利用 Fe(II)-EDTA 催化过硫酸盐在微生物燃料电池中对偶氮染料橙 G 的脱色。
Decolorization of an azo dye Orange G in microbial fuel cells using Fe(II)-EDTA catalyzed persulfate.
机构信息
College of Environmental Science and Engineering, Hunan University, Changsha 410082, PR China.
出版信息
Bioresour Technol. 2012 Dec;126:101-6. doi: 10.1016/j.biortech.2012.09.001. Epub 2012 Sep 8.
This study constructed a microbial fuel cell (MFC) using Fe(II)-EDTA catalyzed persulfate as the cathode solutions to decolorize Orange G (OG) and harvest electricity simultaneously. Chelated Fe(2+) could activate persulfate to generate sulfate free radicals (SO(4)(-)) which with high oxidation potential (E(0)=2.6 V) can degrade azo dyes. The influence of some important factors such as pH value of cathode solutions, dosages of K(2)S(2)O(8), Fe(2+) and EDTA were investigated in a two-chamber microbial fuel cell. Under an optimal condition, the maximum power density achieved 91.1 mW m(-2), the OG removal rate was 97.4% and the K(2)S(2)O(8) remaining rate was 47.3% after 12 h. The OG degradation by Fe(II)-EDTA catalyzed persulfate was found to follow the second-order kinetic model.
本研究构建了一种微生物燃料电池（MFC），使用 Fe(II)-EDTA 催化过硫酸盐作为阴极溶液，同时实现了橙 G（OG）的脱色和电能的回收。螯合的 Fe(2+)可以激活过硫酸盐，生成具有高氧化电位（E(0)=2.6 V）的硫酸根自由基（SO(4)(-))，可以降解偶氮染料。在双室微生物燃料电池中考察了一些重要因素，如阴极溶液的 pH 值、K(2)S(2)O(8)、Fe(2+)和 EDTA 的用量。在最佳条件下，最大功率密度达到 91.1 mW m(-2)，12 h 后 OG 的去除率为 97.4%，K(2)S(2)O(8)的剩余率为 47.3%。Fe(II)-EDTA 催化过硫酸盐降解 OG 遵循二级动力学模型。
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