Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, Guangzhou, China.
Bioresour Technol. 2011 Feb;102(3):2468-73. doi: 10.1016/j.biortech.2010.11.013. Epub 2010 Nov 12.
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 H(2)O(2) at the cathode driven by iron-reducing bacteria. At pH 2.0, only 42.5% of Cr(VI) was reduced after 12h in the nitrogen-bubbling-cathode MFC, while complete reduction of Cr(VI) was achieved in 4h in the air-bubbling-cathode MFC in which the reduction of oxygen to H(2)O(2) 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.
六价铬（Cr(VI)）在空气阴极双室微生物燃料电池（MFC）中的碳纤维毡阴极原位还原。证明 Cr(VI)的还原与铁还原菌驱动的阴极生成的电生 H(2)O(2)密切相关。在 pH 2.0 条件下，氮气鼓泡阴极 MFC 中 12 小时后仅还原了 42.5%的 Cr(VI)，而在空气鼓泡阴极 MFC 中 4 小时内完成了 Cr(VI)的完全还原，其中确认了氧气还原为 H(2)O(2)。实验评估了影响 Cr(VI)还原效率的条件，包括阴极电解液 pH、铁还原物种类型和氧化还原介体的添加。结果表明，采用空气鼓泡阴极 MFC 可以实现 Cr(VI)的有效还原。
