期刊
ENVIRONMENTAL SCIENCE & TECHNOLOGY
卷 45, 期 11, 页码 5025-5031出版社
AMER CHEMICAL SOC
DOI: 10.1021/es103875d
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资金
- Natural Science Foundation of China [21077017]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT0813]
- Dalian University of Technology
- King Abdullah University of Science and Technology (KAUST) [KUS-I1-003-13]
Setting a biocathode potential at -300 mV improved the subsequent performance of an MFC for Cr(VI) reduction compared to a control (no set potential). With this set potential, the startup time was reduced to 19 days, the reduction of Cr(VI) was improved to 19.7 mg/L d, and the maximum power density was increased to 6.4 W/m(3) compared to the control (26 days, 14.0 mg/L d and 4.1 W/m(3)). Set potentials of -150 my and -300 mV also improved system performance and led to similarly higher utilization of metabolic energy gained (PMEG) than set potentials of +200 mV and -450 mV. We observed putative pili at -150 and -300 mV potentials, and aggregated precipitates on bacterial surfaces in both poised and nonpoised controls. These tests show that there are optimal potentials that can be set for developing a Cr(VI) biocathode,
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