Chinese Journal of Catalysis ›› 2018, Vol. 39 ›› Issue (9): 1470-1483.DOI: 10.1016/S1872-2067(18)63111-0

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Enhanced photocatalytic performance of MoS2 modified by AgVO3 from improved generation of reactive oxygen species

Yingying Qina, Hong Lia, Jian Luc, Yongsheng Yanc, Ziyang Lue, Xinlin Liub   

  1. a Research Center of Fluid Machinery Engineering and Technology, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
    b School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
    c Institute of Green Chemistry and Chemical Technology, School of Chemistry and Chemical Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China;
    d School of Environment and Safety Engineering, Jiangsu University, Zhenjiang 212013, Jiangsu, China
  • Received:2018-02-22 Revised:2018-05-20 Online:2018-09-18 Published:2018-07-19
  • Contact: 10.1016/S1872-2067(18)63111-0
  • Supported by:

    This work was supported by the National Natural Science Foundation of China (21706104), the Natural Science Foundation of Jiangsu Province (BK20150484), the China Postdoctoral Science Foundation (2015M570416), and the financial support of the Research Foundation of Jiangsu University, China (14JDG148).

Abstract:

In this work, an efficient AgVO3/MoS2 composite photocatalyst was successfully synthesized via a hydrothermal method. The photocatalytic activity of the as-prepared photocatalyst was evaluated by using it for assessing the degradation of different organic pollutants under visible-light irradiation. The composite 3%-AgVO3/MoS2 catalyst demonstrated a significantly enhanced photocatalytic activity compared to the pure compounds (AgVO3 and MoS2). The reason behind the excellent photocatalytic performance was the modification of MoS2 by AgVO3 to facilitate O2 adsorption/activation. In addition, the composite catalyst facilitates the two-electron oxygen reduction reaction whereby H2O2 is generated on the surface of MoS2 to produce additional reactive oxygen species (ROSs). ESR coupled with the POPHA fluorescence detection method and a free radical capture experiment were used to elucidate the mechanism of formation of the ROSs, including ·OH, ·O2- and H2O2. Furthermore, the generation of additional ROSs could accelerate electron consumption, leaving behind more holes for the oxidation of organic pollutants. A possible photocatalytic mechanism of the composite is also discussed.

Key words: Reactive oxygen specie, AgVO3/MoS2, Photocatalyst, Visible light, Organic pollutant