标题：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
来源出版物：APPLIED CATALYSIS B-ENVIRONMENTAL 卷：186 页码：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
文献类型：Article
语种：English
作者关键词：Arsenic, Iron(III)/sulfite, Solar light, Photooxidation, Oxysulfur radicals
扩展关键词：PHOTOCHEMICAL OXIDATION; PHOTOCATALYTIC OXIDATION; HYDROGEN-PEROXIDE; AQUEOUS-SOLUTIONS; PULSE-RADIOLYSIS; OXIDIZING-AGENT; ORANGE II; ARSENIC(III); REMOVAL; OXYGEN
通讯作者地址：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.
电子邮件地址：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
影响因子（2014）：7.435
