Hydrogen Evolution from Water Coupled with the Oxidation of As(III) in a Photocatalytic System

Jian Ping Zou, Dan Dan Wu, Shao Kui Bao, Jinming Luo, Xu Biao Luo, Si Liang Lei, Hui Long Liu, Hong Mei Du, Sheng Lian Luo*, Chak Tong AU, Steven L. Suib

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)

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 excellentstability, 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.

Original languageEnglish
Pages (from-to)28429-28437
Number of pages9
JournalACS applied materials & interfaces
Volume7
Issue number51
DOIs
Publication statusPublished - 30 Dec 2015

Scopus Subject Areas

  • Materials Science(all)

User-Defined Keywords

  • arsenates
  • arsenite oxidation
  • catalysts
  • hydrogen evolution
  • photocatalysis

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