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Arsenite oxidation and removal driven by a bio-electro-Fenton process under neutral pH conditions.
J Hazard Mater. 2014 Jun 30; 275:200-9.JH

Abstract

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 H2O2 and Fe(II), were generated in situ by microbial-driven electro-reduction of O2 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.

Authors+Show Affiliations

Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, No. 808 Tianyuan Road, Tianhe Dis, Guangzhou 510650, PR China.Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, No. 808 Tianyuan Road, Tianhe Dis, Guangzhou 510650, PR China. Electronic address: cpliu@soil.gd.cn.Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, No. 808 Tianyuan Road, Tianhe Dis, Guangzhou 510650, PR China.Guangdong Key Laboratory of Agricultural Environment Pollution Integrated Control, Guangdong Institute of Eco-Environmental and Soil Sciences, No. 808 Tianyuan Road, Tianhe Dis, Guangzhou 510650, PR China. Electronic address: cefbli@soil.gd.cn.

Pub Type(s)

Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

24857903

Citation

Wang, Xiang-Qin, et al. "Arsenite Oxidation and Removal Driven By a bio-electro-Fenton Process Under Neutral pH Conditions." Journal of Hazardous Materials, vol. 275, 2014, pp. 200-9.
Wang XQ, Liu CP, Yuan Y, et al. Arsenite oxidation and removal driven by a bio-electro-Fenton process under neutral pH conditions. J Hazard Mater. 2014;275:200-9.
Wang, X. Q., Liu, C. P., Yuan, Y., & Li, F. B. (2014). Arsenite oxidation and removal driven by a bio-electro-Fenton process under neutral pH conditions. Journal of Hazardous Materials, 275, 200-9. https://doi.org/10.1016/j.jhazmat.2014.05.003
Wang XQ, et al. Arsenite Oxidation and Removal Driven By a bio-electro-Fenton Process Under Neutral pH Conditions. J Hazard Mater. 2014 Jun 30;275:200-9. PubMed PMID: 24857903.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Arsenite oxidation and removal driven by a bio-electro-Fenton process under neutral pH conditions. AU - Wang,Xiang-Qin, AU - Liu,Chuan-Ping, AU - Yuan,Yong, AU - Li,Fang-bai, Y1 - 2014/05/14/ PY - 2014/02/16/received PY - 2014/04/15/revised PY - 2014/05/02/accepted PY - 2014/5/27/entrez PY - 2014/5/27/pubmed PY - 2015/1/17/medline KW - Arsenic KW - Bio-electro-Fenton process KW - Microbial fuel cell KW - Oxidation KW - γ-FeOOH SP - 200 EP - 9 JF - Journal of hazardous materials JO - J Hazard Mater VL - 275 N2 - 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 H2O2 and Fe(II), were generated in situ by microbial-driven electro-reduction of O2 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. SN - 1873-3336 UR - https://www.unboundmedicine.com/medline/citation/24857903/Arsenite_oxidation_and_removal_driven_by_a_bio_electro_Fenton_process_under_neutral_pH_conditions_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0304-3894(14)00338-0 DB - PRIME DP - Unbound Medicine ER -