标題：Rapid catalytic oxidation of arsenite to arsenate in an iron(III)/sulfite system under visible light作者：Xu, Jing; Ding, Wei; Wu, Feng; Mailhot, Gilles; Zhou, Danna; Hanna,Khalil

來源出版物：APPLIED CATALYSIS B-ENVIRONMENTAL 卷：186 頁碼：56-61 DOI: 10.1016/j.apcatb.2015.12.033 出版年：JUN 5 2016

摘要：Removal of arsenic in industrial wastewaters proceeds often through oxidation of As(III) to As(V) following by precipitation and/or adsorption. In this work, the catalytic oxidation of As(III) to As(V) in an iron(III)/sulfite system and the removal of As(V) under visible light using sunlight or a light-emitting diode lamp were investigated. Our results show a significant enhancement of efficiency of As(III) oxidation at near-neutral pH, whereas 93% of As(III) was removed from solution by centrifugal treatment after 30min of irradiation. Mechanism investigations revealed that the pathways of As(III) oxidation at circumneutral pH involved free radicals (mainly HO center dot, SO4-center dot and SO5-center dot) and ligand-to-metal charge transfer between As(III) and colloidal ferric hydroxide particles. Sequential addition of sulfite could improve the oxidation efficiency for water having high concentrations of As(III) (i.e., 66.7 mu M). These results clearly show that the visible light/iron(III)/sulfite system significantly enhances As(III) oxidation. This finding may have promising implications in developing a new cost-effective technology for the treatment of arsenic-containing water using sunlight.

入藏号：WOS:000370305900006

文獻類型：Article

語種：English

作者關鍵詞：Arsenic, Iron(III)/sulfite, Solar light, Photooxidation, Oxysulfur radicals

擴展關鍵詞：PHOTOCHEMICAL OXIDATION; PHOTOCATALYTIC OXIDATION; HYDROGEN-PEROXIDE; AQUEOUS-SOLUTIONS; PULSE-RADIOLYSIS; OXIDIZING-AGENT; ORANGE II; ARSENIC(III); REMOVAL; OXYGEN

通訊作者地址：Wu, F, Wuhan Univ, Sch Resources & Environm Sci, Dept Environm Sci, Hubei Key Lab Biomass Resource Chem & Environm Bi, Wuhan 430079, Peoples R China.

Hanna, K, Ecole Natl Super Chim Rennes, CNRS, UMR 6226, 11 Allee Beaulieu,CS 50837, F-35708 Rennes 7, France.

電子郵件地址：fengwu@whu.edu.cn; khalil.hanna@ensc-rennes.fr

地址：

[Xu, Jing; Ding, Wei; Wu, Feng] Wuhan Univ, Sch Resources & Environm Sci, Dept Environm Sci, Hubei Key Lab Biomass Resource Chem & Environm Bi, Wuhan 430079, Peoples R China.

[Xu, Jing; Hanna, Khalil] Ecole Natl Super Chim Rennes, CNRS, UMR 6226, 11 Allee Beaulieu,CS 50837, F-35708 Rennes 7, France.

[Mailhot, Gilles] Clemson Univ, Univ Blaise Pascal, ENSCCF, ICCF, BP10448, F-63000 Clermont Ferrand, France.

[Zhou, Danna] China Univ Geosci, Fac Mat Sci & Chem, Wuhan 430074, Peoples R China.

研究方向：Chemistry; Engineering

ISSN：0926-3373

eISSN: 1873-3883

影響因子（2014）：7.435