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Insights into the electrochemical degradation of sulfamethoxazole and its metabolite by Ti/SnO_(2)-Sb/Er-PbO_(2) anode

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Chinese Chemical Letters 2020年第10期31卷 2673-2677页

作者： Yanping Wang Chengzhi Zhou Jinhua Wu Junfeng Niu School of Environment and Energy South China University of TechnologyGuangzhou 510006China Research Center for Eco-Environmental Engineering Dongguan University of TechnologyDongguan 523808China

Electrochemical degradation of sulfamethoxazole(SMX)and its metabolite acetyl-sulfamethoxazole(AcSMX)by Ti/SnO_(2)-Sb/Er-PbO_(2) were *** indicated that the electrochemical degradation of SMX and Ac-SMX followed pseudo-first-order *** rate constants of SMX and Ac-SMX were 0.268 and 0.072 min-1 at optimal curre nt density of 10 and 14 mA/cm^(2),*** products of SMX and Ac-SMX were identified and the possible degradation pathways,including the cleavage of S-N bond,opening ring of isoxazole and nitration of amino group,were *** organic carbon removal of SMX was nearly 63.2%after 3 h electrochemical degradation.22.4%nitrogen of SMX was trans formed to NO_(3)-,and 98.8%sulfur of SMX was released as SO_(4)2-.According to quantitative structureactivity relationship model,toxicities of SMX and Ac-SMX to aquatic organisms significantly decreased after electrochemical *** energy consumption for 90%SMX and Ac-SMX degradation was determined to be 0.58-8.97 and 6.88-44.19 Wh/L at different experimental conditions,*** with parent compound SMX,the metabolite Ac-SMX is more refractory and toxic,which emphasizes the importance of taking its metabolites into account when investigating the disposal of pharmaceuticals from wastewater.

关键词： Electrochemical degradation sulfamethoxazole and metabolite Degradation mechanism Quantitative structure-activity relationship

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