Microbial fuel cells using natural pyrrhotite as the cathodic heterogeneous Fenton catalyst towards the degradation of biorefractory organics in landfill leachate
Microbial fuel cells using natural pyrrhotite as the cathodic heterogeneous Fenton catalyst towards the degradation of biorefractory organics in landfill leachate
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DOI：
10.1016/j.elecom.2010.04.027
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发表时间：
2010-07
影响因子：
5.4
通讯作者：
Yan Li;Anhuai Lu;Hongrui Ding;Xin Wang;Changqiu Wang;Cuiping Zeng;Yun Yan
中科院分区：
文献类型：
--
作者：
Yan Li;Anhuai Lu;Hongrui Ding;Xin Wang;Changqiu Wang;Cuiping Zeng;Yun Yan
研究了阴极磁黄铁矿芬顿反应与阳极微生物呼吸反应相结合的MFC强化性能及对真实的垃圾渗滤液的处理效果。磁黄铁矿包覆石墨阴极的MFC最大功率密度为4.2W/m3，比石墨阴极提高了133%。电化学阻抗谱（EIS）测试结果表明，磁黄铁矿阴极的极化电阻（92Ω）远低于石墨阴极（1057Ω），表明磁黄铁矿的阴极过电位明显降低，可能是磁黄铁矿芬顿反应的发生。磁黄铁矿阴极上原位生成的芬顿试剂（Fe ~（2+）和H_2 O_2）可通过循环伏安法测量。此外，磁黄铁矿的芬顿反应产生的活性氧物种的检测和证明是至关重要的MFC功率输出的提高。此外，该系统的有效性进行了检查，通过处理一个老年龄的垃圾渗滤液。结果表明，磁黄铁矿不仅可以作为一种经济高效的阴极催化剂用于MFC发电，而且可以将传统MFC的实用优势扩展到生物难降解污染物的高级氧化方面。
An investigation aimed at checking the integration of cathodic pyrrhotite Fenton's reaction with anodic microbial respiration for the enhancement of MFC performance and treatment of a real landfill leachate was carried out. The MFC equipped with a pyrrhotite-coated graphite-cathode generated the maximum power density of 4.2W/m3that was 133% higher than graphite-cathode. Concomitantly, electrochemical impedance spectroscopy (EIS) showed that the polarization resistance of pyrrhotite-cathode (92Ω) was much lower than the graphite-cathode (1057Ω), indicating that the cathodic overpotential was significantly lowered, probably due to the occurrence of pyrrhotite Fenton's reaction. The in situ generation of Fenton's reagents (Fe2+and H2O2) at the pyrrhotite-cathode was demonstrated by the cyclic voltammetry measurement. Besides, reactive oxygen species produced from the pyrrhotite Fenton's reaction were detected and demonstrated to be vital to the enhancement of MFC power output. Further, the effectiveness of this system was examined by treating an old-aged landfill leachate. 77% of color and 78% of COD were removed from the original leachate, indicating that the pyrrhotite not only acted as a cost-effective cathodic catalyst for MFCs in power generation, but also extended the practical merits of traditional MFCs towards advanced oxidation of biorefractory pollutants.