TY  - CONF
AU  - Pergal, M. V.
AU  - Kodranov, Igor D.
AU  - Pergal, M. M.
AU  - Manojlović, Dragan D.
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4919
AB  - Drinking water and wastewater treatment facilities often have a chemical oxidationstep for disinfection, the removal of organic micropollutants, color removal and taste andodor control. Among the most commonly used oxidants are chlorine dioxide (ClO2 ), chlorine, and ozone.ClO2  has been increasinglyemployed as disinfectant in water treatment due to its antibacterial and antiviral properties. As a powerful oxidant, ClO2  can remove many organic and inorganic pollutants [1,2]. The aim of the present study was to assess thepotential of ClO2  to oxidize pharmaceutical during water treatment. Therefore, degradation of ibuprofen (IBP) using ClO2 in water was investigated.The degradation under different reaction conditions (concentration of ClO2 : 5, 10, 15 mg/L; concentration of ibuprofen: 10, 20, 35, 60 mg/L; reaction time: from 0.5 to 24 h; pH values: 3, 7, 10) was monitored using high performance liquid chromatography (HPLC) analysis, while mineralization degree was detemined by total organic carbon (TOC) measurements. The highest degree of IBPdegradation in deionized water was obtained by treatment with 15 mg/L ClO2 , using 10 mg/L ibuprofen, at pH = 10, after 24 h of treatment. The obtained degradation degree value under optimal conditions was 99%. TOC analysis of ibuprofen showed reduction in content of organic carbon in the solution. Before degradation TOC content was 7.8 mg/L and after 5.6 mg/L. This showes that degradation and mineralization of ibuprofen occur during this process. The degradation products obtained under optimal conditions were analyzed and confirmed by gas chromatography–mass spectra (GC–MS) and the reaction pathwayswere proposed.From GC chromatograms, degradation products of ibuprofen appeared at following retention times: 4.35 min, 5.12 min, 6.76 min, and 7.05 min. After the analysis of mass spectra, based on the spectral characteristics and the ratio of mass and charge (m/z), it was determined that there are four main degradation products of ibuprofen, after treatment with ClO2.The first characteristic ion appeared at 6.76 min and has m/z 163 (2-(4-methylphenyl) propionic acid). In further degradation path, two products are formed, one of which is a characteristic ion with m/z 57 (2-methylpropane) at 4.36 min, while the other product is further decomposed to give two new products, one of which is also a characteristic ion with m/z 57 (acetic acid) at 5.21 min. Another characteristic ion having m/z 161 (1-ethyl-4-isobutylbenzene) appeared at 7.05 min. ClO2 treatment is an efficient method for IBP degradation.The findings of the present study are very useful for the treatment of drinking waters contaminated with pharmaceutical.
PB  - Belgrade : Serbian Chemical Society
C3  - Book of Abstracts 21st; European Meeting on Environmental Chemistry
T1  - GC/MS and TOC Analyses of Ibuprofen after Degradation in Waterusing Chlorine Dioxide
SP  - 128
EP  - 128
UR  - https://hdl.handle.net/21.15107/rcub_cherry_4919
ER  - 

@conference{
author = "Pergal, M. V. and Kodranov, Igor D. and Pergal, M. M. and Manojlović, Dragan D.",
year = "2021",
abstract = "Drinking water and wastewater treatment facilities often have a chemical oxidationstep for disinfection, the removal of organic micropollutants, color removal and taste andodor control. Among the most commonly used oxidants are chlorine dioxide (ClO2 ), chlorine, and ozone.ClO2  has been increasinglyemployed as disinfectant in water treatment due to its antibacterial and antiviral properties. As a powerful oxidant, ClO2  can remove many organic and inorganic pollutants [1,2]. The aim of the present study was to assess thepotential of ClO2  to oxidize pharmaceutical during water treatment. Therefore, degradation of ibuprofen (IBP) using ClO2 in water was investigated.The degradation under different reaction conditions (concentration of ClO2 : 5, 10, 15 mg/L; concentration of ibuprofen: 10, 20, 35, 60 mg/L; reaction time: from 0.5 to 24 h; pH values: 3, 7, 10) was monitored using high performance liquid chromatography (HPLC) analysis, while mineralization degree was detemined by total organic carbon (TOC) measurements. The highest degree of IBPdegradation in deionized water was obtained by treatment with 15 mg/L ClO2 , using 10 mg/L ibuprofen, at pH = 10, after 24 h of treatment. The obtained degradation degree value under optimal conditions was 99%. TOC analysis of ibuprofen showed reduction in content of organic carbon in the solution. Before degradation TOC content was 7.8 mg/L and after 5.6 mg/L. This showes that degradation and mineralization of ibuprofen occur during this process. The degradation products obtained under optimal conditions were analyzed and confirmed by gas chromatography–mass spectra (GC–MS) and the reaction pathwayswere proposed.From GC chromatograms, degradation products of ibuprofen appeared at following retention times: 4.35 min, 5.12 min, 6.76 min, and 7.05 min. After the analysis of mass spectra, based on the spectral characteristics and the ratio of mass and charge (m/z), it was determined that there are four main degradation products of ibuprofen, after treatment with ClO2.The first characteristic ion appeared at 6.76 min and has m/z 163 (2-(4-methylphenyl) propionic acid). In further degradation path, two products are formed, one of which is a characteristic ion with m/z 57 (2-methylpropane) at 4.36 min, while the other product is further decomposed to give two new products, one of which is also a characteristic ion with m/z 57 (acetic acid) at 5.21 min. Another characteristic ion having m/z 161 (1-ethyl-4-isobutylbenzene) appeared at 7.05 min. ClO2 treatment is an efficient method for IBP degradation.The findings of the present study are very useful for the treatment of drinking waters contaminated with pharmaceutical.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Book of Abstracts 21st; European Meeting on Environmental Chemistry",
title = "GC/MS and TOC Analyses of Ibuprofen after Degradation in Waterusing Chlorine Dioxide",
pages = "128-128",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4919"
}

Pergal, M. V., Kodranov, I. D., Pergal, M. M.,& Manojlović, D. D.. (2021). GC/MS and TOC Analyses of Ibuprofen after Degradation in Waterusing Chlorine Dioxide. in Book of Abstracts 21st; European Meeting on Environmental Chemistry
Belgrade : Serbian Chemical Society., 128-128.
https://hdl.handle.net/21.15107/rcub_cherry_4919

Pergal MV, Kodranov ID, Pergal MM, Manojlović DD. GC/MS and TOC Analyses of Ibuprofen after Degradation in Waterusing Chlorine Dioxide. in Book of Abstracts 21st; European Meeting on Environmental Chemistry. 2021;:128-128.
https://hdl.handle.net/21.15107/rcub_cherry_4919 .

Pergal, M. V., Kodranov, Igor D., Pergal, M. M., Manojlović, Dragan D., "GC/MS and TOC Analyses of Ibuprofen after Degradation in Waterusing Chlorine Dioxide" in Book of Abstracts 21st; European Meeting on Environmental Chemistry (2021):128-128,
https://hdl.handle.net/21.15107/rcub_cherry_4919 .

TY  - CONF
AU  - Pergal, M.V.
AU  - Gojgić-Cvijović, Gordana D.
AU  - Kodranov, Igor D.
AU  - Manojlović, Dragan D.
AU  - Špírková, M.
PY  - 2021
UR  - http://cherry.chem.bg.ac.rs/handle/123456789/4926
AB  - The first series of polyurethane network nanocomposites (PUNN) was prepared by in situ polymerization [1,2] from poly(dimethylsiloxane)-based prepolymer as the soft segment and 4,4’-methylene diphenyldiisocyanate and hyperbranched polyester of the third pseudo generation as the hard segment, in the presence of organically modified montmorillonite nanofiller (Cloisite 30B; 0.5 wt.%). The second series of pure polyurethane networks (PUN) without organoclay was also prepared. The composition of prepared materials in both series was varied through variation of soft segment content from 30 to 60 wt.%. Biodegradability of prepared materials was measured using mixed cultures of microorganisms that originated from soil. This test used soil bacteria and fungi to assess the impact of the environment on polymer compounds. This test is intended to determine which polymer compositions are best suited for coating other materials that must endure lengthy exposure to harsh environmental conditions while retaining their principal functionalities. The biodegradation test was performed under aerobic conditions in the dark condition and in a thermostat at 28 °C. Bacterial and fungal mixed cultures were alternated monthly. After 3 and 6 months of the test, the materials were washed with water, dried in a vacuum oven to constant weight, and used for gravimetric measurements of weight loss. The prepared materials before and after biodegradation test were characterized by FTIR spectroscopy. The results showed that pure PUNs (18.35-18.66 wt.% after six months) possess the highest weight loss as compared to PUNNs (from 7.53 to 14.78 wt.% after six months) after incubation of up to six months. PUNN films had lower biodegradation degree as compared the pure PUN films. Biodegradability was lower for materials with lower soft segment content. In FTIR spectra of PUNN after biodegradation differences were noted at approximately 1700-1735 and 3324 cm-1. The structures contributing to strong hydrogen bonds were partially destroyed during the biodegradation process. The results showed that PUNN with 40 wt.% of soft segment (PUNN-40) is the most resistance material to biodegradation. The reason was probably due to more hydrogen bonding between the polymer and Cloisite 30B organoclay and its better mechanical properties of PUNN-40 sample as compared to other prepared PUNN materials. The obtained materials are good candidate as top coating materials exposed to the environmental conditions.
PB  - Belgrade : Serbian Chemical Society
C3  - Book of Abstracts 21st; European Meeting on Environmental Chemistry
T1  - Biodegradation Assessment of Poly(Urethane-Dimethylsiloxane)/Organoclay Nanocomposites under Environmental Conditions
SP  - 154
EP  - 154
UR  - https://hdl.handle.net/21.15107/rcub_cherry_4926
ER  - 

@conference{
author = "Pergal, M.V. and Gojgić-Cvijović, Gordana D. and Kodranov, Igor D. and Manojlović, Dragan D. and Špírková, M.",
year = "2021",
abstract = "The first series of polyurethane network nanocomposites (PUNN) was prepared by in situ polymerization [1,2] from poly(dimethylsiloxane)-based prepolymer as the soft segment and 4,4’-methylene diphenyldiisocyanate and hyperbranched polyester of the third pseudo generation as the hard segment, in the presence of organically modified montmorillonite nanofiller (Cloisite 30B; 0.5 wt.%). The second series of pure polyurethane networks (PUN) without organoclay was also prepared. The composition of prepared materials in both series was varied through variation of soft segment content from 30 to 60 wt.%. Biodegradability of prepared materials was measured using mixed cultures of microorganisms that originated from soil. This test used soil bacteria and fungi to assess the impact of the environment on polymer compounds. This test is intended to determine which polymer compositions are best suited for coating other materials that must endure lengthy exposure to harsh environmental conditions while retaining their principal functionalities. The biodegradation test was performed under aerobic conditions in the dark condition and in a thermostat at 28 °C. Bacterial and fungal mixed cultures were alternated monthly. After 3 and 6 months of the test, the materials were washed with water, dried in a vacuum oven to constant weight, and used for gravimetric measurements of weight loss. The prepared materials before and after biodegradation test were characterized by FTIR spectroscopy. The results showed that pure PUNs (18.35-18.66 wt.% after six months) possess the highest weight loss as compared to PUNNs (from 7.53 to 14.78 wt.% after six months) after incubation of up to six months. PUNN films had lower biodegradation degree as compared the pure PUN films. Biodegradability was lower for materials with lower soft segment content. In FTIR spectra of PUNN after biodegradation differences were noted at approximately 1700-1735 and 3324 cm-1. The structures contributing to strong hydrogen bonds were partially destroyed during the biodegradation process. The results showed that PUNN with 40 wt.% of soft segment (PUNN-40) is the most resistance material to biodegradation. The reason was probably due to more hydrogen bonding between the polymer and Cloisite 30B organoclay and its better mechanical properties of PUNN-40 sample as compared to other prepared PUNN materials. The obtained materials are good candidate as top coating materials exposed to the environmental conditions.",
publisher = "Belgrade : Serbian Chemical Society",
journal = "Book of Abstracts 21st; European Meeting on Environmental Chemistry",
title = "Biodegradation Assessment of Poly(Urethane-Dimethylsiloxane)/Organoclay Nanocomposites under Environmental Conditions",
pages = "154-154",
url = "https://hdl.handle.net/21.15107/rcub_cherry_4926"
}

Pergal, M.V., Gojgić-Cvijović, G. D., Kodranov, I. D., Manojlović, D. D.,& Špírková, M.. (2021). Biodegradation Assessment of Poly(Urethane-Dimethylsiloxane)/Organoclay Nanocomposites under Environmental Conditions. in Book of Abstracts 21st; European Meeting on Environmental Chemistry
Belgrade : Serbian Chemical Society., 154-154.
https://hdl.handle.net/21.15107/rcub_cherry_4926

Pergal M, Gojgić-Cvijović GD, Kodranov ID, Manojlović DD, Špírková M. Biodegradation Assessment of Poly(Urethane-Dimethylsiloxane)/Organoclay Nanocomposites under Environmental Conditions. in Book of Abstracts 21st; European Meeting on Environmental Chemistry. 2021;:154-154.
https://hdl.handle.net/21.15107/rcub_cherry_4926 .

Pergal, M.V., Gojgić-Cvijović, Gordana D., Kodranov, Igor D., Manojlović, Dragan D., Špírková, M., "Biodegradation Assessment of Poly(Urethane-Dimethylsiloxane)/Organoclay Nanocomposites under Environmental Conditions" in Book of Abstracts 21st; European Meeting on Environmental Chemistry (2021):154-154,
https://hdl.handle.net/21.15107/rcub_cherry_4926 .