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Arsenite oxidation and removal driven by a bio-electro-Fenton process under neutral pH conditions

文献类型： 外文期刊

作者： Wang, Xiang-Qin 1 ; Liu, Chuan-Ping 1 ; Yuan, Yong 1 ; Li, Fang-bai 1 ;

作者机构： 1.Guangdong Inst Ecoenvironm & Soil Sci, Guangdong Key Lab Agr Environm Pollut Integrated, Guangzhou 510650, Guangdong, Peoples R China

关键词： Microbial fuel cell;Bio-electro-Fenton process;γ-FeOOH;Arsenic;Oxidation

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 2020影响因子：10.588； 五年影响因子：10.129 ）

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收录情况： SCI

摘要： The iron-catalyzed oxidation of arsenite (As(Ⅲ)) associated with Fenton or Fenton-like reactions is one of the most efficient arsenic removal methods. However, the conventional chemical or electro-Fenton systems for the oxidation of As(Ⅲ) are only efficient under acid conditions. In the present study, a cost-effective and efficient bio-electro-Fenton process was performed for As(Ⅲ) oxidation in a dual-chamber microbial fuel cell (MFC) under neutral pH conditions. In such a system, the Fenton reagents, including H_2O_2 and Fe(Ⅱ), were generated in situ by microbial-driven electro-reduction of O_2 and γ-FeOOH, respectively, without an electricity supply. The results indicated that the process was capable of inducing As(Ⅲ) oxidation with an apparent As(Ⅲ) depletion first-order rate constant of 0.208 h~(-1). The apparent oxidation current efficiency was calculated to be as high as 73.1%. The γ-FeOOH dosage in the cathode was an important factor in determining the system performance. Fourier-transform infrared spectroscopy (FT-IR) analysis indicated that As(Ⅴ) was bound to the solid surface as a surface complex but not as a precipitated solid phase. The mechanism of bio-E-Fenton reaction for As(Ⅲ) oxidation was also proposed. The bio-electro-Fenton system makes it potentially attractive method for the detoxification of As(Ⅲ) from aqueous solution.

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