|
|||||
|
|
In-situ Cr(VI) reduction with electrogenerated hydrogen peroxide driven by iron-reducing bacteria |
|
| Authors: | Liu Liang Yuan Yong Li Fang-bai Feng Chun-hua |
| Affiliation: | a Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou 510650, China b Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China c School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China d Graduate University of Chinese Academy of Sciences, Beijing 100039, China |
| Abstract: | 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. |
| Keywords: | Cr(VI) reduction Electrogenerated hydrogen peroxide Iron-reducing bacteria Microbial fuel cell |
| 本文献已被 ScienceDirect PubMed 等数据库收录！ | |