Degradation of sulfamethoxazole by MnO2/heat-activated persulfate: Kinetics, synergistic effect and reaction mechanism

Contaminants destruction via advanced oxidation processes using catalyst and heat for peroxydisulfate (PDS) activation have been proven to be a feasible method in environmental remediation. Nevertheless, the synergistic activation of PDS by Mn-based catalysts and heat was barely reported in early in...

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Autores principales:	Ting Zhou, Jiangkun Du, Zhijie Wang, Guangfeng Xiao, Liting Luo, Muhammad Faheem, Haibo Ling, Jianguo Bao
Formato:	article
Lenguaje:	EN
Publicado:	Elsevier 2022
Materias:	Sulfamethoxazole Persulfate Heat/MnO2 Synergistic effect Sulfate radicals Reaction mechanism Chemical engineering TP155-156
Acceso en línea:	https://doaj.org/article/9796c0c161cf4f84a777a29fdadac15d
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spelling	oai:doaj.org-article:9796c0c161cf4f84a777a29fdadac15d2021-11-16T04:11:34ZDegradation of sulfamethoxazole by MnO2/heat-activated persulfate: Kinetics, synergistic effect and reaction mechanism2666-821110.1016/j.ceja.2021.100200https://doaj.org/article/9796c0c161cf4f84a777a29fdadac15d2022-03-01T00:00:00Zhttp://www.sciencedirect.com/science/article/pii/S2666821121001150https://doaj.org/toc/2666-8211Contaminants destruction via advanced oxidation processes using catalyst and heat for peroxydisulfate (PDS) activation have been proven to be a feasible method in environmental remediation. Nevertheless, the synergistic activation of PDS by Mn-based catalysts and heat was barely reported in early investigations. In this study, we focused on a systematic investigation of PDS activation over manganese dioxide (MnO2) under the assistance of heat for sulfamethoxazole (SMX) degradation. Effects of some key reaction parameters such as PDS concentration, MnO2 dosage, initial pH and temperature were evaluated. The MnO2/heat/PDS synergistic system presented high performance on SMX degradation compared to the MnO2/PDS and heat/PDS systems. The degree of synergistic effect between MnO2 and heat in the MnO2/heat/PDS system was calculated and it was 88.62%. Both SO4•− and •OH rather than 1O2 were detected to be responsible for SMX oxidation. Based on identified oxidation products by the liquid chromatography-quadrupole/time-of-flight mass spectrometry, the transformation pathways of SMX in MnO2/heat/PDS system followed mainly four major pathways (a) cleavage of S-N bond; (b) hydroxylation for benzene ring; and (c) dehydrogenation of the amino group. Moreover, MnO2 could keep its excellent catalytic performance even after four consecutive oxidation cycles. Therefore, this paper advances the understanding of the synergy of MnO2 with heat for enhanced PDS activation.Ting ZhouJiangkun DuZhijie WangGuangfeng XiaoLiting LuoMuhammad FaheemHaibo LingJianguo BaoElsevierarticleSulfamethoxazolePersulfateHeat/MnO2Synergistic effectSulfate radicalsReaction mechanismChemical engineeringTP155-156ENChemical Engineering Journal Advances, Vol 9, Iss , Pp 100200- (2022)
institution	DOAJ
collection	DOAJ
language	EN
topic	Sulfamethoxazole Persulfate Heat/MnO2 Synergistic effect Sulfate radicals Reaction mechanism Chemical engineering TP155-156
spellingShingle	Sulfamethoxazole Persulfate Heat/MnO2 Synergistic effect Sulfate radicals Reaction mechanism Chemical engineering TP155-156 Ting Zhou Jiangkun Du Zhijie Wang Guangfeng Xiao Liting Luo Muhammad Faheem Haibo Ling Jianguo Bao Degradation of sulfamethoxazole by MnO2/heat-activated persulfate: Kinetics, synergistic effect and reaction mechanism
description	Contaminants destruction via advanced oxidation processes using catalyst and heat for peroxydisulfate (PDS) activation have been proven to be a feasible method in environmental remediation. Nevertheless, the synergistic activation of PDS by Mn-based catalysts and heat was barely reported in early investigations. In this study, we focused on a systematic investigation of PDS activation over manganese dioxide (MnO2) under the assistance of heat for sulfamethoxazole (SMX) degradation. Effects of some key reaction parameters such as PDS concentration, MnO2 dosage, initial pH and temperature were evaluated. The MnO2/heat/PDS synergistic system presented high performance on SMX degradation compared to the MnO2/PDS and heat/PDS systems. The degree of synergistic effect between MnO2 and heat in the MnO2/heat/PDS system was calculated and it was 88.62%. Both SO4•− and •OH rather than 1O2 were detected to be responsible for SMX oxidation. Based on identified oxidation products by the liquid chromatography-quadrupole/time-of-flight mass spectrometry, the transformation pathways of SMX in MnO2/heat/PDS system followed mainly four major pathways (a) cleavage of S-N bond; (b) hydroxylation for benzene ring; and (c) dehydrogenation of the amino group. Moreover, MnO2 could keep its excellent catalytic performance even after four consecutive oxidation cycles. Therefore, this paper advances the understanding of the synergy of MnO2 with heat for enhanced PDS activation.
format	article
author	Ting Zhou Jiangkun Du Zhijie Wang Guangfeng Xiao Liting Luo Muhammad Faheem Haibo Ling Jianguo Bao
author_facet	Ting Zhou Jiangkun Du Zhijie Wang Guangfeng Xiao Liting Luo Muhammad Faheem Haibo Ling Jianguo Bao
author_sort	Ting Zhou
title	Degradation of sulfamethoxazole by MnO2/heat-activated persulfate: Kinetics, synergistic effect and reaction mechanism
title_short	Degradation of sulfamethoxazole by MnO2/heat-activated persulfate: Kinetics, synergistic effect and reaction mechanism
title_full	Degradation of sulfamethoxazole by MnO2/heat-activated persulfate: Kinetics, synergistic effect and reaction mechanism
title_fullStr	Degradation of sulfamethoxazole by MnO2/heat-activated persulfate: Kinetics, synergistic effect and reaction mechanism
title_full_unstemmed	Degradation of sulfamethoxazole by MnO2/heat-activated persulfate: Kinetics, synergistic effect and reaction mechanism
title_sort	degradation of sulfamethoxazole by mno2/heat-activated persulfate: kinetics, synergistic effect and reaction mechanism
publisher	Elsevier
publishDate	2022
url	https://doaj.org/article/9796c0c161cf4f84a777a29fdadac15d
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Degradation of sulfamethoxazole by MnO2/heat-activated persulfate: Kinetics, synergistic effect and reaction mechanism

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