TY  - JOUR
AU  - Zunic, Marija J.
AU  - Milutinović-Nikolić, Aleksandra D.
AU  - Stanković, Dalibor
AU  - Manojlović, Dragan D.
AU  - Jović-Jovičić, Nataša
AU  - Banković, Predrag
AU  - Mojović, Zorica D.
AU  - Jovanović, Dušan M.
PY  - 2014
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1833
AB  - Bentonite clay rich in smectite clay mineral from seldom investigated locality Mecji Do (MD) in Serbia was modified. The organomodification was performed with different loadings of benzyltrimethylammonium (BTMA) cation. The characterization of clay-based samples was performed, including XRD, FTIR and chemical and textural analysis. Electrochemical investigation was performed on a glassy carbon electrode (GCE) support with thin film of homogenously deposited either Na-enriched or one of organomodified clays forming composite electrodes. The behavior of the composite electrodes in the electrooxidation of p-nitrophenol (p-NP) in acidic media was analyzed using multisweep cyclic voltammetry. Oxidation of p-NP occurred at 1.2 V vs. Ag/AgCl for all investigated electrodes. The results indicate that the incorporation of BTMA cations into smectite enhanced the electrode stability toward the electrooxidation of p-NP in comparison to bare GCE and composite electrode based on Na-enriched clay. The current density for the p-NP oxidation wave slightly decreased with the increase of BTMA loading. On the other hand the electrode stability was significantly improved with the increase of BTMA loading. (C) 2014 Elsevier B.V. All rights reserved.
PB  - Elsevier Science Bv, Amsterdam
T2  - Applied Surface Science
T1  - Electrooxidation of p-nitrophenol using a composite organo-smectite clay glassy carbon electrode
VL  - 313
SP  - 440
EP  - 448
DO  - 10.1016/j.apsusc.2014.05.228
ER  - 

@article{
author = "Zunic, Marija J. and Milutinović-Nikolić, Aleksandra D. and Stanković, Dalibor and Manojlović, Dragan D. and Jović-Jovičić, Nataša and Banković, Predrag and Mojović, Zorica D. and Jovanović, Dušan M.",
year = "2014",
abstract = "Bentonite clay rich in smectite clay mineral from seldom investigated locality Mecji Do (MD) in Serbia was modified. The organomodification was performed with different loadings of benzyltrimethylammonium (BTMA) cation. The characterization of clay-based samples was performed, including XRD, FTIR and chemical and textural analysis. Electrochemical investigation was performed on a glassy carbon electrode (GCE) support with thin film of homogenously deposited either Na-enriched or one of organomodified clays forming composite electrodes. The behavior of the composite electrodes in the electrooxidation of p-nitrophenol (p-NP) in acidic media was analyzed using multisweep cyclic voltammetry. Oxidation of p-NP occurred at 1.2 V vs. Ag/AgCl for all investigated electrodes. The results indicate that the incorporation of BTMA cations into smectite enhanced the electrode stability toward the electrooxidation of p-NP in comparison to bare GCE and composite electrode based on Na-enriched clay. The current density for the p-NP oxidation wave slightly decreased with the increase of BTMA loading. On the other hand the electrode stability was significantly improved with the increase of BTMA loading. (C) 2014 Elsevier B.V. All rights reserved.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Applied Surface Science",
title = "Electrooxidation of p-nitrophenol using a composite organo-smectite clay glassy carbon electrode",
volume = "313",
pages = "440-448",
doi = "10.1016/j.apsusc.2014.05.228"
}

Zunic, M. J., Milutinović-Nikolić, A. D., Stanković, D., Manojlović, D. D., Jović-Jovičić, N., Banković, P., Mojović, Z. D.,& Jovanović, D. M.. (2014). Electrooxidation of p-nitrophenol using a composite organo-smectite clay glassy carbon electrode. in Applied Surface Science
Elsevier Science Bv, Amsterdam., 313, 440-448.
https://doi.org/10.1016/j.apsusc.2014.05.228

Zunic MJ, Milutinović-Nikolić AD, Stanković D, Manojlović DD, Jović-Jovičić N, Banković P, Mojović ZD, Jovanović DM. Electrooxidation of p-nitrophenol using a composite organo-smectite clay glassy carbon electrode. in Applied Surface Science. 2014;313:440-448.
doi:10.1016/j.apsusc.2014.05.228 .

Zunic, Marija J., Milutinović-Nikolić, Aleksandra D., Stanković, Dalibor, Manojlović, Dragan D., Jović-Jovičić, Nataša, Banković, Predrag, Mojović, Zorica D., Jovanović, Dušan M., "Electrooxidation of p-nitrophenol using a composite organo-smectite clay glassy carbon electrode" in Applied Surface Science, 313 (2014):440-448,
https://doi.org/10.1016/j.apsusc.2014.05.228 . .

TY  - JOUR
AU  - Zunic, Marija J.
AU  - Milutinović-Nikolić, Aleksandra D.
AU  - Jović-Jovičić, Nataša
AU  - Banković, Predrag
AU  - Mojović, Zorica D.
AU  - Manojlović, Dragan D.
AU  - Jovanović, Dušan M.
PY  - 2010
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/1093
AB  - Modification and characterization of bentonite from location Bogovina, Serbia was performed in order to obtain material applicable in wastewater purification. The  lt 75 mu m bentonite fraction was used in organobentonite synthesis while the  lt 2 mu m bentonite fraction, obtained by hydroseparation was used in pillaring procedure. Organo-modification of bentonite was performed with (1-hexadecyl)trimethylammonium bromide (HDTMA-Br). Pillared bentonite was obtained using standard procedure. Al3+ and Fe3+ were incorporated in pillars in 4:1 ratio and applied as catalyst in catalytic wet peroxide oxidation. Differences in structure of starting and modified bentonites were established by XRD analysis and nitrogen physisorption on -196 degrees C. The (001) smectite peak around 2 theta = 6 degrees shifts during the modification process. The Na-exchange process lowered d(001) from 1.53 nm (2 theta = 5.78 degrees) for starting clay to 1.28 nm (2 theta = 6.92 degrees), but the clay retained its swelling properties. The pillaring process increased and fixed the basal spacing to 1.74 nm. Intercalation of HDTMA ions into smectite structure increased d(001) to 2.00 nm for organobentonite. Specific surface area, S-BET, was affected by particle size and type of modification. The samples with finer bentonite fraction had higher S-BET due to increased smectite content. Na-exchanged bentonite samples had higher S-BET value than starting clay samples of same granulation. Organomodification caused dramatic decrease in S-BET value, while the pillaring process lead to an increase of S-BET value. Adsorptive and catalytic purification of wastewaters containing dyes was tested using Acid Yellow 99 as a model dye. Na-exchanged bentonite had greater adsorption affinity for dye adsorption than raw bentonite owing to higher S-BET. By organomodification this affinity was enhanced more than 70 times due to transition of bentonite surface from hydrophilic to organophilic. Al,Fe pillared bentonite was proven to be efficient in catalytic wet peroxide oxidation of Acid Yellow 99 dye at room temperature.
AB  - Izvršena je modifikacija i karakterizacija bentonita radi dobijanja materijala za prečišćavanje otpadnih voda. Organo-modifikacija bentonita izvedena je pomoću heksadeciltrimetilamonijum-bromida. Pilareni bentonit dobijen je standardnim postupkom uz ugradnju Al3+ i Fe3+ jona u odnosu 4:1, i korišćen je kao katalizator za oksidativnu razgradnju u prisustvu vodonik-peroksida. Razlike u strukturi polaznog i modifikovanih bentonita utvrđene su rendgeno-strukturnom analizom i fizisorpcijom azota na -196°C. Ispitivano je adsorpciono i katalitičko prečišćavanje otpadnih voda koje sadrže boje, korišćenjem Acid Yellow 99 kao model boje. Izvršeno je poređenje katalitičkih i adsorpiconih svojstava modifikovanih bentonita.
PB  - Assoc Chemists & Chemical Engineers Of Serbia, Belgrade
T2  - Hemijska industrija
T1  - Modified Bentonite as Adsorbent and Catalyst for Purification of Wastewaters Containing Dyes
T1  - Modifikovani bentonit kao adsorbent i katalizator za prečišćavanje otpadnih voda koje sadrže boje
VL  - 64
IS  - 3
SP  - 193
EP  - 199
DO  - 10.2298/HEMIND091221023Z
ER  - 

@article{
author = "Zunic, Marija J. and Milutinović-Nikolić, Aleksandra D. and Jović-Jovičić, Nataša and Banković, Predrag and Mojović, Zorica D. and Manojlović, Dragan D. and Jovanović, Dušan M.",
year = "2010",
abstract = "Modification and characterization of bentonite from location Bogovina, Serbia was performed in order to obtain material applicable in wastewater purification. The  lt 75 mu m bentonite fraction was used in organobentonite synthesis while the  lt 2 mu m bentonite fraction, obtained by hydroseparation was used in pillaring procedure. Organo-modification of bentonite was performed with (1-hexadecyl)trimethylammonium bromide (HDTMA-Br). Pillared bentonite was obtained using standard procedure. Al3+ and Fe3+ were incorporated in pillars in 4:1 ratio and applied as catalyst in catalytic wet peroxide oxidation. Differences in structure of starting and modified bentonites were established by XRD analysis and nitrogen physisorption on -196 degrees C. The (001) smectite peak around 2 theta = 6 degrees shifts during the modification process. The Na-exchange process lowered d(001) from 1.53 nm (2 theta = 5.78 degrees) for starting clay to 1.28 nm (2 theta = 6.92 degrees), but the clay retained its swelling properties. The pillaring process increased and fixed the basal spacing to 1.74 nm. Intercalation of HDTMA ions into smectite structure increased d(001) to 2.00 nm for organobentonite. Specific surface area, S-BET, was affected by particle size and type of modification. The samples with finer bentonite fraction had higher S-BET due to increased smectite content. Na-exchanged bentonite samples had higher S-BET value than starting clay samples of same granulation. Organomodification caused dramatic decrease in S-BET value, while the pillaring process lead to an increase of S-BET value. Adsorptive and catalytic purification of wastewaters containing dyes was tested using Acid Yellow 99 as a model dye. Na-exchanged bentonite had greater adsorption affinity for dye adsorption than raw bentonite owing to higher S-BET. By organomodification this affinity was enhanced more than 70 times due to transition of bentonite surface from hydrophilic to organophilic. Al,Fe pillared bentonite was proven to be efficient in catalytic wet peroxide oxidation of Acid Yellow 99 dye at room temperature., Izvršena je modifikacija i karakterizacija bentonita radi dobijanja materijala za prečišćavanje otpadnih voda. Organo-modifikacija bentonita izvedena je pomoću heksadeciltrimetilamonijum-bromida. Pilareni bentonit dobijen je standardnim postupkom uz ugradnju Al3+ i Fe3+ jona u odnosu 4:1, i korišćen je kao katalizator za oksidativnu razgradnju u prisustvu vodonik-peroksida. Razlike u strukturi polaznog i modifikovanih bentonita utvrđene su rendgeno-strukturnom analizom i fizisorpcijom azota na -196°C. Ispitivano je adsorpciono i katalitičko prečišćavanje otpadnih voda koje sadrže boje, korišćenjem Acid Yellow 99 kao model boje. Izvršeno je poređenje katalitičkih i adsorpiconih svojstava modifikovanih bentonita.",
publisher = "Assoc Chemists & Chemical Engineers Of Serbia, Belgrade",
journal = "Hemijska industrija",
title = "Modified Bentonite as Adsorbent and Catalyst for Purification of Wastewaters Containing Dyes, Modifikovani bentonit kao adsorbent i katalizator za prečišćavanje otpadnih voda koje sadrže boje",
volume = "64",
number = "3",
pages = "193-199",
doi = "10.2298/HEMIND091221023Z"
}

Zunic, M. J., Milutinović-Nikolić, A. D., Jović-Jovičić, N., Banković, P., Mojović, Z. D., Manojlović, D. D.,& Jovanović, D. M.. (2010). Modified Bentonite as Adsorbent and Catalyst for Purification of Wastewaters Containing Dyes. in Hemijska industrija
Assoc Chemists & Chemical Engineers Of Serbia, Belgrade., 64(3), 193-199.
https://doi.org/10.2298/HEMIND091221023Z

Zunic MJ, Milutinović-Nikolić AD, Jović-Jovičić N, Banković P, Mojović ZD, Manojlović DD, Jovanović DM. Modified Bentonite as Adsorbent and Catalyst for Purification of Wastewaters Containing Dyes. in Hemijska industrija. 2010;64(3):193-199.
doi:10.2298/HEMIND091221023Z .

Zunic, Marija J., Milutinović-Nikolić, Aleksandra D., Jović-Jovičić, Nataša, Banković, Predrag, Mojović, Zorica D., Manojlović, Dragan D., Jovanović, Dušan M., "Modified Bentonite as Adsorbent and Catalyst for Purification of Wastewaters Containing Dyes" in Hemijska industrija, 64, no. 3 (2010):193-199,
https://doi.org/10.2298/HEMIND091221023Z . .

TY  - JOUR
AU  - Jović-Jovičić, Nataša
AU  - Milutinović-Nikolić, Aleksandra D.
AU  - Gržetić, Ivan
AU  - Banković, Predrag
AU  - Marković, Branislav Z.
AU  - Jovanović, Dušan M.
PY  - 2008
UR  - https://cherry.chem.bg.ac.rs/handle/123456789/954
AB  - Natural bentonite clay from the Bogovina locality in Serbia was Na-exchanged and modified using hexadecyll-trimethylammonium bromide as surfactant and organobentonite was obtained. The influence of modifications on the structural, textural and sorption properties of bentonite was investigated. It was estimated that modifications solely replace exchangeable cations in smectite layers, whereas other admixture minerals (quartz, calcite, feldspar) in bentonite remain unaffected. According to X-ray results the modification lead to changes in the smectite structure by either decreasing, for Na-bentonite, or increasing, for organobentonite, the interplanar spacing, d(001). The appearance of three new bands in IR spectra of HDTMA-bentonite comparing to those of raw and Na-bentonite assigned to the methylene vibrations confirmed the embedding of aliphatic cations into smectite structure. In organobentonite a significant change in textural properties was observed. In particular, specific surface area dramatically decreased while originally meso and microporous material became almost completely non-porous. Despite almost insignificant specific surface area the synthesized organobentonite due to gained organophyllity of its surface exhibits exquisite adsorption properties toward investigated textile dyes having adsorption capacity approx. 2 times higher than activated carbon.
AB  - Prirodna bentonitna glina sa lokaliteta Bogovina u Srbiji je natrijumski izmenjena i modifikovana heksadeciltrimetil amonijum-bromidom kao surfaktantom, pri čemu je dobijen organobentonit. Ispitivan je uticaj modifikacije na strukturu, teksturalna i adsorpciona svojstva bentonita. Utvrđeno je da primenjeni postupci modifikacije dovode isključivo do izmene katjona u medulamelamom sloju smektita, dok modifikacija ne deluje na druge prateće minerale u bentonitu (kvare, kalcit, feldspat). Uprkos neznatnoj specifičnoj površini sintetizovani organobentonit zahvaljujući novodobijenoj organofilnosti površine pokazuje izuzetna adsorpciona svojstva prema tekstilnim bojama, imajući adsorpcioni kapacitet oko 2 puta veći od aktivnog uglja.
PB  - Assoc Chemical Engineers Serbia, Belgrade
T2  - Hemijska industrija
T1  - The influence of modification on structural, textural and adsorption properties of bentonite
T1  - Uticaj modifikacije na strukturna, teksturalna i adsorpciona svojstva bentonita
VL  - 62
IS  - 3
SP  - 131
EP  - 137
DO  - 10.2298/HEMIND0803131J
ER  - 

@article{
author = "Jović-Jovičić, Nataša and Milutinović-Nikolić, Aleksandra D. and Gržetić, Ivan and Banković, Predrag and Marković, Branislav Z. and Jovanović, Dušan M.",
year = "2008",
abstract = "Natural bentonite clay from the Bogovina locality in Serbia was Na-exchanged and modified using hexadecyll-trimethylammonium bromide as surfactant and organobentonite was obtained. The influence of modifications on the structural, textural and sorption properties of bentonite was investigated. It was estimated that modifications solely replace exchangeable cations in smectite layers, whereas other admixture minerals (quartz, calcite, feldspar) in bentonite remain unaffected. According to X-ray results the modification lead to changes in the smectite structure by either decreasing, for Na-bentonite, or increasing, for organobentonite, the interplanar spacing, d(001). The appearance of three new bands in IR spectra of HDTMA-bentonite comparing to those of raw and Na-bentonite assigned to the methylene vibrations confirmed the embedding of aliphatic cations into smectite structure. In organobentonite a significant change in textural properties was observed. In particular, specific surface area dramatically decreased while originally meso and microporous material became almost completely non-porous. Despite almost insignificant specific surface area the synthesized organobentonite due to gained organophyllity of its surface exhibits exquisite adsorption properties toward investigated textile dyes having adsorption capacity approx. 2 times higher than activated carbon., Prirodna bentonitna glina sa lokaliteta Bogovina u Srbiji je natrijumski izmenjena i modifikovana heksadeciltrimetil amonijum-bromidom kao surfaktantom, pri čemu je dobijen organobentonit. Ispitivan je uticaj modifikacije na strukturu, teksturalna i adsorpciona svojstva bentonita. Utvrđeno je da primenjeni postupci modifikacije dovode isključivo do izmene katjona u medulamelamom sloju smektita, dok modifikacija ne deluje na druge prateće minerale u bentonitu (kvare, kalcit, feldspat). Uprkos neznatnoj specifičnoj površini sintetizovani organobentonit zahvaljujući novodobijenoj organofilnosti površine pokazuje izuzetna adsorpciona svojstva prema tekstilnim bojama, imajući adsorpcioni kapacitet oko 2 puta veći od aktivnog uglja.",
publisher = "Assoc Chemical Engineers Serbia, Belgrade",
journal = "Hemijska industrija",
title = "The influence of modification on structural, textural and adsorption properties of bentonite, Uticaj modifikacije na strukturna, teksturalna i adsorpciona svojstva bentonita",
volume = "62",
number = "3",
pages = "131-137",
doi = "10.2298/HEMIND0803131J"
}

Jović-Jovičić, N., Milutinović-Nikolić, A. D., Gržetić, I., Banković, P., Marković, B. Z.,& Jovanović, D. M.. (2008). The influence of modification on structural, textural and adsorption properties of bentonite. in Hemijska industrija
Assoc Chemical Engineers Serbia, Belgrade., 62(3), 131-137.
https://doi.org/10.2298/HEMIND0803131J

Jović-Jovičić N, Milutinović-Nikolić AD, Gržetić I, Banković P, Marković BZ, Jovanović DM. The influence of modification on structural, textural and adsorption properties of bentonite. in Hemijska industrija. 2008;62(3):131-137.
doi:10.2298/HEMIND0803131J .

Jović-Jovičić, Nataša, Milutinović-Nikolić, Aleksandra D., Gržetić, Ivan, Banković, Predrag, Marković, Branislav Z., Jovanović, Dušan M., "The influence of modification on structural, textural and adsorption properties of bentonite" in Hemijska industrija, 62, no. 3 (2008):131-137,
https://doi.org/10.2298/HEMIND0803131J . .