TY  - JOUR
AU  - Cao, Ying
AU  - Yao, Jun
AU  - Šolević Knudsen, Tatjana
AU  - Pang, Wancheng
AU  - Zhu, Junjie
AU  - Liu, Bang
AU  - Li, Hao
AU  - Li, Miaomiao
AU  - Su, Jianchao
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5580
AB  - UV-assisted advanced oxidation processes (AOPs) are widely used and studied in degradation of bisphenol A (BPA). However, detailed information on their radical chemistry and degradation mechanisms is still lacking. In this study, degradation of BPA was comparatively evaluated to investigate the radical mechanisms, products and the toxicity variation in UV/chlorine and UV/H2O2 processes. In comparison with UV/H2O2, UV/chlorine had a higher BPA degradation efficiency and higher pH-dependency due to chlorination and the synergy of •OH and RCS. The •OH and Cl• played a pivotal role as the primary radicals in BPA degradation by UV/chlorine process at all pH investigated (6–8). The relative contributions of the secondary radicals ClO• gradually decreased with a variation of pH from 6 to 8 in this process. Presence of HCO3─ and HA inhibited BPA degradation to different extents in UV/chlorine process, while the effect of Cl─ could be neglected. According to the identified transformation products, chlorination (major), hydroxylation and breakage of the isopropylidene chain were BPA decomposition pathways in the UV/chlorine system. In the UV/H2O2 system, only hydroxylation (major) and breakage of the isopropylidene chain occurred. The toxicity analysis, based on the proposed degradation pathways, indicated that the generation of chlorinated products in the UV/chlorine system led to a higher toxicity of the resulting mixture than in the UV/H2O2 system. Although UV/chlorine has an excellent BPA degradation effect and it is cost-effective, the possible environmental risk should be carefully considered when UV/chlorine system is used to remove BPA in real waters.
PB  - Elsevier BV
T2  - Chemosphere
T1  - Radical chemistry, degradation mechanism and toxicity evolution of BPA in the UV/chlorine and UV/H2O2
VL  - 312
SP  - 137169
DO  - 10.1016/j.chemosphere.2022.137169
ER  - 

@article{
author = "Cao, Ying and Yao, Jun and Šolević Knudsen, Tatjana and Pang, Wancheng and Zhu, Junjie and Liu, Bang and Li, Hao and Li, Miaomiao and Su, Jianchao",
year = "2023",
abstract = "UV-assisted advanced oxidation processes (AOPs) are widely used and studied in degradation of bisphenol A (BPA). However, detailed information on their radical chemistry and degradation mechanisms is still lacking. In this study, degradation of BPA was comparatively evaluated to investigate the radical mechanisms, products and the toxicity variation in UV/chlorine and UV/H2O2 processes. In comparison with UV/H2O2, UV/chlorine had a higher BPA degradation efficiency and higher pH-dependency due to chlorination and the synergy of •OH and RCS. The •OH and Cl• played a pivotal role as the primary radicals in BPA degradation by UV/chlorine process at all pH investigated (6–8). The relative contributions of the secondary radicals ClO• gradually decreased with a variation of pH from 6 to 8 in this process. Presence of HCO3─ and HA inhibited BPA degradation to different extents in UV/chlorine process, while the effect of Cl─ could be neglected. According to the identified transformation products, chlorination (major), hydroxylation and breakage of the isopropylidene chain were BPA decomposition pathways in the UV/chlorine system. In the UV/H2O2 system, only hydroxylation (major) and breakage of the isopropylidene chain occurred. The toxicity analysis, based on the proposed degradation pathways, indicated that the generation of chlorinated products in the UV/chlorine system led to a higher toxicity of the resulting mixture than in the UV/H2O2 system. Although UV/chlorine has an excellent BPA degradation effect and it is cost-effective, the possible environmental risk should be carefully considered when UV/chlorine system is used to remove BPA in real waters.",
publisher = "Elsevier BV",
journal = "Chemosphere",
title = "Radical chemistry, degradation mechanism and toxicity evolution of BPA in the UV/chlorine and UV/H2O2",
volume = "312",
pages = "137169",
doi = "10.1016/j.chemosphere.2022.137169"
}

Cao, Y., Yao, J., Šolević Knudsen, T., Pang, W., Zhu, J., Liu, B., Li, H., Li, M.,& Su, J.. (2023). Radical chemistry, degradation mechanism and toxicity evolution of BPA in the UV/chlorine and UV/H2O2. in Chemosphere
Elsevier BV., 312, 137169.
https://doi.org/10.1016/j.chemosphere.2022.137169

Cao Y, Yao J, Šolević Knudsen T, Pang W, Zhu J, Liu B, Li H, Li M, Su J. Radical chemistry, degradation mechanism and toxicity evolution of BPA in the UV/chlorine and UV/H2O2. in Chemosphere. 2023;312:137169.
doi:10.1016/j.chemosphere.2022.137169 .

Cao, Ying, Yao, Jun, Šolević Knudsen, Tatjana, Pang, Wancheng, Zhu, Junjie, Liu, Bang, Li, Hao, Li, Miaomiao, Su, Jianchao, "Radical chemistry, degradation mechanism and toxicity evolution of BPA in the UV/chlorine and UV/H2O2" in Chemosphere, 312 (2023):137169,
https://doi.org/10.1016/j.chemosphere.2022.137169 . .

TY  - JOUR
AU  - Pang, Wancheng
AU  - Yao, Jun
AU  - Šolević Knudsen, Tatjana
AU  - Cao, Ying
AU  - Liu, Bang
AU  - Li, Hao
AU  - Li, Miaomiao
AU  - Zhu, Junjie
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5331
AB  - This work systematically studied the kinetics and mechanism of degradation of salicylhydroxamic acid (SHA), benzhydroxamic acid (BHA) and N-hydroxyphthalimide (NOP) by UVA-B/H2O2 and UVA-B/peroxodisulfate (PDS). UVA-B irradiation could induce a direct photolysis of SHA and dominated SHA destruction in both systems. BHA and NOP were effectively degraded via HO•- and SO4•−-mediated oxidation. UVA-B/PDS displayed a better degradation performance for HAAs investigated than UVA-B/H2O2. An acidic pH was more suitable for three HAAs removal in the UVA-B/H2O2 system. However, basic pH was more efficient for HAAs degradation in the UVA-B/PDS system. The degradation of BHA and NOP was predominantly driven by SO4•− at all pH levels used (5.0–9.0). The second-order rate constants for SHA, BHA and NOP reactions with HO• and SO4•− were calculated to be (4.16–5.22) × 109 M−1•s−1 and (1.19–7.22) × 109 M−1•s−1, respectively. Presence of various water constituents had different influence on HAA removal, with a enhancement in the presence of HCO3–, Fe2+ and Cu2+. When real waters were used as a background, dissolved organic carbon and Cl− were the main factors that consumed radicals and affected the degradation performance of HAAs. Analysis of the transformation products and density functional theory revealed that all of the investigated HAAs first generated amidated products but the formation mechanisms might have been different. HAAs degradation pathways mainly included hydrolysis, hydroxylation, decarboxylation and ring opening processes. Toxicity evaluation showed that the UV/AOP degradation of HAAs generated some transformation products with higher acute toxicity than the parent compounds.
PB  - Elsevier
T2  - Chemical Engineering Journal
T1  - Degradation of three typical hydroxamic acids collectors via UVA-B activated H2O2 and persulfate: Kinetics, transformation pathway, DFT calculation and toxicity evaluation
VL  - 451
SP  - 138639
DO  - 10.1016/j.cej.2022.138639
ER  - 

@article{
author = "Pang, Wancheng and Yao, Jun and Šolević Knudsen, Tatjana and Cao, Ying and Liu, Bang and Li, Hao and Li, Miaomiao and Zhu, Junjie",
year = "2023",
abstract = "This work systematically studied the kinetics and mechanism of degradation of salicylhydroxamic acid (SHA), benzhydroxamic acid (BHA) and N-hydroxyphthalimide (NOP) by UVA-B/H2O2 and UVA-B/peroxodisulfate (PDS). UVA-B irradiation could induce a direct photolysis of SHA and dominated SHA destruction in both systems. BHA and NOP were effectively degraded via HO•- and SO4•−-mediated oxidation. UVA-B/PDS displayed a better degradation performance for HAAs investigated than UVA-B/H2O2. An acidic pH was more suitable for three HAAs removal in the UVA-B/H2O2 system. However, basic pH was more efficient for HAAs degradation in the UVA-B/PDS system. The degradation of BHA and NOP was predominantly driven by SO4•− at all pH levels used (5.0–9.0). The second-order rate constants for SHA, BHA and NOP reactions with HO• and SO4•− were calculated to be (4.16–5.22) × 109 M−1•s−1 and (1.19–7.22) × 109 M−1•s−1, respectively. Presence of various water constituents had different influence on HAA removal, with a enhancement in the presence of HCO3–, Fe2+ and Cu2+. When real waters were used as a background, dissolved organic carbon and Cl− were the main factors that consumed radicals and affected the degradation performance of HAAs. Analysis of the transformation products and density functional theory revealed that all of the investigated HAAs first generated amidated products but the formation mechanisms might have been different. HAAs degradation pathways mainly included hydrolysis, hydroxylation, decarboxylation and ring opening processes. Toxicity evaluation showed that the UV/AOP degradation of HAAs generated some transformation products with higher acute toxicity than the parent compounds.",
publisher = "Elsevier",
journal = "Chemical Engineering Journal",
title = "Degradation of three typical hydroxamic acids collectors via UVA-B activated H2O2 and persulfate: Kinetics, transformation pathway, DFT calculation and toxicity evaluation",
volume = "451",
pages = "138639",
doi = "10.1016/j.cej.2022.138639"
}

Pang, W., Yao, J., Šolević Knudsen, T., Cao, Y., Liu, B., Li, H., Li, M.,& Zhu, J.. (2023). Degradation of three typical hydroxamic acids collectors via UVA-B activated H2O2 and persulfate: Kinetics, transformation pathway, DFT calculation and toxicity evaluation. in Chemical Engineering Journal
Elsevier., 451, 138639.
https://doi.org/10.1016/j.cej.2022.138639

Pang W, Yao J, Šolević Knudsen T, Cao Y, Liu B, Li H, Li M, Zhu J. Degradation of three typical hydroxamic acids collectors via UVA-B activated H2O2 and persulfate: Kinetics, transformation pathway, DFT calculation and toxicity evaluation. in Chemical Engineering Journal. 2023;451:138639.
doi:10.1016/j.cej.2022.138639 .

Pang, Wancheng, Yao, Jun, Šolević Knudsen, Tatjana, Cao, Ying, Liu, Bang, Li, Hao, Li, Miaomiao, Zhu, Junjie, "Degradation of three typical hydroxamic acids collectors via UVA-B activated H2O2 and persulfate: Kinetics, transformation pathway, DFT calculation and toxicity evaluation" in Chemical Engineering Journal, 451 (2023):138639,
https://doi.org/10.1016/j.cej.2022.138639 . .

TY  - JOUR
AU  - Pang, Wancheng
AU  - Yao, Jun
AU  - Šolević Knudsen, Tatjana
AU  - Cao, Ying
AU  - Liu, Bang
AU  - Li, Hao
AU  - Li, Miaomiao
AU  - Zhu, Junjie
PY  - 2023
UR  - https://cer.ihtm.bg.ac.rs/handle/123456789/5546
AB  - This work systematically studied the kinetics and mechanism of degradation of salicylhydroxamic acid (SHA), benzhydroxamic acid (BHA) and N-hydroxyphthalimide (NOP) by UVA-B/H2O2 and UVA-B/peroxodisulfate (PDS). UVA-B irradiation could induce a direct photolysis of SHA and dominated SHA destruction in both systems. BHA and NOP were effectively degraded via HO•- and SO4•−-mediated oxidation. UVA-B/PDS displayed a better degradation performance for HAAs investigated than UVA-B/H2O2. An acidic pH was more suitable for three HAAs removal in the UVA-B/H2O2 system. However, basic pH was more efficient for HAAs degradation in the UVA-B/PDS system. The degradation of BHA and NOP was predominantly driven by SO4•− at all pH levels used (5.0–9.0). The second-order rate constants for SHA, BHA and NOP reactions with HO• and SO4•− were calculated to be (4.16–5.22) × 109 M−1•s−1 and (1.19–7.22) × 109 M−1•s−1, respectively. Presence of various water constituents had different influence on HAA removal, with a enhancement in the presence of HCO3–, Fe2+ and Cu2+. When real waters were used as a background, dissolved organic carbon and Cl− were the main factors that consumed radicals and affected the degradation performance of HAAs. Analysis of the transformation products and density functional theory revealed that all of the investigated HAAs first generated amidated products but the formation mechanisms might have been different. HAAs degradation pathways mainly included hydrolysis, hydroxylation, decarboxylation and ring opening processes. Toxicity evaluation showed that the UV/AOP degradation of HAAs generated some transformation products with higher acute toxicity than the parent compounds.
PB  - Elsevier
T2  - Chemical Engineering Journal
T1  - Degradation of three typical hydroxamic acids collectors via UVA-B activated H2O2 and persulfate: Kinetics, transformation pathway, DFT calculation and toxicity evaluation
VL  - 451
SP  - 138639
DO  - 10.1016/j.cej.2022.138639
ER  - 

@article{
author = "Pang, Wancheng and Yao, Jun and Šolević Knudsen, Tatjana and Cao, Ying and Liu, Bang and Li, Hao and Li, Miaomiao and Zhu, Junjie",
year = "2023",
abstract = "This work systematically studied the kinetics and mechanism of degradation of salicylhydroxamic acid (SHA), benzhydroxamic acid (BHA) and N-hydroxyphthalimide (NOP) by UVA-B/H2O2 and UVA-B/peroxodisulfate (PDS). UVA-B irradiation could induce a direct photolysis of SHA and dominated SHA destruction in both systems. BHA and NOP were effectively degraded via HO•- and SO4•−-mediated oxidation. UVA-B/PDS displayed a better degradation performance for HAAs investigated than UVA-B/H2O2. An acidic pH was more suitable for three HAAs removal in the UVA-B/H2O2 system. However, basic pH was more efficient for HAAs degradation in the UVA-B/PDS system. The degradation of BHA and NOP was predominantly driven by SO4•− at all pH levels used (5.0–9.0). The second-order rate constants for SHA, BHA and NOP reactions with HO• and SO4•− were calculated to be (4.16–5.22) × 109 M−1•s−1 and (1.19–7.22) × 109 M−1•s−1, respectively. Presence of various water constituents had different influence on HAA removal, with a enhancement in the presence of HCO3–, Fe2+ and Cu2+. When real waters were used as a background, dissolved organic carbon and Cl− were the main factors that consumed radicals and affected the degradation performance of HAAs. Analysis of the transformation products and density functional theory revealed that all of the investigated HAAs first generated amidated products but the formation mechanisms might have been different. HAAs degradation pathways mainly included hydrolysis, hydroxylation, decarboxylation and ring opening processes. Toxicity evaluation showed that the UV/AOP degradation of HAAs generated some transformation products with higher acute toxicity than the parent compounds.",
publisher = "Elsevier",
journal = "Chemical Engineering Journal",
title = "Degradation of three typical hydroxamic acids collectors via UVA-B activated H2O2 and persulfate: Kinetics, transformation pathway, DFT calculation and toxicity evaluation",
volume = "451",
pages = "138639",
doi = "10.1016/j.cej.2022.138639"
}

Pang, W., Yao, J., Šolević Knudsen, T., Cao, Y., Liu, B., Li, H., Li, M.,& Zhu, J.. (2023). Degradation of three typical hydroxamic acids collectors via UVA-B activated H2O2 and persulfate: Kinetics, transformation pathway, DFT calculation and toxicity evaluation. in Chemical Engineering Journal
Elsevier., 451, 138639.
https://doi.org/10.1016/j.cej.2022.138639

Pang W, Yao J, Šolević Knudsen T, Cao Y, Liu B, Li H, Li M, Zhu J. Degradation of three typical hydroxamic acids collectors via UVA-B activated H2O2 and persulfate: Kinetics, transformation pathway, DFT calculation and toxicity evaluation. in Chemical Engineering Journal. 2023;451:138639.
doi:10.1016/j.cej.2022.138639 .

Pang, Wancheng, Yao, Jun, Šolević Knudsen, Tatjana, Cao, Ying, Liu, Bang, Li, Hao, Li, Miaomiao, Zhu, Junjie, "Degradation of three typical hydroxamic acids collectors via UVA-B activated H2O2 and persulfate: Kinetics, transformation pathway, DFT calculation and toxicity evaluation" in Chemical Engineering Journal, 451 (2023):138639,
https://doi.org/10.1016/j.cej.2022.138639 . .