title: Hydrogen Evolution from Water Coupled with the Oxidation of As(III) in a Photocatalytic System.
abstract: A series of heterostructured CdS/Sr2(Nb17/18Zn1/18)2O7-δ composites with excellent photocatalytic ability for simultaneous hydrogen evolution and As(III) oxidation under simulated sunlight were synthesized and characterized. Among them, 30% CdS/Sr2(Nb17/18Zn1/18)2O7-δ (30CSNZO) has the highest in activity, exhibiting a H2 production rate of 1669.1 μmol·h(-1)·g(-1) that is higher than that of many photocatalysts recently reported in the literature. At pH 9, As(III) is completely oxidized to As(V) over 30CSNZO in 30 min of irradiation of simulated sunlight. In the photocatalytic system, H2 production rate decreases with the increase of As(III) concentration, and the recycle experiments show that 30CSNZO exhibits excellent stability, durability, and recyclability for photocatalytic hydrogen evolution and As(III) oxidation. We propose a mechanism in which superoxide radical (·O2(-)) is the active species for As(III) oxidation and the oxidation of As(III) has an effect on hydrogen evolution. For the first time, it is demonstrated that simultaneous hydrogen evolution and arsenite oxidation is possible in a photocatalytic system.
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University , Nanchang, Jiangxi 100044, PR China.
authors.forename: Jian-Ping
authors.initials: JP
authors.lastname: Zou
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University , Nanchang, Jiangxi 100044, PR China.
authors.forename: Dan-Dan
authors.initials: DD
authors.lastname: Wu
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University , Nanchang, Jiangxi 100044, PR China.
authors.forename: Shao-Kui
authors.initials: SK
authors.lastname: Bao
authors.affiliation: Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences , Beijing 100864, PR China.
authors.forename: Jinming
authors.initials: J
authors.lastname: Luo
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University , Nanchang, Jiangxi 100044, PR China.
authors.forename: Xu-Biao
authors.initials: XB
authors.lastname: Luo
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University , Nanchang, Jiangxi 100044, PR China.
authors.forename: Si-Liang
authors.initials: SL
authors.lastname: Lei
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University , Nanchang, Jiangxi 100044, PR China.
authors.forename: Hui-Long
authors.initials: HL
authors.lastname: Liu
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University , Nanchang, Jiangxi 100044, PR China.
authors.forename: Hong-Mei
authors.initials: HM
authors.lastname: Du
authors.affiliation: Key Laboratory of Jiangxi Province for Persistent Pollutants Control and Resources Recycle, Nanchang Hangkong University , Nanchang, Jiangxi 100044, PR China.
authors.forename: Sheng-Lian
authors.initials: SL
authors.lastname: Luo
authors.affiliation: State Key Laboratory of Environmental and Biological Analysis, Hong Kong Baptist University , Kowloon Tong, Hong Kong 999077, PR China.
authors.forename: Chak-Tong
authors.initials: CT
authors.lastname: Au
authors.affiliation: Department of Chemistry, University of Connecticut , Storrs, Connecticut 06269, United States.
authors.forename: Steven L
authors.initials: SL
authors.lastname: Suib
keywords: arsenates; arsenite oxidation; catalysts; hydrogen evolution; photocatalysis