Electrochemical degradation of DCF by boron-doped diamond anode: degradation mechanism, pathways and influencing factors

Nonsteroidal anti-inflammatory drugs (NSAIDs) have been widely detected in wastewater and surface water, indicating that the removal of NSAIDs by wastewater treatment plants was not efficient. Electrochemical advanced oxidation technology is considered to be an effective process. This study presents...

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Autores principales:	Huimin Qiu, Pingping Fan, Xueying Li, Guangli Hou
Formato:	article
Lenguaje:	EN
Publicado:	IWA Publishing 2021
Materias:	boron-doped diamond (bdd) dcf degradation pathways electrochemical oxidation water quality parameters Environmental technology. Sanitary engineering TD1-1066
Acceso en línea:	https://doaj.org/article/9e865e9c9c4a4647b2843a7d81032ee6
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spelling	oai:doaj.org-article:9e865e9c9c4a4647b2843a7d81032ee62021-11-06T11:13:56ZElectrochemical degradation of DCF by boron-doped diamond anode: degradation mechanism, pathways and influencing factors0273-12231996-973210.2166/wst.2021.231https://doaj.org/article/9e865e9c9c4a4647b2843a7d81032ee62021-07-01T00:00:00Zhttp://wst.iwaponline.com/content/84/2/431https://doaj.org/toc/0273-1223https://doaj.org/toc/1996-9732Nonsteroidal anti-inflammatory drugs (NSAIDs) have been widely detected in wastewater and surface water, indicating that the removal of NSAIDs by wastewater treatment plants was not efficient. Electrochemical advanced oxidation technology is considered to be an effective process. This study presents an investigation of the kinetics, mechanism, and influencing factors of diclofenac (DCF) degradation by an electrochemical process with boron-doped diamond anodes. Relative operating parameters and water quality parameters are examined. It appears that the degradation follows the pseudo-first-order degradation kinetics. DCF degradation was accelerated with the increase of pH from 6 to 10. The degradation was promoted by the addition of electrolyte concentrations and current density. Humic acid and bicarbonate significantly inhibited the degradation, whereas chloride accelerated it. According to the quenching tests, hydroxyl radicals (•OH) and sulfate radicals contributed 76.5% and 6.5%, respectively, to the degradation. Sodium sulfate remains a more effective electrolyte, compared to sodium nitrate and sodium phosphate, suggesting the quenching effect of nitrate and phosphate on •OH. Major DCF transformation products were identified. According to the degradation products detected by liquid chromatography–mass spectrometry, hydroxylation and decarboxylation are the main pathways of DCF degradation; while dechlorination, chlorination, and nitro substitution are also included in this electrochemical degradation process. Highlights The electrochemical degradation of DCF at BDD anodes follows pseudo-first-order kinetics.; •OH contributes more than SO4•–, but the effect of SO4•– cannot be ignored.; The presence of Cl− significantly accelerated the degradation of DCF.; Hydroxylation and decarboxylation are main pathways in DCF degradation.;Huimin QiuPingping FanXueying LiGuangli HouIWA Publishingarticleboron-doped diamond (bdd)dcfdegradation pathwayselectrochemical oxidationwater quality parametersEnvironmental technology. Sanitary engineeringTD1-1066ENWater Science and Technology, Vol 84, Iss 2, Pp 431-444 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	boron-doped diamond (bdd) dcf degradation pathways electrochemical oxidation water quality parameters Environmental technology. Sanitary engineering TD1-1066
spellingShingle	boron-doped diamond (bdd) dcf degradation pathways electrochemical oxidation water quality parameters Environmental technology. Sanitary engineering TD1-1066 Huimin Qiu Pingping Fan Xueying Li Guangli Hou Electrochemical degradation of DCF by boron-doped diamond anode: degradation mechanism, pathways and influencing factors
description	Nonsteroidal anti-inflammatory drugs (NSAIDs) have been widely detected in wastewater and surface water, indicating that the removal of NSAIDs by wastewater treatment plants was not efficient. Electrochemical advanced oxidation technology is considered to be an effective process. This study presents an investigation of the kinetics, mechanism, and influencing factors of diclofenac (DCF) degradation by an electrochemical process with boron-doped diamond anodes. Relative operating parameters and water quality parameters are examined. It appears that the degradation follows the pseudo-first-order degradation kinetics. DCF degradation was accelerated with the increase of pH from 6 to 10. The degradation was promoted by the addition of electrolyte concentrations and current density. Humic acid and bicarbonate significantly inhibited the degradation, whereas chloride accelerated it. According to the quenching tests, hydroxyl radicals (•OH) and sulfate radicals contributed 76.5% and 6.5%, respectively, to the degradation. Sodium sulfate remains a more effective electrolyte, compared to sodium nitrate and sodium phosphate, suggesting the quenching effect of nitrate and phosphate on •OH. Major DCF transformation products were identified. According to the degradation products detected by liquid chromatography–mass spectrometry, hydroxylation and decarboxylation are the main pathways of DCF degradation; while dechlorination, chlorination, and nitro substitution are also included in this electrochemical degradation process. Highlights The electrochemical degradation of DCF at BDD anodes follows pseudo-first-order kinetics.; •OH contributes more than SO4•–, but the effect of SO4•– cannot be ignored.; The presence of Cl− significantly accelerated the degradation of DCF.; Hydroxylation and decarboxylation are main pathways in DCF degradation.;
format	article
author	Huimin Qiu Pingping Fan Xueying Li Guangli Hou
author_facet	Huimin Qiu Pingping Fan Xueying Li Guangli Hou
author_sort	Huimin Qiu
title	Electrochemical degradation of DCF by boron-doped diamond anode: degradation mechanism, pathways and influencing factors
title_short	Electrochemical degradation of DCF by boron-doped diamond anode: degradation mechanism, pathways and influencing factors
title_full	Electrochemical degradation of DCF by boron-doped diamond anode: degradation mechanism, pathways and influencing factors
title_fullStr	Electrochemical degradation of DCF by boron-doped diamond anode: degradation mechanism, pathways and influencing factors
title_full_unstemmed	Electrochemical degradation of DCF by boron-doped diamond anode: degradation mechanism, pathways and influencing factors
title_sort	electrochemical degradation of dcf by boron-doped diamond anode: degradation mechanism, pathways and influencing factors
publisher	IWA Publishing
publishDate	2021
url	https://doaj.org/article/9e865e9c9c4a4647b2843a7d81032ee6
work_keys_str_mv	AT huiminqiu electrochemicaldegradationofdcfbyborondopeddiamondanodedegradationmechanismpathwaysandinfluencingfactors AT pingpingfan electrochemicaldegradationofdcfbyborondopeddiamondanodedegradationmechanismpathwaysandinfluencingfactors AT xueyingli electrochemicaldegradationofdcfbyborondopeddiamondanodedegradationmechanismpathwaysandinfluencingfactors AT guanglihou electrochemicaldegradationofdcfbyborondopeddiamondanodedegradationmechanismpathwaysandinfluencingfactors
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Electrochemical degradation of DCF by boron-doped diamond anode: degradation mechanism, pathways and influencing factors

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