微生物燃料电池对磺胺间甲氧嘧啶的降解研究

Effects of microbial fuel cells on sulfamonomethoxine degradation

为探究微生物燃料电池(Microbial fuel cells,MFCs)对抗生素磺胺间甲氧嘧啶(Sulfamonomethoxine,SMM)的降解效果及MFCs的产电性能,通过构建单室MFCs,比较不同电极材料、菌种种类、抗生素初始浓度以及腐植酸存在条件下MFCs对SMM的降解效果及其产电性能。结果表明:3种阳极材料下MFCs对SMM的降解率及产电性能的高低为碳毡>碳纸>石墨棒;在SMM初始浓度为10 mg·L^-1的条件下,以Shewanella putrefaciens为菌种的MFCs对SMM的降解率达到58.92%,高于Shewanella oneidensis MR-1的降解率46.48%,MFCs的最大输出功率前者比后者约高6.51 mW·m^-2;随着抗生素初始浓度的增加,SMM的降解效果逐渐减弱,MFCs的电压输出逐渐降低;随着腐植酸浓度增加,SMM的降解率逐渐提高,MFCs的产电性能逐渐增强。研究表明,MFCs可以利用SMM作为燃料,在实现降解的同时输出电能,这为水体环境中磺胺类抗生素的高效低耗处理提供了科学依据。

Microbial fuel cells(MFCs)can exploit the metabolic activities of microorganisms to yield electricity from substrate oxidation;thus,they have attracted a huge amount of interest in areas from fundamental theory to environmental remediation.It is well documented that many factors impact the electrical performance of MFCs and its application in contaminant degradation,including electrode materials,microbial source,contaminant concentration,and humic acid.In this study,the potential utilization of MFCs for the degradation of sulfa⁃monomethoxine(SMM)was investigated,along with electrical output.The results showed that for three anode materials tested,the degrada⁃tion rate of SMM and the electrical performance of MFCs were in the following order:carbon felt>carbon paper>graphite rod.At the initial SMM concentration of 10 mg·L^-1,the degradation rate of SMM by Shewanella putrefaciens in MFCs reached 58.92%,higher than 46.48%by Shewanella oneidensis MR-1,and the maximum output power of MFCs from S.putrefaciens was approximately 6.51 mW·m^-2 higher than that from S.oneidensis MR-1.As the SMM concentration increased,the output voltage of MFCs and the SMM degradation rate decreased.With an increase in humic acid,the degradation efficiency of SMM and the electrical performance of MFCs were enhanced.The anode per⁃formance of MFCs affected the degradation of SMM.In conclusion,MFCs could degrade SMM as fuel to output electrical energy,thereby providing a method for the realization of efficient and low-consumption treatment of sulfonamide antibiotics in the environment.