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Sulfamethoxazole degradation by an Fe(ii)-activated persulfate process: insight into the reactive sites, product identification and degradation pathways.
Environ Sci Process Impacts. 2019 Sep 18; 21(9):1560-1569.ES

Abstract

In this study, the effects of key parameters on the degradation kinetics of sulfamethoxazole (SMX) in an Fe(ii)-activated persulfate (PS) process were elucidated. SMX could be completely degraded within 240 min at an initial pH of 3.3. It was found that 1 : 10 is the optimum molar ratio of Fe(ii) : PS. Typical water quality parameters, including solution pH, SMX concentration, inorganic ions and humic acid, are discussed for the degradation process. Although the SMX degradation kinetics varied for different water quality parameters, relatively high SMX removal could always be achieved. The Fe(ii)-activated persulfate process could maintain excellent SMX degradation under optimum reaction conditions. In addition, the reaction sites and intermediates of SMX were predicted by density functional theory (DFT) calculations and wave function analysis. The results of different calculations consistently indicate that N7 is the site with the highest electrophilic reactivity of SMX. The main intermediates formed were characterized through accurate mass measurement using UHPLC-HRMS/MS. Combined with the theoretical computations, the SMX degradation pathways in the Fe(ii)-activated persulfate process are proposed. This research could provide theoretical guidance for the degradation mechanism of sulfonamides and provide technical support for the design of efficient degradation reactions in the future.

Authors+Show Affiliations

School of Environment and Energy, South China University of Technology, Guangzhou 510006, China. ppjqwan@scut.edu.cn.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

31364657

Citation

Luo, Ting, et al. "Sulfamethoxazole Degradation By an Fe(ii)-activated Persulfate Process: Insight Into the Reactive Sites, Product Identification and Degradation Pathways." Environmental Science. Processes & Impacts, vol. 21, no. 9, 2019, pp. 1560-1569.
Luo T, Wan J, Ma Y, et al. Sulfamethoxazole degradation by an Fe(ii)-activated persulfate process: insight into the reactive sites, product identification and degradation pathways. Environ Sci Process Impacts. 2019;21(9):1560-1569.
Luo, T., Wan, J., Ma, Y., Wang, Y., & Wan, Y. (2019). Sulfamethoxazole degradation by an Fe(ii)-activated persulfate process: insight into the reactive sites, product identification and degradation pathways. Environmental Science. Processes & Impacts, 21(9), 1560-1569. https://doi.org/10.1039/c9em00254e
Luo T, et al. Sulfamethoxazole Degradation By an Fe(ii)-activated Persulfate Process: Insight Into the Reactive Sites, Product Identification and Degradation Pathways. Environ Sci Process Impacts. 2019 Sep 18;21(9):1560-1569. PubMed PMID: 31364657.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Sulfamethoxazole degradation by an Fe(ii)-activated persulfate process: insight into the reactive sites, product identification and degradation pathways. AU - Luo,Ting, AU - Wan,Jinquan, AU - Ma,Yongwen, AU - Wang,Yan, AU - Wan,YongJie, PY - 2019/8/1/pubmed PY - 2019/8/1/medline PY - 2019/8/1/entrez SP - 1560 EP - 1569 JF - Environmental science. Processes & impacts JO - Environ Sci Process Impacts VL - 21 IS - 9 N2 - In this study, the effects of key parameters on the degradation kinetics of sulfamethoxazole (SMX) in an Fe(ii)-activated persulfate (PS) process were elucidated. SMX could be completely degraded within 240 min at an initial pH of 3.3. It was found that 1 : 10 is the optimum molar ratio of Fe(ii) : PS. Typical water quality parameters, including solution pH, SMX concentration, inorganic ions and humic acid, are discussed for the degradation process. Although the SMX degradation kinetics varied for different water quality parameters, relatively high SMX removal could always be achieved. The Fe(ii)-activated persulfate process could maintain excellent SMX degradation under optimum reaction conditions. In addition, the reaction sites and intermediates of SMX were predicted by density functional theory (DFT) calculations and wave function analysis. The results of different calculations consistently indicate that N7 is the site with the highest electrophilic reactivity of SMX. The main intermediates formed were characterized through accurate mass measurement using UHPLC-HRMS/MS. Combined with the theoretical computations, the SMX degradation pathways in the Fe(ii)-activated persulfate process are proposed. This research could provide theoretical guidance for the degradation mechanism of sulfonamides and provide technical support for the design of efficient degradation reactions in the future. SN - 2050-7895 UR - https://www.unboundmedicine.com/medline/citation/31364657/Sulfamethoxazole_degradation_by_an_Fe_ii__activated_persulfate_process:_insight_into_the_reactive_sites_product_identification_and_degradation_pathways_ L2 - https://doi.org/10.1039/c9em00254e DB - PRIME DP - Unbound Medicine ER -