, even in the small quantities, arsenic degrades the quality of the ore, for example the lead-zinc or zeolite ore. Moreover, the arsenic is present in many geological-geochemical systems, representing the considerable risk for the quality of the environment. The objective of this paper is to present the results of the investigation aimed to evaluate the influence of different procedures applied for chemical destruction of mineral raw material on arsenic determination, using AAS-MHS method and selection of the optimal sample preparation procedure. The selected procedure should provide the efficient destruction of the sample, meaning transformation from solids to liquid, and total ionization of migrating atom or ion of arsenic, which is the basis for its quantitative determination. Natural zeolite ore and chemically identical zeolite mixture (reference material), with the adequate concentration of arsenic were used in the experimental work. The most appropriate procedure for chemical destruction can be preferentially and successfully applied also to the other mineral materials and tailings in which arsenic should be determined.",
publisher = "Naučno-stručno društvo za zaštitu životne sredine Srbije - Ecologica, Beograd",
journal = "Ecologica",
title = "Određivanje arsena u rudama i jalovinama, The determination of arsenic in ores and tailings",
pages = "14-11",
number = "49",
volume = "14",
url = "conv_239"
}

Branković, A., Tešmanović, L., Zildžović, S., Kovačević, D.,& Ileš, D.. (2007). Određivanje arsena u rudama i jalovinama. in Ecologica
Naučno-stručno društvo za zaštitu životne sredine Srbije - Ecologica, Beograd., 14(49), 11-14.
conv_239

Branković A, Tešmanović L, Zildžović S, Kovačević D, Ileš D. Određivanje arsena u rudama i jalovinama. in Ecologica. 2007;14(49):11-14.
conv_239 .

Branković, Anđelka, Tešmanović, Ljiljana, Zildžović, Snežana, Kovačević, Dragana, Ileš, Deana, "Određivanje arsena u rudama i jalovinama" in Ecologica, 14, no. 49 (2007):11-14,
conv_239 .

TY  - JOUR
AU  - Lemić, Jovan
AU  - Milošević, Siniša
AU  - Vukašinović, Marija
AU  - Radosavljević-Mihajlović, Ana
AU  - Kovačević, Dragana
PY  - 2006
UR  - https://ritnms.itnms.ac.rs/handle/123456789/104
AB  - Ispitivan je uticaj temperature na adsorpciju stearildimetilbenzil-amonijum-hlorida (SDBAH ) na prirodnom zeolitskom tufu. Maksimalna adsorbovana količina SDBAH iznosila je 123 mmol/kg zeolita u slučaju termičkog tretiranja zeolita (100°C) i zagrevanja rastvora SDBAH (80°C ). Način vezivanja između površinskog modifikatora i zeolita ispitan je metodama DTA, TG, DTG i IR analiza. Tokom postepenog zagrevanja u atmosferi vazduha, adsorbovana organska faza se oksiduje što se manifestuje egzotermnim pikovima na DTA krivama. Adsorpcija vodene pare opada sa porastom sadržaja organske faze do vrednosti 75 mmol/kg, što se može pripisati povećanju hidrofobnosti uzoraka organo-zeolita. Sa daljim povećanjem sadržaja organske faze, adsorpcija vodene pare je intenzivnija. U radu je ispitana desorpcija SDBAH sa organo-zeolita pri različitim pH vrednostima i jonskim jačinama vodenih rastvora. Rezultati su pokazali da su organo-zeoliti sa sadržajem SDBAH do vrednosti 75 mmol/kg zeolita stabilni u svim primenjenim uslovima.
AB  - The adsorption of stearyldimethylbenzylammonium chloride (SDBAC) on the clinoptilolite-heulandite rich tuff in dependence on the applied temperature was studied. The maximal amount of sorbed SDBAC was 123 mmol/kg in the case of thermally treated zeolite tuff (100°C) and a warm surfactant solution (80°C). The amount and properties of water adsorbed on the organo-zeolite (OZ) as well as the bonding between the organic species and the zeolite were investigated by DTA, TG, DTG and IR analyses. During gradual heating in an oxidizing atmosphere, the adsorbed organic material was oxidized, giving rise to significant exothermic peaks. The adsorption of water vapor decreased with increasing SDBAC loading up to 75 mmol/kg of zeolite, which can be ascribed to an intensification of the hydrophobic characteristics of the surface. With loadings above the 75 mmol/kg, the adsorption of water vapor increased. Desorption of SDBAC from the organo-zeolite under environmentally relevant conditions: distilled water, pH 3 and 10 buffers, as well as aqueous NaCl and CaCl2 solutions, was investigated. OZs with loadings up to their external cation exchange capacity value (75 mmol/kg) were stable under all of the applied conditions.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Površinska modifikacija zeolita i uticaj pH i jonske jačine na desorpciju amina
T1  - Surface modification of a zeolite and the influence of pH and ionic strength on the desorption of an amine
EP  - 1172
IS  - 11
SP  - 1161
VL  - 71
DO  - 10.2298/JSC0611161L
UR  - conv_521
ER  - 

@article{
author = "Lemić, Jovan and Milošević, Siniša and Vukašinović, Marija and Radosavljević-Mihajlović, Ana and Kovačević, Dragana",
year = "2006",
abstract = "Ispitivan je uticaj temperature na adsorpciju stearildimetilbenzil-amonijum-hlorida (SDBAH ) na prirodnom zeolitskom tufu. Maksimalna adsorbovana količina SDBAH iznosila je 123 mmol/kg zeolita u slučaju termičkog tretiranja zeolita (100°C) i zagrevanja rastvora SDBAH (80°C ). Način vezivanja između površinskog modifikatora i zeolita ispitan je metodama DTA, TG, DTG i IR analiza. Tokom postepenog zagrevanja u atmosferi vazduha, adsorbovana organska faza se oksiduje što se manifestuje egzotermnim pikovima na DTA krivama. Adsorpcija vodene pare opada sa porastom sadržaja organske faze do vrednosti 75 mmol/kg, što se može pripisati povećanju hidrofobnosti uzoraka organo-zeolita. Sa daljim povećanjem sadržaja organske faze, adsorpcija vodene pare je intenzivnija. U radu je ispitana desorpcija SDBAH sa organo-zeolita pri različitim pH vrednostima i jonskim jačinama vodenih rastvora. Rezultati su pokazali da su organo-zeoliti sa sadržajem SDBAH do vrednosti 75 mmol/kg zeolita stabilni u svim primenjenim uslovima., The adsorption of stearyldimethylbenzylammonium chloride (SDBAC) on the clinoptilolite-heulandite rich tuff in dependence on the applied temperature was studied. The maximal amount of sorbed SDBAC was 123 mmol/kg in the case of thermally treated zeolite tuff (100°C) and a warm surfactant solution (80°C). The amount and properties of water adsorbed on the organo-zeolite (OZ) as well as the bonding between the organic species and the zeolite were investigated by DTA, TG, DTG and IR analyses. During gradual heating in an oxidizing atmosphere, the adsorbed organic material was oxidized, giving rise to significant exothermic peaks. The adsorption of water vapor decreased with increasing SDBAC loading up to 75 mmol/kg of zeolite, which can be ascribed to an intensification of the hydrophobic characteristics of the surface. With loadings above the 75 mmol/kg, the adsorption of water vapor increased. Desorption of SDBAC from the organo-zeolite under environmentally relevant conditions: distilled water, pH 3 and 10 buffers, as well as aqueous NaCl and CaCl2 solutions, was investigated. OZs with loadings up to their external cation exchange capacity value (75 mmol/kg) were stable under all of the applied conditions.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Površinska modifikacija zeolita i uticaj pH i jonske jačine na desorpciju amina, Surface modification of a zeolite and the influence of pH and ionic strength on the desorption of an amine",
pages = "1172-1161",
number = "11",
volume = "71",
doi = "10.2298/JSC0611161L",
url = "conv_521"
}

Lemić, J., Milošević, S., Vukašinović, M., Radosavljević-Mihajlović, A.,& Kovačević, D.. (2006). Površinska modifikacija zeolita i uticaj pH i jonske jačine na desorpciju amina. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 71(11), 1161-1172.
https://doi.org/10.2298/JSC0611161L
conv_521

Lemić J, Milošević S, Vukašinović M, Radosavljević-Mihajlović A, Kovačević D. Površinska modifikacija zeolita i uticaj pH i jonske jačine na desorpciju amina. in Journal of the Serbian Chemical Society. 2006;71(11):1161-1172.
doi:10.2298/JSC0611161L
conv_521 .

Lemić, Jovan, Milošević, Siniša, Vukašinović, Marija, Radosavljević-Mihajlović, Ana, Kovačević, Dragana, "Površinska modifikacija zeolita i uticaj pH i jonske jačine na desorpciju amina" in Journal of the Serbian Chemical Society, 71, no. 11 (2006):1161-1172,
https://doi.org/10.2298/JSC0611161L .,
conv_521 .