TY  - CONF
AU  - Kaluđerović, Lazar
AU  - Tomić, Zorica
AU  - Bogosavljević, Jelena
AU  - Životić, Ljubomir
AU  - Milošević, Maja
PY  - 2022
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6494
AB  - Environmental problems related to the application of herbicides are causing a concern due to their increasing presence in soil, groundwater and surface water. Numerous methods have been developed in order to reduce herbicide mobility and protect natural water resources. The results presented in this paper show the interaction of herbicide S- metolachlor with inorganic and organically modified montmorillonite from Bogovina (Boljevac municipality, Serbia). Clay sample from Bogovina represents Ca-Na montmorillonite with a small amount of quartz, cristobalite and carbonate minerals. Organic montmorillonites were obtained after modification with different concentrations of organic complex (HDTMA and PTMA), whereas inorganic modification was performed with 1M NaCl solution. The interaction between minerals and herbicide was monitored using infrared spectroscopy. IR bands observed in the inorganic modified montmorillonite (Na-montmorillonite) are typical for smectites with a high Al content in the octahedron position.
The intercalation of HDTMA+ cations into the interlayer space produces redshift of the IR bands that originate from the vibrations of the adsorbed water, as a consequence of the hydrogen bond strength reduction in HDTMA-montmorillonite. Also, the intensity of these bands decreases significantly with the increasing concentration of HDTMA+ cation. All these changes are related to the decreasing of the water content in the interlayer space by increasing the content of HDTMA. The occurrence of the stretching CH2 vibrations is generally the main difference in the spectrum of HDTMA modified montmorillonite in comparison with the spectrum of inorganically modified montmorillonite. The wavenumber, intensity and width of these bands are sensitive to conformation in hydrocarbon chains. After the organic modification of the montmorillonite with the PTMA complex, stretching vibrations of the phenyl ring occurred.
Analysis of FTIR spectroscopy data showed that the hydrogen bond is one of the most important mechanisms that occur between Na-montmorillonite and S-metolachlor. Comparing the FTIR spectra of herbicides before and after the sorption, it can be concluded that the carbonyl group participate in the binding process. Sorption of S- metolachlor on HDTMA-montmorillonites causes the redshift of the C=O absorption band. Shifting to lower wavenumbers and joining with the deformation vibration band of water indicates that the C=O group participated in the formation of a bond with the montmorillonite. Sorption of S-metolachlor molecules on PTMA-montmorillonite takes place through the interaction between the aromatic benzene ring of S-metolachlor and the aromatic benzene ring of the organic complex (π-π bonds). Also, the formation of a hydrogen bond occurs between the molecules of S-metolachlor and the molecules of water that are in the interlayer space and/or oxygen on the surface of the tetrahedral sheet of the montmorillonite.
PB  - Serbian Society of Soil Science
C3  - 3rd International and 15th National Congress of Serbian Society of Soil Science: Soils for Future under Global Challenges, Sokobanja, Serbia, 21-24 September 2021
T1  - FTIR SPECTROSCOPIC STUDY OF S-METOLACHLOR SORPTION ON INORGANIC AND ORGANICALLY MODIFIED MONTMORILLONITE FROM BOGOVINA
EP  - 337
SP  - 329
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_6494
ER  - 

@conference{
author = "Kaluđerović, Lazar and Tomić, Zorica and Bogosavljević, Jelena and Životić, Ljubomir and Milošević, Maja",
year = "2022",
abstract = "Environmental problems related to the application of herbicides are causing a concern due to their increasing presence in soil, groundwater and surface water. Numerous methods have been developed in order to reduce herbicide mobility and protect natural water resources. The results presented in this paper show the interaction of herbicide S- metolachlor with inorganic and organically modified montmorillonite from Bogovina (Boljevac municipality, Serbia). Clay sample from Bogovina represents Ca-Na montmorillonite with a small amount of quartz, cristobalite and carbonate minerals. Organic montmorillonites were obtained after modification with different concentrations of organic complex (HDTMA and PTMA), whereas inorganic modification was performed with 1M NaCl solution. The interaction between minerals and herbicide was monitored using infrared spectroscopy. IR bands observed in the inorganic modified montmorillonite (Na-montmorillonite) are typical for smectites with a high Al content in the octahedron position.
The intercalation of HDTMA+ cations into the interlayer space produces redshift of the IR bands that originate from the vibrations of the adsorbed water, as a consequence of the hydrogen bond strength reduction in HDTMA-montmorillonite. Also, the intensity of these bands decreases significantly with the increasing concentration of HDTMA+ cation. All these changes are related to the decreasing of the water content in the interlayer space by increasing the content of HDTMA. The occurrence of the stretching CH2 vibrations is generally the main difference in the spectrum of HDTMA modified montmorillonite in comparison with the spectrum of inorganically modified montmorillonite. The wavenumber, intensity and width of these bands are sensitive to conformation in hydrocarbon chains. After the organic modification of the montmorillonite with the PTMA complex, stretching vibrations of the phenyl ring occurred.
Analysis of FTIR spectroscopy data showed that the hydrogen bond is one of the most important mechanisms that occur between Na-montmorillonite and S-metolachlor. Comparing the FTIR spectra of herbicides before and after the sorption, it can be concluded that the carbonyl group participate in the binding process. Sorption of S- metolachlor on HDTMA-montmorillonites causes the redshift of the C=O absorption band. Shifting to lower wavenumbers and joining with the deformation vibration band of water indicates that the C=O group participated in the formation of a bond with the montmorillonite. Sorption of S-metolachlor molecules on PTMA-montmorillonite takes place through the interaction between the aromatic benzene ring of S-metolachlor and the aromatic benzene ring of the organic complex (π-π bonds). Also, the formation of a hydrogen bond occurs between the molecules of S-metolachlor and the molecules of water that are in the interlayer space and/or oxygen on the surface of the tetrahedral sheet of the montmorillonite.",
publisher = "Serbian Society of Soil Science",
journal = "3rd International and 15th National Congress of Serbian Society of Soil Science: Soils for Future under Global Challenges, Sokobanja, Serbia, 21-24 September 2021",
title = "FTIR SPECTROSCOPIC STUDY OF S-METOLACHLOR SORPTION ON INORGANIC AND ORGANICALLY MODIFIED MONTMORILLONITE FROM BOGOVINA",
pages = "337-329",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_6494"
}

Kaluđerović, L., Tomić, Z., Bogosavljević, J., Životić, L.,& Milošević, M.. (2022). FTIR SPECTROSCOPIC STUDY OF S-METOLACHLOR SORPTION ON INORGANIC AND ORGANICALLY MODIFIED MONTMORILLONITE FROM BOGOVINA. in 3rd International and 15th National Congress of Serbian Society of Soil Science: Soils for Future under Global Challenges, Sokobanja, Serbia, 21-24 September 2021
Serbian Society of Soil Science., 329-337.
https://hdl.handle.net/21.15107/rcub_agrospace_6494

Kaluđerović L, Tomić Z, Bogosavljević J, Životić L, Milošević M. FTIR SPECTROSCOPIC STUDY OF S-METOLACHLOR SORPTION ON INORGANIC AND ORGANICALLY MODIFIED MONTMORILLONITE FROM BOGOVINA. in 3rd International and 15th National Congress of Serbian Society of Soil Science: Soils for Future under Global Challenges, Sokobanja, Serbia, 21-24 September 2021. 2022;:329-337.
https://hdl.handle.net/21.15107/rcub_agrospace_6494 .

Kaluđerović, Lazar, Tomić, Zorica, Bogosavljević, Jelena, Životić, Ljubomir, Milošević, Maja, "FTIR SPECTROSCOPIC STUDY OF S-METOLACHLOR SORPTION ON INORGANIC AND ORGANICALLY MODIFIED MONTMORILLONITE FROM BOGOVINA" in 3rd International and 15th National Congress of Serbian Society of Soil Science: Soils for Future under Global Challenges, Sokobanja, Serbia, 21-24 September 2021 (2022):329-337,
https://hdl.handle.net/21.15107/rcub_agrospace_6494 .

TY  - JOUR
AU  - Kaludjerović, Lazar
AU  - Isek, Josip
AU  - Vuković, Nikola
AU  - Milošević, Maja
PY  - 2019
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4949
AB  - In this study, the chemical and phase composition of two samples of phosphogypsum from the waste dumps of the Industry of Chemical Products "Elixir - Prahovo" (Serbia) were examined, as well as the possibility of recrystallization of gypsum from an aqueous suspension of phosphogypsum. 'the negative effect of higher temperatures on the solubility of calcium sulfate (13.08 mmol/dm(3) at 95 degrees C vs. 15.43 mmol/dm(3) at 40 degrees C) was utilized. In several repeated cycles, calcium sulfate component was progressively dissolved in water at room temperature and then precipitated at 100 degrees C, using the same liquid phase throughout the experiment. Therefore, phosphogypsum was separated into recrystallized (purified) gypsum, insoluble residue and supernatant, and the mass balance for the experiment was calculated. Elemental, XRD and SEM-EDS analyses were performed on raw phosphogypsum, purified gypsum and insoluble residue. The whiteness of raw phosphogypsum and purified gypsum were determined and compared. The main objective of the study was to investigate the nature of insoluble impurities, in order to define and optimize the methods for their removal during a potential industrial processing of phosphogypsum.
PB  - Polish Mineral Eng Soc, Krakow
T2  - Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society
T1  - Characterisation of Purified Gypsum and Insoluble Impurities Obtained from Phosphogypsum Waste
EP  - 78
IS  - 1
SP  - 73
DO  - 10.29227/IM-2019-01-13
ER  - 

@article{
author = "Kaludjerović, Lazar and Isek, Josip and Vuković, Nikola and Milošević, Maja",
year = "2019",
abstract = "In this study, the chemical and phase composition of two samples of phosphogypsum from the waste dumps of the Industry of Chemical Products "Elixir - Prahovo" (Serbia) were examined, as well as the possibility of recrystallization of gypsum from an aqueous suspension of phosphogypsum. 'the negative effect of higher temperatures on the solubility of calcium sulfate (13.08 mmol/dm(3) at 95 degrees C vs. 15.43 mmol/dm(3) at 40 degrees C) was utilized. In several repeated cycles, calcium sulfate component was progressively dissolved in water at room temperature and then precipitated at 100 degrees C, using the same liquid phase throughout the experiment. Therefore, phosphogypsum was separated into recrystallized (purified) gypsum, insoluble residue and supernatant, and the mass balance for the experiment was calculated. Elemental, XRD and SEM-EDS analyses were performed on raw phosphogypsum, purified gypsum and insoluble residue. The whiteness of raw phosphogypsum and purified gypsum were determined and compared. The main objective of the study was to investigate the nature of insoluble impurities, in order to define and optimize the methods for their removal during a potential industrial processing of phosphogypsum.",
publisher = "Polish Mineral Eng Soc, Krakow",
journal = "Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society",
title = "Characterisation of Purified Gypsum and Insoluble Impurities Obtained from Phosphogypsum Waste",
pages = "78-73",
number = "1",
doi = "10.29227/IM-2019-01-13"
}

Kaludjerović, L., Isek, J., Vuković, N.,& Milošević, M.. (2019). Characterisation of Purified Gypsum and Insoluble Impurities Obtained from Phosphogypsum Waste. in Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society
Polish Mineral Eng Soc, Krakow.(1), 73-78.
https://doi.org/10.29227/IM-2019-01-13

Kaludjerović L, Isek J, Vuković N, Milošević M. Characterisation of Purified Gypsum and Insoluble Impurities Obtained from Phosphogypsum Waste. in Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society. 2019;(1):73-78.
doi:10.29227/IM-2019-01-13 .

Kaludjerović, Lazar, Isek, Josip, Vuković, Nikola, Milošević, Maja, "Characterisation of Purified Gypsum and Insoluble Impurities Obtained from Phosphogypsum Waste" in Inzynieria Mineralna-Journal of the Polish Mineral Engineering Society, no. 1 (2019):73-78,
https://doi.org/10.29227/IM-2019-01-13 . .

TY  - CONF
AU  - Milošević, Maja
AU  - Logar, Mihovil
AU  - Kaludjerović, Lazar
AU  - Jelić, Ivana
PY  - 2017
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4435
AB  - This study focuses on the mineralogical and thermal properties of clay from "Slatina" deposit, Ub, Serbia. Sampled clays were analysed by XRD, IR spectroscopy, ICP-OES, DTA, specific surface area (SSA), cationic exchange capacity (CEC), gravimetric and grain size measurements. Results show that the studied samples have a medium content of smectite-illite minerals with smaller amount of kaolinite together with quartz, feldspars and goethite. They consist generally of fine particles with medium to high plasticity. Based on their mineral composition and physical properties (grain size, plasticity, CEC) the clays are suitable as raw material for the ceramics industry.
PB  - Elsevier Science Bv, Amsterdam
C3  - European Geosciences Union General Assembly 2017, Egu Division Energy, Resources & Environment (Ere)
T1  - Characterization of clays from Slatina (Ub, Serbia) for potential uses in the ceramic industry
EP  - 655
SP  - 650
VL  - 125
DO  - 10.1016/j.egypro.2017.08.270
ER  - 

@conference{
author = "Milošević, Maja and Logar, Mihovil and Kaludjerović, Lazar and Jelić, Ivana",
year = "2017",
abstract = "This study focuses on the mineralogical and thermal properties of clay from "Slatina" deposit, Ub, Serbia. Sampled clays were analysed by XRD, IR spectroscopy, ICP-OES, DTA, specific surface area (SSA), cationic exchange capacity (CEC), gravimetric and grain size measurements. Results show that the studied samples have a medium content of smectite-illite minerals with smaller amount of kaolinite together with quartz, feldspars and goethite. They consist generally of fine particles with medium to high plasticity. Based on their mineral composition and physical properties (grain size, plasticity, CEC) the clays are suitable as raw material for the ceramics industry.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "European Geosciences Union General Assembly 2017, Egu Division Energy, Resources & Environment (Ere)",
title = "Characterization of clays from Slatina (Ub, Serbia) for potential uses in the ceramic industry",
pages = "655-650",
volume = "125",
doi = "10.1016/j.egypro.2017.08.270"
}

Milošević, M., Logar, M., Kaludjerović, L.,& Jelić, I.. (2017). Characterization of clays from Slatina (Ub, Serbia) for potential uses in the ceramic industry. in European Geosciences Union General Assembly 2017, Egu Division Energy, Resources & Environment (Ere)
Elsevier Science Bv, Amsterdam., 125, 650-655.
https://doi.org/10.1016/j.egypro.2017.08.270

Milošević M, Logar M, Kaludjerović L, Jelić I. Characterization of clays from Slatina (Ub, Serbia) for potential uses in the ceramic industry. in European Geosciences Union General Assembly 2017, Egu Division Energy, Resources & Environment (Ere). 2017;125:650-655.
doi:10.1016/j.egypro.2017.08.270 .

Milošević, Maja, Logar, Mihovil, Kaludjerović, Lazar, Jelić, Ivana, "Characterization of clays from Slatina (Ub, Serbia) for potential uses in the ceramic industry" in European Geosciences Union General Assembly 2017, Egu Division Energy, Resources & Environment (Ere), 125 (2017):650-655,
https://doi.org/10.1016/j.egypro.2017.08.270 . .

TY  - CONF
AU  - Kaluđerović, Lazar
AU  - Tomić, Zorica
AU  - Đurović, Rada
AU  - Milošević, Maja
PY  - 2016
UR  - https://meetingorganizer.copernicus.org/EGU2016/EGU2016-3425.pdf
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6573
AB  - Pesticides are recognized as an important source of potential pollution to soil and water due to their mobility and degradation in soils. Results presented in this paper show impact of the organic complex concentration on the adsorption of herbicides (acetochlor) at the surface of the organic modified montmorillonite. In this work, natural montmorillonite from Bogovina, located near Boljevac municipality, was used for organic modification. Cationexchange capacity of this montmorillonite was determined by extraction with ammonium acetate (86 mmol/100g
of clay). Montmorillonite have been modified first with NaCl and than with two organic complexes, hexadecyltrimethylammonium bromide (HDTMA) and phenyltrimethylammonium chloride (PTMA). For both organic complexes, three saturation concentrations were selected for monitoring of the herbicide adsorption (43 mmol/100g of clay (0.5 CEC), 86 mmol/100g of clay (1 CEC) and 129 mmol/100g of clay (1.5 CEC)). Changes in the properties of the inorganic and organic bentonite have been examined using the X-ray powder diffraction (XRPD) andbatch equilibrium method. Increase in basal spacing (d) of montmorillonites saturated with 1.5 CEC of organic
cation indicate that sorption of PTMA and HDTMA can exceed the saturation of 1 CEC. Both organic montmorillonites have shown higher uptake of the herbicide, compared to the inorganic montmorillonite. Comparing the values Freundlich coefficients in batch equilibrium method, (presented in the form of log Kf and 1/n), it can be seen that the sorption decreases in the series: 0.5CEC> 1CEC> 1.5CEC> NaM, for both organic montmorillonites.
PB  - EGU General Assembly
C3  - Geophysical Research Abstracts Vol. 18, EGU2016-3425, 2016 EGU General Assembly 2016
T1  - Influence of the organic complex concentration on adsorption of herbicide in organic modified montmorillonite
EP  - 3425
SP  - 3425
VL  - 18
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_6573
ER  - 

@conference{
author = "Kaluđerović, Lazar and Tomić, Zorica and Đurović, Rada and Milošević, Maja",
year = "2016",
abstract = "Pesticides are recognized as an important source of potential pollution to soil and water due to their mobility and degradation in soils. Results presented in this paper show impact of the organic complex concentration on the adsorption of herbicides (acetochlor) at the surface of the organic modified montmorillonite. In this work, natural montmorillonite from Bogovina, located near Boljevac municipality, was used for organic modification. Cationexchange capacity of this montmorillonite was determined by extraction with ammonium acetate (86 mmol/100g
of clay). Montmorillonite have been modified first with NaCl and than with two organic complexes, hexadecyltrimethylammonium bromide (HDTMA) and phenyltrimethylammonium chloride (PTMA). For both organic complexes, three saturation concentrations were selected for monitoring of the herbicide adsorption (43 mmol/100g of clay (0.5 CEC), 86 mmol/100g of clay (1 CEC) and 129 mmol/100g of clay (1.5 CEC)). Changes in the properties of the inorganic and organic bentonite have been examined using the X-ray powder diffraction (XRPD) andbatch equilibrium method. Increase in basal spacing (d) of montmorillonites saturated with 1.5 CEC of organic
cation indicate that sorption of PTMA and HDTMA can exceed the saturation of 1 CEC. Both organic montmorillonites have shown higher uptake of the herbicide, compared to the inorganic montmorillonite. Comparing the values Freundlich coefficients in batch equilibrium method, (presented in the form of log Kf and 1/n), it can be seen that the sorption decreases in the series: 0.5CEC> 1CEC> 1.5CEC> NaM, for both organic montmorillonites.",
publisher = "EGU General Assembly",
journal = "Geophysical Research Abstracts Vol. 18, EGU2016-3425, 2016 EGU General Assembly 2016",
title = "Influence of the organic complex concentration on adsorption of herbicide in organic modified montmorillonite",
pages = "3425-3425",
volume = "18",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_6573"
}

Kaluđerović, L., Tomić, Z., Đurović, R.,& Milošević, M.. (2016). Influence of the organic complex concentration on adsorption of herbicide in organic modified montmorillonite. in Geophysical Research Abstracts Vol. 18, EGU2016-3425, 2016 EGU General Assembly 2016
EGU General Assembly., 18, 3425-3425.
https://hdl.handle.net/21.15107/rcub_agrospace_6573

Kaluđerović L, Tomić Z, Đurović R, Milošević M. Influence of the organic complex concentration on adsorption of herbicide in organic modified montmorillonite. in Geophysical Research Abstracts Vol. 18, EGU2016-3425, 2016 EGU General Assembly 2016. 2016;18:3425-3425.
https://hdl.handle.net/21.15107/rcub_agrospace_6573 .

Kaluđerović, Lazar, Tomić, Zorica, Đurović, Rada, Milošević, Maja, "Influence of the organic complex concentration on adsorption of herbicide in organic modified montmorillonite" in Geophysical Research Abstracts Vol. 18, EGU2016-3425, 2016 EGU General Assembly 2016, 18 (2016):3425-3425,
https://hdl.handle.net/21.15107/rcub_agrospace_6573 .