Citation: Yingying Qin, Hong Li, Jian Lu, Yongsheng Yan, Ziyang Lu, Xinlin Liu. Enhanced photocatalytic performance of MoS₂ modified by AgVO₃ from improved generation of reactive oxygen species[J]. Chinese Journal of Catalysis, ;2018, 39(9): 1470-1483. doi: 10.1016/S1872-2067(18)63111-0 shu

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

Yingying Qin ^a, ,
Hong Li ^a ,
Jian Lu ^c ,
Yongsheng Yan ^c ,
Ziyang Lu ^e ,
Xinlin Liu ^b

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 Date: 22 February 2018
Revised Date: 20 May 2018

Fund Project: 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).

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.
- Reactive oxygen specie,
- AgVO₃/MoS₂,
- Photocatalyst,
- Visible light,
- Organic pollutant
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Enhanced photocatalytic performance of MoS₂ modified by AgVO₃ from improved generation of reactive oxygen species