TY  - JOUR
AU  - Ristić, Mirjana
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Tijana
AU  - Jovanović, Vojislav
AU  - Kostić, Marija
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2024
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12482
AB  - In this research, a composite based on montmorillonite (K10) modified with HDTMABr was used. The characterization of the pure K10, NaMMT and OMMT was performed using XRD, FTIR-ATR, SEM, TG, DTG, and DTA. Ion exchange capacity (CEC) and specific surface area (SSA) were also determined. The sulfite method was used to determine free and liberated formaldehyde (FA) from synthesized urea-formaldehyde/montmorillonite (UF/ MMT) composites. This research aims to demonstrate the bifunctionality of OMMT and that it can be used both for the capture of FA from the synthesized cross-linked UF resin and for the adsorption of the anionic dye Acid Red 183 (AR183) from aquatic medium. SEM analysis showed that there are changes in the morphology of the OMMT and the formation of a hollow network, which affects the absorption capacity of the clay. The calculated values of free and liberated FA in the UF/OMMT composites are drastically reduced and amount to 0.12% and 0.96%, respectively, compared to the composites with K10 (0.6% and 2.04%, respectively). Also, very promising results were obtained of the adsorption of AR183 dyes from the aquatic medium using OMMT. The results show that OMMT (0.5 g OMMT/50 cm3 aqueous dye solution, c=20 mgdm− 3 ) managed to remove 85.95% of AR183 dye (pH dye=7). The adsorption mechanism of AR183 on OMMT follows the Freundlich isotherm and proceeds according to the pseudo-first-order kinetic model. Overall, the findings of this work indicate that the use of the obtained OMMT has great potential in removing pollutants from two totally different systems.
T2  - Journal of Environmental Chemical Engineering
T1  - Organically modified montmorillonite as an environmental adsorbent of pollutants: Formaldehyde from urea-formaldehyde resin and Acid Red 183 dye from the aqueous solution
VL  - 12
IS  - 1
SP  - 111828
DO  - 10.1016/j.jece.2023.111828
ER  - 

@article{
author = "Ristić, Mirjana and Samaržija-Jovanović, Suzana and Jovanović, Tijana and Jovanović, Vojislav and Kostić, Marija and Marković, Gordana and Marinović-Cincović, Milena",
year = "2024",
abstract = "In this research, a composite based on montmorillonite (K10) modified with HDTMABr was used. The characterization of the pure K10, NaMMT and OMMT was performed using XRD, FTIR-ATR, SEM, TG, DTG, and DTA. Ion exchange capacity (CEC) and specific surface area (SSA) were also determined. The sulfite method was used to determine free and liberated formaldehyde (FA) from synthesized urea-formaldehyde/montmorillonite (UF/ MMT) composites. This research aims to demonstrate the bifunctionality of OMMT and that it can be used both for the capture of FA from the synthesized cross-linked UF resin and for the adsorption of the anionic dye Acid Red 183 (AR183) from aquatic medium. SEM analysis showed that there are changes in the morphology of the OMMT and the formation of a hollow network, which affects the absorption capacity of the clay. The calculated values of free and liberated FA in the UF/OMMT composites are drastically reduced and amount to 0.12% and 0.96%, respectively, compared to the composites with K10 (0.6% and 2.04%, respectively). Also, very promising results were obtained of the adsorption of AR183 dyes from the aquatic medium using OMMT. The results show that OMMT (0.5 g OMMT/50 cm3 aqueous dye solution, c=20 mgdm− 3 ) managed to remove 85.95% of AR183 dye (pH dye=7). The adsorption mechanism of AR183 on OMMT follows the Freundlich isotherm and proceeds according to the pseudo-first-order kinetic model. Overall, the findings of this work indicate that the use of the obtained OMMT has great potential in removing pollutants from two totally different systems.",
journal = "Journal of Environmental Chemical Engineering",
title = "Organically modified montmorillonite as an environmental adsorbent of pollutants: Formaldehyde from urea-formaldehyde resin and Acid Red 183 dye from the aqueous solution",
volume = "12",
number = "1",
pages = "111828",
doi = "10.1016/j.jece.2023.111828"
}

Ristić, M., Samaržija-Jovanović, S., Jovanović, T., Jovanović, V., Kostić, M., Marković, G.,& Marinović-Cincović, M.. (2024). Organically modified montmorillonite as an environmental adsorbent of pollutants: Formaldehyde from urea-formaldehyde resin and Acid Red 183 dye from the aqueous solution. in Journal of Environmental Chemical Engineering, 12(1), 111828.
https://doi.org/10.1016/j.jece.2023.111828

Ristić M, Samaržija-Jovanović S, Jovanović T, Jovanović V, Kostić M, Marković G, Marinović-Cincović M. Organically modified montmorillonite as an environmental adsorbent of pollutants: Formaldehyde from urea-formaldehyde resin and Acid Red 183 dye from the aqueous solution. in Journal of Environmental Chemical Engineering. 2024;12(1):111828.
doi:10.1016/j.jece.2023.111828 .

Ristić, Mirjana, Samaržija-Jovanović, Suzana, Jovanović, Tijana, Jovanović, Vojislav, Kostić, Marija, Marković, Gordana, Marinović-Cincović, Milena, "Organically modified montmorillonite as an environmental adsorbent of pollutants: Formaldehyde from urea-formaldehyde resin and Acid Red 183 dye from the aqueous solution" in Journal of Environmental Chemical Engineering, 12, no. 1 (2024):111828,
https://doi.org/10.1016/j.jece.2023.111828 . .

TY  - CONF
AU  - Ristić, Mirjana
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Kostić, Marija
AU  - Jovanović, Tijana
AU  - Marković, Gordana
AU  - Kojić, Marija
AU  - Marinović-Cincović, Milena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12225
PB  - Niš : RAD Centre
C3  - RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts
T1  - Functional materials based on renewable raw materials: hydrochar and chitosan as formaldehyde scavengers in urea-formaldehide composites
SP  - 80
EP  - 80
DO  - 10.21175/rad.abstr.book.2023.19.1
ER  - 

@conference{
author = "Ristić, Mirjana and Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Kostić, Marija and Jovanović, Tijana and Marković, Gordana and Kojić, Marija and Marinović-Cincović, Milena",
year = "2023",
publisher = "Niš : RAD Centre",
journal = "RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts",
title = "Functional materials based on renewable raw materials: hydrochar and chitosan as formaldehyde scavengers in urea-formaldehide composites",
pages = "80-80",
doi = "10.21175/rad.abstr.book.2023.19.1"
}

Ristić, M., Samaržija-Jovanović, S., Jovanović, V., Kostić, M., Jovanović, T., Marković, G., Kojić, M.,& Marinović-Cincović, M.. (2023). Functional materials based on renewable raw materials: hydrochar and chitosan as formaldehyde scavengers in urea-formaldehide composites. in RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts
Niš : RAD Centre., 80-80.
https://doi.org/10.21175/rad.abstr.book.2023.19.1

Ristić M, Samaržija-Jovanović S, Jovanović V, Kostić M, Jovanović T, Marković G, Kojić M, Marinović-Cincović M. Functional materials based on renewable raw materials: hydrochar and chitosan as formaldehyde scavengers in urea-formaldehide composites. in RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts. 2023;:80-80.
doi:10.21175/rad.abstr.book.2023.19.1 .

Ristić, Mirjana, Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Kostić, Marija, Jovanović, Tijana, Marković, Gordana, Kojić, Marija, Marinović-Cincović, Milena, "Functional materials based on renewable raw materials: hydrochar and chitosan as formaldehyde scavengers in urea-formaldehide composites" in RAD 2023 : 11th International Conference on Radiation Natural Sciences, Medicine, Engineering, Technology and Ecology : Book of Abstracts (2023):80-80,
https://doi.org/10.21175/rad.abstr.book.2023.19.1 . .

TY  - JOUR
AU  - Ristić, Mirjana
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Kostić, Marija
AU  - Erceg, Tamara
AU  - Jovanović, Tijana
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11101
AB  - In this work, betaine (trimethyl glycine) and tannin (complex biomolecules of polyphenolic nature) were used as bio-fillers. Urea-formaldehyde (UF) resin with a molar ratio of formaldehyde versus urea (FA/U) of 0.8 was synthesized in situ with tannin and betaine as bio-fillers, to obtain UF resin with reduced free FA content and increased hydrolytic and thermal stability by the principles of sustainability. The samples TUF (with tannin) and BUF (with betaine) were characterized by using X-ray diffraction analysis (XRD), non-isothermal thermogravimetric analysis (TGA), and differential thermal analysis (DTA), supported by data from Fourier Transform Infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM). The percentage of free FA in modified BUF resin is 0.1%, while the percentage of free FA in tannin-modified resin is 0.8%. The hydrolytic stability of the modified UF resins was determined by measuring the concentration of liberated FA in the modified UF resins, after acid hydrolysis. The modified BUF resin is hydrolytically more stable because the content of released FA is 3.6% compared to the modified TUF resin, where it was 7.4%. Based on the value for T5%, the more thermally stable resin is the modified TUF resin (T5% = 123.1°C), while the value of the T5% for the BUF resin is 83.1°C. This work showed how UF bio-composite with reduced free FA content and increased hydrolytic and thermal stability can be obtained using tannin and betaine as bio-fillers.
T2  - Journal of Vinyl and Additive Technology
T1  - Hydrolytic and thermal stability of urea-formaldehyde resins based on tannin and betaine bio-fillers
VL  - 29
IS  - 6
SP  - 1082
EP  - 1092
DO  - 10.1002/vnl.22024
ER  - 

@article{
author = "Ristić, Mirjana and Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Kostić, Marija and Erceg, Tamara and Jovanović, Tijana and Marković, Gordana and Marinović-Cincović, Milena",
year = "2023",
abstract = "In this work, betaine (trimethyl glycine) and tannin (complex biomolecules of polyphenolic nature) were used as bio-fillers. Urea-formaldehyde (UF) resin with a molar ratio of formaldehyde versus urea (FA/U) of 0.8 was synthesized in situ with tannin and betaine as bio-fillers, to obtain UF resin with reduced free FA content and increased hydrolytic and thermal stability by the principles of sustainability. The samples TUF (with tannin) and BUF (with betaine) were characterized by using X-ray diffraction analysis (XRD), non-isothermal thermogravimetric analysis (TGA), and differential thermal analysis (DTA), supported by data from Fourier Transform Infrared spectroscopy (FTIR) and Scanning electron microscopy (SEM). The percentage of free FA in modified BUF resin is 0.1%, while the percentage of free FA in tannin-modified resin is 0.8%. The hydrolytic stability of the modified UF resins was determined by measuring the concentration of liberated FA in the modified UF resins, after acid hydrolysis. The modified BUF resin is hydrolytically more stable because the content of released FA is 3.6% compared to the modified TUF resin, where it was 7.4%. Based on the value for T5%, the more thermally stable resin is the modified TUF resin (T5% = 123.1°C), while the value of the T5% for the BUF resin is 83.1°C. This work showed how UF bio-composite with reduced free FA content and increased hydrolytic and thermal stability can be obtained using tannin and betaine as bio-fillers.",
journal = "Journal of Vinyl and Additive Technology",
title = "Hydrolytic and thermal stability of urea-formaldehyde resins based on tannin and betaine bio-fillers",
volume = "29",
number = "6",
pages = "1082-1092",
doi = "10.1002/vnl.22024"
}

Ristić, M., Samaržija-Jovanović, S., Jovanović, V., Kostić, M., Erceg, T., Jovanović, T., Marković, G.,& Marinović-Cincović, M.. (2023). Hydrolytic and thermal stability of urea-formaldehyde resins based on tannin and betaine bio-fillers. in Journal of Vinyl and Additive Technology, 29(6), 1082-1092.
https://doi.org/10.1002/vnl.22024

Ristić M, Samaržija-Jovanović S, Jovanović V, Kostić M, Erceg T, Jovanović T, Marković G, Marinović-Cincović M. Hydrolytic and thermal stability of urea-formaldehyde resins based on tannin and betaine bio-fillers. in Journal of Vinyl and Additive Technology. 2023;29(6):1082-1092.
doi:10.1002/vnl.22024 .

Ristić, Mirjana, Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Kostić, Marija, Erceg, Tamara, Jovanović, Tijana, Marković, Gordana, Marinović-Cincović, Milena, "Hydrolytic and thermal stability of urea-formaldehyde resins based on tannin and betaine bio-fillers" in Journal of Vinyl and Additive Technology, 29, no. 6 (2023):1082-1092,
https://doi.org/10.1002/vnl.22024 . .

TY  - JOUR
AU  - Kostić, Marija
AU  - Samaržija-Jovanović, Suzana
AU  - Ristić, Mirjana
AU  - Jovanović, Tijana
AU  - Jovanović, Vojislav
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10923
AB  - In this paper, the synthesis of modified urea-formaldehyde (UF) composites with differently activated montmorillonite KSF (UF/KSF) was performed. Two types of montmorillonite (MMT) KSF were used: sample activated with sulfuric acid-KSF(H2SO4) and sample activated with acid and stirring-KSF(H2SO4+stirrer). In order to examine the effect of KSF activation mode on the thermal and hydrolytic stability of UF resins, thermogravimetric analysis (TGA) was performed, as well as A determination of the amount of liberated formaldehyde (FA) after acid hydrolysis. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis were used to characterize the samples of modified UF/KSF composites and differently activated KSF. Activation of KSF led to a decrease in its specific surface area (SSA) and to an increase in cation exchange capacity (CEC). SEM analysis showed that in the KSF(H2SO4+stirrer) sample, the layered microstructure was disrupted. Free formaldehyde was not detected in the sample of UF resin with KSF(H2SO4), and in the sample with KSF(H2SO4+stirrer) it was 0.06%. The UF/KSF(H2SO4) composite showed higher hydrolytic stability (3.9%) compared to UF/KSF(H2SO4+stirrer) (4.62%), but lower compared to the UF/KSF(inactive) (1.23%). TG analysis showed that the KSF(H2SO4) sample had better thermal stability than the KSF(H2SO4+stirrer) sample, but this did not contribute to the better thermal stability of UF/KSF(H2SO4) compared to UF/KSF(H2SO4+stirrer), both samples had a T5% value of 112 °C.
T2  - International Journal of Adhesion and Adhesives
T1  - Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites
VL  - 124
SP  - 103390
DO  - 10.1016/j.ijadhadh.2023.103390
ER  - 

@article{
author = "Kostić, Marija and Samaržija-Jovanović, Suzana and Ristić, Mirjana and Jovanović, Tijana and Jovanović, Vojislav and Marković, Gordana and Marinović-Cincović, Milena",
year = "2023",
abstract = "In this paper, the synthesis of modified urea-formaldehyde (UF) composites with differently activated montmorillonite KSF (UF/KSF) was performed. Two types of montmorillonite (MMT) KSF were used: sample activated with sulfuric acid-KSF(H2SO4) and sample activated with acid and stirring-KSF(H2SO4+stirrer). In order to examine the effect of KSF activation mode on the thermal and hydrolytic stability of UF resins, thermogravimetric analysis (TGA) was performed, as well as A determination of the amount of liberated formaldehyde (FA) after acid hydrolysis. Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD) analysis were used to characterize the samples of modified UF/KSF composites and differently activated KSF. Activation of KSF led to a decrease in its specific surface area (SSA) and to an increase in cation exchange capacity (CEC). SEM analysis showed that in the KSF(H2SO4+stirrer) sample, the layered microstructure was disrupted. Free formaldehyde was not detected in the sample of UF resin with KSF(H2SO4), and in the sample with KSF(H2SO4+stirrer) it was 0.06%. The UF/KSF(H2SO4) composite showed higher hydrolytic stability (3.9%) compared to UF/KSF(H2SO4+stirrer) (4.62%), but lower compared to the UF/KSF(inactive) (1.23%). TG analysis showed that the KSF(H2SO4) sample had better thermal stability than the KSF(H2SO4+stirrer) sample, but this did not contribute to the better thermal stability of UF/KSF(H2SO4) compared to UF/KSF(H2SO4+stirrer), both samples had a T5% value of 112 °C.",
journal = "International Journal of Adhesion and Adhesives",
title = "Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites",
volume = "124",
pages = "103390",
doi = "10.1016/j.ijadhadh.2023.103390"
}

Kostić, M., Samaržija-Jovanović, S., Ristić, M., Jovanović, T., Jovanović, V., Marković, G.,& Marinović-Cincović, M.. (2023). Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites. in International Journal of Adhesion and Adhesives, 124, 103390.
https://doi.org/10.1016/j.ijadhadh.2023.103390

Kostić M, Samaržija-Jovanović S, Ristić M, Jovanović T, Jovanović V, Marković G, Marinović-Cincović M. Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites. in International Journal of Adhesion and Adhesives. 2023;124:103390.
doi:10.1016/j.ijadhadh.2023.103390 .

Kostić, Marija, Samaržija-Jovanović, Suzana, Ristić, Mirjana, Jovanović, Tijana, Jovanović, Vojislav, Marković, Gordana, Marinović-Cincović, Milena, "Effect of montmorillonite activation method on formaldehyde content in urea-formaldehyde composites" in International Journal of Adhesion and Adhesives, 124 (2023):103390,
https://doi.org/10.1016/j.ijadhadh.2023.103390 . .

TY  - CONF
AU  - Ristić, Mirjana
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Kostić, Marija
AU  - Jovanović, Tijana
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12252
AB  - Urea-formaldehyde (UF) resins are the leading adhesive in the wood industry. Their disadvantages are low water resistance and formaldehyde (FA) emissions from wood panels due to the low stability of the amino-methylene bond. Since FA has a detrimental effect on the environment and human health, the main goal of the modern adhesives industry is to produce efficient UF adhesives with low amounts of emitted, if not without, FA. One way to achieve this is to add a formaldehyde scavenger. In this work, UF resins modified with zeolite type ZSM-5 and bentonite as free FA scavengers are analyzed and compared. A total of three UF resins were synthesized: pure UF resin (UF), UF composite containing zeolite (ZUF), and bentonite (BUF) under the same conditions. Specific surface area (SSA) and cation exchange capacity (CEC) for bentonite and zeolite were determined. SSA (Sears' method) for bentonite is 19.9 m2/g and for zeolite 39.1 m2/g. The CEC of bentonite is 0.68 mol/kg, and that of zeolite is 0.1 mol/kg. The disulfide method was used to determine free FA in modified UF resins. The amount of free FA in the ZUF composite is 0.06%, while in the BUF composite is 0.18%. The hydrolytic stability of modified UF resins was determined by measuring the amount of liberated FA in the modified UF resins after acid hydrolysis. The results show that the amount of released FA in the ZUF composite is 4.08%, while in the BUF resin, it is 4.8%. Based on the obtained results, it can be concluded that zeolite is a better scavenger of free FA than bentonite and that its ZUF composite is hydrolytically more stable than the BUF composite.
PB  - Leskovac : Faculty of Technology, University of Niš
C3  - 15th International symposium „Novel technologies and sustainable development" : Book of Abstracts
T1  - Zeolite and Bentonite as Formaldehyde Scavengers in Urea-Formaldehyde Resins
SP  - 111
EP  - 111
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12252
ER  - 

@conference{
author = "Ristić, Mirjana and Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Kostić, Marija and Jovanović, Tijana and Marković, Gordana and Marinović-Cincović, Milena",
year = "2023",
abstract = "Urea-formaldehyde (UF) resins are the leading adhesive in the wood industry. Their disadvantages are low water resistance and formaldehyde (FA) emissions from wood panels due to the low stability of the amino-methylene bond. Since FA has a detrimental effect on the environment and human health, the main goal of the modern adhesives industry is to produce efficient UF adhesives with low amounts of emitted, if not without, FA. One way to achieve this is to add a formaldehyde scavenger. In this work, UF resins modified with zeolite type ZSM-5 and bentonite as free FA scavengers are analyzed and compared. A total of three UF resins were synthesized: pure UF resin (UF), UF composite containing zeolite (ZUF), and bentonite (BUF) under the same conditions. Specific surface area (SSA) and cation exchange capacity (CEC) for bentonite and zeolite were determined. SSA (Sears' method) for bentonite is 19.9 m2/g and for zeolite 39.1 m2/g. The CEC of bentonite is 0.68 mol/kg, and that of zeolite is 0.1 mol/kg. The disulfide method was used to determine free FA in modified UF resins. The amount of free FA in the ZUF composite is 0.06%, while in the BUF composite is 0.18%. The hydrolytic stability of modified UF resins was determined by measuring the amount of liberated FA in the modified UF resins after acid hydrolysis. The results show that the amount of released FA in the ZUF composite is 4.08%, while in the BUF resin, it is 4.8%. Based on the obtained results, it can be concluded that zeolite is a better scavenger of free FA than bentonite and that its ZUF composite is hydrolytically more stable than the BUF composite.",
publisher = "Leskovac : Faculty of Technology, University of Niš",
journal = "15th International symposium „Novel technologies and sustainable development" : Book of Abstracts",
title = "Zeolite and Bentonite as Formaldehyde Scavengers in Urea-Formaldehyde Resins",
pages = "111-111",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12252"
}

Ristić, M., Samaržija-Jovanović, S., Jovanović, V., Kostić, M., Jovanović, T., Marković, G.,& Marinović-Cincović, M.. (2023). Zeolite and Bentonite as Formaldehyde Scavengers in Urea-Formaldehyde Resins. in 15th International symposium „Novel technologies and sustainable development" : Book of Abstracts
Leskovac : Faculty of Technology, University of Niš., 111-111.
https://hdl.handle.net/21.15107/rcub_vinar_12252

Ristić M, Samaržija-Jovanović S, Jovanović V, Kostić M, Jovanović T, Marković G, Marinović-Cincović M. Zeolite and Bentonite as Formaldehyde Scavengers in Urea-Formaldehyde Resins. in 15th International symposium „Novel technologies and sustainable development" : Book of Abstracts. 2023;:111-111.
https://hdl.handle.net/21.15107/rcub_vinar_12252 .

Ristić, Mirjana, Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Kostić, Marija, Jovanović, Tijana, Marković, Gordana, Marinović-Cincović, Milena, "Zeolite and Bentonite as Formaldehyde Scavengers in Urea-Formaldehyde Resins" in 15th International symposium „Novel technologies and sustainable development" : Book of Abstracts (2023):111-111,
https://hdl.handle.net/21.15107/rcub_vinar_12252 .

TY  - CONF
AU  - Ristić, Mirjana
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Petković, Branka
AU  - Kostić, Marija
AU  - Jovanović, Tijana
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11113
AB  - Fig (Ficus carica L.) is a fruit of the Moraceae family, which is mostly grown in subtropical regions, but also grows in Serbia. Fig trees are usually grown in warm and dry climates. According to the FAO world production of figs is stable, with a decade-long average of about 1.1 million tons a year. Fig pomace are formed after fermentation of this fruit which is used for the preparation of brandy. The brandy industry generates huge amounts of pomace as industrial waste, so pyrolysis as thermochemical technologies was used for organic agro-industrial waste treatment. Biochar produced by pyrolysis of fig pomace at 500 °C were characterized and investigated as adsorbents for the removal of Pb2+ ions from aqueous solution. Fig pomace before and after pyrolysis was characterized using proximate, inorganic and elemental analysis, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and differential thermal analysis (DTA). Biochar has a carbon matrix with a high degree of porosity and large surface area, suggesting that it can be used as a surface adsorbent and thus have a significant role in controlling environmental contaminants. The surface modification by gamma irradiation was done to enhance the adsorption capacity of biochar. The Pb2+ ions contents in aqueous solution were analyzed using ICP-OES. The adsorption capacity was estimated using the Freundlich and Langmuir model. The results of this work suggest that pyrolysis and irradiation of biomass is a promising way to produce efficient heavy metal sorbents for waste-water treatment.
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro
T1  - Cross-linked bio/inorganically modified urea-formaldehyde
resins: Influence of γ-radiation on formaldehyde content
SP  - 61
DO  - 10.21175/rad.spr.abstr.book.2022.16.5
ER  - 

@conference{
author = "Ristić, Mirjana and Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Petković, Branka and Kostić, Marija and Jovanović, Tijana and Marković, Gordana and Marinović-Cincović, Milena",
year = "2022",
abstract = "Fig (Ficus carica L.) is a fruit of the Moraceae family, which is mostly grown in subtropical regions, but also grows in Serbia. Fig trees are usually grown in warm and dry climates. According to the FAO world production of figs is stable, with a decade-long average of about 1.1 million tons a year. Fig pomace are formed after fermentation of this fruit which is used for the preparation of brandy. The brandy industry generates huge amounts of pomace as industrial waste, so pyrolysis as thermochemical technologies was used for organic agro-industrial waste treatment. Biochar produced by pyrolysis of fig pomace at 500 °C were characterized and investigated as adsorbents for the removal of Pb2+ ions from aqueous solution. Fig pomace before and after pyrolysis was characterized using proximate, inorganic and elemental analysis, Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), X-ray diffraction (XRD), thermogravimetric analysis (TGA) and differential thermal analysis (DTA). Biochar has a carbon matrix with a high degree of porosity and large surface area, suggesting that it can be used as a surface adsorbent and thus have a significant role in controlling environmental contaminants. The surface modification by gamma irradiation was done to enhance the adsorption capacity of biochar. The Pb2+ ions contents in aqueous solution were analyzed using ICP-OES. The adsorption capacity was estimated using the Freundlich and Langmuir model. The results of this work suggest that pyrolysis and irradiation of biomass is a promising way to produce efficient heavy metal sorbents for waste-water treatment.",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro",
title = "Cross-linked bio/inorganically modified urea-formaldehyde
resins: Influence of γ-radiation on formaldehyde content",
pages = "61",
doi = "10.21175/rad.spr.abstr.book.2022.16.5"
}

Ristić, M., Samaržija-Jovanović, S., Jovanović, V., Petković, B., Kostić, M., Jovanović, T., Marković, G.,& Marinović-Cincović, M.. (2022). Cross-linked bio/inorganically modified urea-formaldehyde
resins: Influence of γ-radiation on formaldehyde content. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro
RAD Centre, Niš, Serbia., 61.
https://doi.org/10.21175/rad.spr.abstr.book.2022.16.5

Ristić M, Samaržija-Jovanović S, Jovanović V, Petković B, Kostić M, Jovanović T, Marković G, Marinović-Cincović M. Cross-linked bio/inorganically modified urea-formaldehyde
resins: Influence of γ-radiation on formaldehyde content. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro. 2022;:61.
doi:10.21175/rad.spr.abstr.book.2022.16.5 .

Ristić, Mirjana, Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Petković, Branka, Kostić, Marija, Jovanović, Tijana, Marković, Gordana, Marinović-Cincović, Milena, "Cross-linked bio/inorganically modified urea-formaldehyde
resins: Influence of γ-radiation on formaldehyde content" in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; June 13-17; Herceg Novi, Montenegro (2022):61,
https://doi.org/10.21175/rad.spr.abstr.book.2022.16.5 . .

TY  - CONF
AU  - Ristić, Mirjana
AU  - Samaržija-Jovanović, Suzana
AU  - Jovanović, Vojislav
AU  - Kostić, Marija
AU  - Jovanović, Tijana
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12248
AB  - The effect of different montmorillonites (KSF and K10) and their modifications (Na-KSF, Na-K10) on content of formaldehyde-FA (free and liberated) modified urea-formaldehyde (UF) composites was investigated. KSF and K10 were modified by sodium chloride (NaCl). A total of four samples were synthesized, with the designations UF/KSF, UF/Na-KSF, UF/K10, and UF/Na-K10, under the same conditions. The content of free FA was determined by the bisulfite method. The hydrolytic stability of modified UF resin was determined by measuring the concentration of liberated FA of modified UF composites after acid hydrolysis. The specific surface area of the tested montmorillonites was determined by the Sear's method. Higher values of specific surface area were obtained for pure KSF (149.4 m2/g) compared to modified Na-KSF (48.6 m2/g). Specific surface area for pure K10 was 111 m 2/g, compared to value of 71 m2/g for modified Na-K10. The amount of free and liberated FA was 0.4%, 0.12% and 1.2% and 2.3%, respectively for UF/KSF and UF/Na-KSF composite. The values for free FA for UF/K10 and UF/Na-K10 composite are the same and amount to 0.6%. It was concluded that the UF/Na-KSF composite has a smaller content of free FA (0.12%) compared to other UF composites. The UF/KSF composite has a higher resistance to acidic hydrolysis and lower liberated FA percent (1.2%).
PB  - Novi Sad : University of Novi Sad, Faculty of Technology
C3  - 2nd International Conference on Advanced Production and Processing : the book of abstracts; Oct 20-22, Novi Sad
T1  - Influence of modified montmorillonites on formaldehyde content in urea-formaldehyde/montmorillonite composites
SP  - 122
EP  - 122
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12248
ER  - 

@conference{
author = "Ristić, Mirjana and Samaržija-Jovanović, Suzana and Jovanović, Vojislav and Kostić, Marija and Jovanović, Tijana and Marković, Gordana and Marinović-Cincović, Milena",
year = "2022",
abstract = "The effect of different montmorillonites (KSF and K10) and their modifications (Na-KSF, Na-K10) on content of formaldehyde-FA (free and liberated) modified urea-formaldehyde (UF) composites was investigated. KSF and K10 were modified by sodium chloride (NaCl). A total of four samples were synthesized, with the designations UF/KSF, UF/Na-KSF, UF/K10, and UF/Na-K10, under the same conditions. The content of free FA was determined by the bisulfite method. The hydrolytic stability of modified UF resin was determined by measuring the concentration of liberated FA of modified UF composites after acid hydrolysis. The specific surface area of the tested montmorillonites was determined by the Sear's method. Higher values of specific surface area were obtained for pure KSF (149.4 m2/g) compared to modified Na-KSF (48.6 m2/g). Specific surface area for pure K10 was 111 m 2/g, compared to value of 71 m2/g for modified Na-K10. The amount of free and liberated FA was 0.4%, 0.12% and 1.2% and 2.3%, respectively for UF/KSF and UF/Na-KSF composite. The values for free FA for UF/K10 and UF/Na-K10 composite are the same and amount to 0.6%. It was concluded that the UF/Na-KSF composite has a smaller content of free FA (0.12%) compared to other UF composites. The UF/KSF composite has a higher resistance to acidic hydrolysis and lower liberated FA percent (1.2%).",
publisher = "Novi Sad : University of Novi Sad, Faculty of Technology",
journal = "2nd International Conference on Advanced Production and Processing : the book of abstracts; Oct 20-22, Novi Sad",
title = "Influence of modified montmorillonites on formaldehyde content in urea-formaldehyde/montmorillonite composites",
pages = "122-122",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12248"
}

Ristić, M., Samaržija-Jovanović, S., Jovanović, V., Kostić, M., Jovanović, T., Marković, G.,& Marinović-Cincović, M.. (2022). Influence of modified montmorillonites on formaldehyde content in urea-formaldehyde/montmorillonite composites. in 2nd International Conference on Advanced Production and Processing : the book of abstracts; Oct 20-22, Novi Sad
Novi Sad : University of Novi Sad, Faculty of Technology., 122-122.
https://hdl.handle.net/21.15107/rcub_vinar_12248

Ristić M, Samaržija-Jovanović S, Jovanović V, Kostić M, Jovanović T, Marković G, Marinović-Cincović M. Influence of modified montmorillonites on formaldehyde content in urea-formaldehyde/montmorillonite composites. in 2nd International Conference on Advanced Production and Processing : the book of abstracts; Oct 20-22, Novi Sad. 2022;:122-122.
https://hdl.handle.net/21.15107/rcub_vinar_12248 .

Ristić, Mirjana, Samaržija-Jovanović, Suzana, Jovanović, Vojislav, Kostić, Marija, Jovanović, Tijana, Marković, Gordana, Marinović-Cincović, Milena, "Influence of modified montmorillonites on formaldehyde content in urea-formaldehyde/montmorillonite composites" in 2nd International Conference on Advanced Production and Processing : the book of abstracts; Oct 20-22, Novi Sad (2022):122-122,
https://hdl.handle.net/21.15107/rcub_vinar_12248 .

TY  - CONF
AU  - Jovanović, Vojislav
AU  - Samaržija-Jovanović, Suzana
AU  - Petković, Branka
AU  - Jovanović, Tijana
AU  - Marković, Gordana
AU  - Marinović-Cincović, Milena
AU  - Teofilović, Vesna
PY  - 2021
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11125
AB  - The montmorillonite as a 2:1 smectite type clay has two tetrahedral sheets of silica sandwiching the alumina octahedral sheet. The particles of this mineral are plate-shaped with the thickness of 0.96 nm and an average diameter about 1 μm. This type of clay (K10) is using to improve the characteristics of different materials in the fields of catalysis, food additives, polymers, sorbents, etc. In this study thermally activated montmorillonite (DK10) was used because the thermal treatment alters its properties. The degree of activation was determined using specific surface measurement (Sear’s method). The specific surface area (SSA) of K10 was 119 m2/g but after the thermal treatmant it was 317.4 m2/g. The effect of UV-irradiation on the thermal stability of a urea-formaldehide resin (UF) nanocomposites based on DTK10 was assessed. For this purpose UF nanocomposites were synthesized and irradiated using UV light at two wavelengths l (254 and 366 nm). Characterization of nanocomposites with modified and not modified clay was performed using XRD, FTIR, and TG/DTA analysis. The peaks at 2q values of 26.74, 26.6, 26.54, 26.6 originate from quartz in sample DTK10, non-irradiated UF/DTK10 and UV-irradiated sample at l=254 nm and l= 366nm, respectively. From the IR spectra it was assessed that intensity of the carboxyl group at 1630 cm−1 decreased with UVirradiation in modified nanocomposite. The aliphatic stretch band about 2956 cm−1 and –C–O band at 1130 cm−1 also decreases due to the formation of hydrogen bonds with the hydroxyl groups on the DTK10 surface. Based on thermogravimetric measurements it was estimated that before and after UV-irradiation modified UF/DTK10 nanocomposites have almost identical temperature intervals in which degradation processes are occurred. The total mass loss for non-irradiated and irradiated UF/DTK10 was 60.18, 55.26 and 58.6%, respectively
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro
T1  - The effect of UV-irradiation on the thermal stability of modified urea-formaldehyde resins with thermally activated montmorillonite
SP  - 103
DO  - 10.21175/rad.abstr.book.2021.15.19
ER  - 

@conference{
author = "Jovanović, Vojislav and Samaržija-Jovanović, Suzana and Petković, Branka and Jovanović, Tijana and Marković, Gordana and Marinović-Cincović, Milena and Teofilović, Vesna",
year = "2021",
abstract = "The montmorillonite as a 2:1 smectite type clay has two tetrahedral sheets of silica sandwiching the alumina octahedral sheet. The particles of this mineral are plate-shaped with the thickness of 0.96 nm and an average diameter about 1 μm. This type of clay (K10) is using to improve the characteristics of different materials in the fields of catalysis, food additives, polymers, sorbents, etc. In this study thermally activated montmorillonite (DK10) was used because the thermal treatment alters its properties. The degree of activation was determined using specific surface measurement (Sear’s method). The specific surface area (SSA) of K10 was 119 m2/g but after the thermal treatmant it was 317.4 m2/g. The effect of UV-irradiation on the thermal stability of a urea-formaldehide resin (UF) nanocomposites based on DTK10 was assessed. For this purpose UF nanocomposites were synthesized and irradiated using UV light at two wavelengths l (254 and 366 nm). Characterization of nanocomposites with modified and not modified clay was performed using XRD, FTIR, and TG/DTA analysis. The peaks at 2q values of 26.74, 26.6, 26.54, 26.6 originate from quartz in sample DTK10, non-irradiated UF/DTK10 and UV-irradiated sample at l=254 nm and l= 366nm, respectively. From the IR spectra it was assessed that intensity of the carboxyl group at 1630 cm−1 decreased with UVirradiation in modified nanocomposite. The aliphatic stretch band about 2956 cm−1 and –C–O band at 1130 cm−1 also decreases due to the formation of hydrogen bonds with the hydroxyl groups on the DTK10 surface. Based on thermogravimetric measurements it was estimated that before and after UV-irradiation modified UF/DTK10 nanocomposites have almost identical temperature intervals in which degradation processes are occurred. The total mass loss for non-irradiated and irradiated UF/DTK10 was 60.18, 55.26 and 58.6%, respectively",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro",
title = "The effect of UV-irradiation on the thermal stability of modified urea-formaldehyde resins with thermally activated montmorillonite",
pages = "103",
doi = "10.21175/rad.abstr.book.2021.15.19"
}

Jovanović, V., Samaržija-Jovanović, S., Petković, B., Jovanović, T., Marković, G., Marinović-Cincović, M.,& Teofilović, V.. (2021). The effect of UV-irradiation on the thermal stability of modified urea-formaldehyde resins with thermally activated montmorillonite. in RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro
RAD Centre, Niš, Serbia., 103.
https://doi.org/10.21175/rad.abstr.book.2021.15.19

Jovanović V, Samaržija-Jovanović S, Petković B, Jovanović T, Marković G, Marinović-Cincović M, Teofilović V. The effect of UV-irradiation on the thermal stability of modified urea-formaldehyde resins with thermally activated montmorillonite. in RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro. 2021;:103.
doi:10.21175/rad.abstr.book.2021.15.19 .

Jovanović, Vojislav, Samaržija-Jovanović, Suzana, Petković, Branka, Jovanović, Tijana, Marković, Gordana, Marinović-Cincović, Milena, Teofilović, Vesna, "The effect of UV-irradiation on the thermal stability of modified urea-formaldehyde resins with thermally activated montmorillonite" in RAD 2021 : 9th International Conference on Radiation in Various Fields of Research : book of abstracts; June 14-18; Herceg Novi, Montenegro (2021):103,
https://doi.org/10.21175/rad.abstr.book.2021.15.19 . .