Bioanodes/biocathodes formed at optimal potentials enhance subsequent pentachlorophenol degradation and power generation from microbial fuel cells

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• 作者：Liping Huang ; Qiang Wang ; Xie Quan ; Yaxuan Liu ; Guohua Chen
• 关键词：Pentachlorophenol ; Microbial fuel cell ; Bioanode ; Biocathode ; Bioelectrochemical cell
• 刊名：Bioelectrochemistry
• 出版年：2013
• 出版时间：December, 2013
• 年：2013
• 卷：94
• 期：Complete
• 页码：13-22
• 全文大小：2094 K

文摘

Bioanodes formed at an optimal potential of 200 mV vs. SHE and biocathodes developed at ? 300 mV vs. SHE in bioelectrochemical cells (BECs) enhanced the subsequent performances of microbial fuel cells (MFCs) compared to the un-treated controls. While the startup times were reduced to 320 h (bioanodes) and 420-440 h (biocathodes), PCP degradation rates were improved by 28.5 % (bioanodes) and 21.5 % (biocathodes), and power production by 41.7 % (bioanodes) and 44 % (biocathodes). Accordingly, there were less accumulated products of PCP de-chlorination in the biocathodes whereas PCP in the bioanodes was more efficiently de-chlorinated, resulting in the formation of a new product of 3,4,5-trichlorophenol (24.3 ¡À 2.2 ¦ÌM at 96 h). Charges were diverted to more generation of electricity in the bioanodes at 200 mV while oxygen in the biocathodes at ? 300 mV acted as a primary electron acceptor. Dominant bacteria known as recalcitrant organic degraders and/or exoelectrogens/electrotrophs included Desulfovibrio carbinoliphilus and Dechlorospirillum sp. on the bioanodes at 200 mV, and Desulfovibrio marrakechensis, Comamonas testosteroni and Comamonas sp. on the biocathodes at ? 300 mV. These results demonstrated that an optimal potential was a feasible approach for developing both bioanodes and biocathodes for efficient PCP degradation and power generation from MFCs.