阳极改性的SMFC对恩诺沙星的降解性能和同步产电研究

Degradation Performance and Electro-Generation of Enrofloxacin by SMFC with Anode Modified

本研究构建沉积物微生物燃料电池(Sediment microbial fuel cell, SMFC),采用原位化学聚合法制备了3种改性阳极碳毡(Carbon felt, CF):聚苯胺(Polyaniline, PANI)/CF、MnO/CF和PANI-MnO/CF。对比分析了不同改性阳极对SMFC系统产电性能的影响,探讨了SMFC系统对海水养殖区沉积物中特定污染物恩诺沙星的降解效果和同步产电能力。结果表明:PANI-MnO复合材料修饰的阳极比表面积最大,构建的SMFC系统产电能力最佳,最大输出电压为602 mV,最大功率密度为165.09 mW·m。低浓度(12.81 ng·g)恩诺沙星的存在对SMFC系统的产电性能有促进作用,最大电压达到633 mV,最大功率密度为175 mW·m。SMFC系统对沉积物中恩诺沙星有显著降解效果,去除率达到59.52%,是自然条件下降解的3.05倍;在系统运行过程中有少量恩诺沙星向上覆海水中迁移,在第5天到第25天内迁移浓度从0.019 ng·mL减少到0.005 ng·mL,降幅为72.73%。通过生物毒性分析发现,SMFC系统运行结束后海水未检测出毒性,沉积物中的毒性也大大降低。本研究可为海水养殖区沉积物中抗生素的降解提供参考。

In this study, an approach of sediment microbial fuel cell(Sediment microbial fuel cell, SMFC) was constructed, three modified anode carbon felt(Carbon felt, CF) were synthesized by in-situ polymerization: polyaniline(PANI)/CF, MnO/CF and PANI-MnO/CF;analyzed the power generation capacity of different anodes;investigated the removal effect of the SMFC system on the specific pollutant enrofloxacin in the sediment of mariculture areas and its power generation capacity simultaneously. The results showed that, the SMFC with PANI-MnOanode provided larger surface areas and obtained the maximum output voltage and maximum power density, which were 602 mV and 165.09 mW·m, respectively. The low concentration(12.81 ng·g) of enrofloxacin promoted the electricity production performance of the SMFC system. The maximum voltage reached 633 mV and the maximum power density was 175 mW·m. The SMFC system had a significant effect on enrofloxacin in sediments, with a removal rate of 59.52%, which is 3.05 times as much as that of the degradation under natural conditions;during the operation of the system, a small amount of enrofloxacin migrated to the overlying seawater, the migration concentration decreased from 0.019 to 0.005 ng·mL, with the decline of 72.73%. Through biological toxicity analysis, it was found that no toxicity was detected in seawater after the operation of the SMFC system, and the toxicity of sediments was also greatly reduced. This study provided an academic reference for the degradation of antibiotics in the sediments of mariculture areas.