共 48 条
Bioanodes/biocathodes formed at optimal potentials enhance subsequent pentachlorophenol degradation and power generation from microbial fuel cells
被引:51
作者:
Huang, Liping
[1
]
Wang, Qiang
[1
]
Quan, Xie
[1
]
Liu, Yaxuan
[1
]
Chen, Guohua
[2
]
机构:
[1] Dalian Univ Technol, Sch Environm Sci & Technol, Minist Educ MOE, Key Lab Ind Ecol & Environm Engn, Dalian 116024, Peoples R China
[2] Hong Kong Univ Sci & Technol, Dept Chem & Biomol Engn, Kowloon, Hong Kong, Peoples R China
关键词:
Pentachlorophenol;
Microbial fuel cell;
Bioanode;
Biocathode;
Bioelectrochemical cell;
HEXAVALENT CHROMIUM REDUCTION;
SET ANODE POTENTIALS;
GEOBACTER-SULFURREDUCENS;
SP-NOV;
BIOCATHODE;
BIODEGRADATION;
MINERALIZATION;
DECHLORINATION;
COMMUNITIES;
PERFORMANCE;
D O I:
10.1016/j.bioelechem.2013.05.001
中图分类号:
Q5 [生物化学];
Q7 [分子生物学];
学科分类号:
071010 ;
081704 ;
摘要:
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 (243 +/- 2.2 mu M 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 my, 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. (C) 2013 Elsevier B.V. All rights reserved.
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页码:13 / 22
页数:10
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