• 关键词：磺胺喹噁啉（SQX）  微生物燃料电池（MFCs）  产电性能  生物毒性  微生物群落

• 基金项目：国家重点研发计划项目（No. 2019YFC0408601 ）； 国家自然科学基金青年基金（No.21707099）

• 郭佩茹
• 太原理工大学环境科学与工程学院，太原 030024

• 汪素芳
• 太原理工大学环境科学与工程学院，太原 030024

• 郑杰蓉
• 太原理工大学环境科学与工程学院，太原 030024

• 王翠翠
• 太原理工大学环境科学与工程学院，太原 030024

• 龚勍
• 太原理工大学环境科学与工程学院，太原 030024

• 周爱娟
• 太原理工大学环境科学与工程学院，太原 030024

• 岳秀萍
• 太原理工大学环境科学与工程学院，太原 030024

• 段润斌
• 太原理工大学环境科学与工程学院，太原 030024

• 摘要：磺胺喹噁啉（Sulfaquinoxaline，SQX）作为一种磺胺类抗生素，广泛用于禽畜球虫病防治，易在环境中残留从而造成环境污染，对其降解研究较少.本研究通过微生物燃料电池（Microbial fuel cells，MFCs），以10 mg·L^-1 SQX和乙酸钠为底物研究SQX降解特性、电化学性能、产物生物毒性及菌群结构.结果表明，SQX降解率随着乙酸钠浓度的升高先增大后减小，其中SQX与TOC在10 d内最大降解率分别为87.1%和94.0%；MFC体系的最大功率密度和输出电压分别为309.8 mW·m^-2和0.702 V；大肠杆菌和青海弧菌Q67毒性实验结果表明，SQX经MFC处理后可有效降低生物毒性；通过LC-TOF/MS分析，SQX生物降解过程中的主要中间产物，推测出羟基化反应、磺酰胺键断裂、吡嗪环C-N键断裂、水解反应、分子重排等降解路径；微生物群落分析表明，MFC阳极体系中Terrimonas、Aquamicrobium、Thiobacillus等菌属与SQX生物降解相关.

• Abstract：Although Sulfaquinoxaline （SQX） as a sulfonamide antibiotic has been widely used to effectively prevent and treat coccidiosis in livestock in the world， the residual SQX readily remains in the environment resulting in severe pollution and the research on SQX degradation is relatively limited. The objective of this study was to investigate the degradation performance of SQX in MFC， electrochemical behavior， the toxicity of degrdation byproducts， and microbial community structure of bioanode. The results showed that the degradation rate of SQX initially increased and then decreased with the increase of the sodium acetate concentration， and the maximum degradation rates of SQX and TOC in ten days were 87.1% and 94.0%， respectively. The maximum power density and output voltage of MFCs in the system were 309.8 mW·m^-2 and 0.702 V， respectively. The toxicity test results of Escherichia coli and Vibtzoqinghaiensis Q67 indicated that the biological toxicity of SQX could be effectively reduced after MFCs treatment. The analysis of main intermediates in the process of SQX biodegradation using LC-TOF/MS found that the degradation pathways possibly include hydroxylation ， sulfonamide bond breaking， pyrazine ring C-N bond breaking， hydrolysis and molecular rearrangement. Microbial community analysis results showed that Terrimonas， Aquamicrobium， Thiobacillus， and other unknown bacteria in the anode system of MFCs participated in the degradation of SQX.

• Key words：Sulfaquinoxaline（SQX）  Microbial fuel cells （MFCs）  electricity generation performance  biological toxicity  microbial community structure

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