Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 3, Pages 2468-2473Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.11.013
Keywords
Cr(VI) reduction; Electrogenerated hydrogen peroxide; Iron-reducing bacteria; Microbial fuel cell
Funding
- National Science Foundation of China [40771105]
- Guangdong Innovative Technique Foundation [2006A36703003, 2007B080401019, 2008A080401008]
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Cr(VI) was reduced in-situ at a carbon felt cathode in an air-cathode dual-chamber microbial fuel cell (MFC). The reduction of Cr(VI) was proven to be strongly associated with the electrogenerated H2O2 at the cathode driven by iron-reducing bacteria. At pH 2.0, only 42.5% of Cr(VI) was reduced after 12 h in the nitrogen-bubbling-cathode MFC, while complete reduction of Cr(VI) was achieved in 4 h in the air-bubbling-cathode MFC in which the reduction of oxygen to H2O2 was confirmed. Conditions that affected the efficiency of the reduction of Cr(VI) were evaluated experimentally, including the cathodic electrolyte pH, the type of iron-reducing species, and the addition of redox mediators. The results showed that the efficient reduction of Cr(VI) could be achieved with an air-bubbling-cathode MFC. (C) 2010 Elsevier Ltd. All rights reserved.
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