Journal
CHINESE JOURNAL OF CATALYSIS
Volume 39, Issue 9, Pages 1470-1483Publisher
SCIENCE PRESS
DOI: 10.1016/S1872-2067(18)63111-0
Keywords
Reactive oxygen specie; AgVO3/MoS2; Photocatalyst; Visible light; Organic pollutant
Funding
- National Natural Science Foundation of China [21706104]
- Natural Science Foundation of Jiangsu Province [BK20150484]
- China Postdoctoral Science Foundation [2015M570416]
- Research Foundation of Jiangsu University, China [14JDG148]
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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 O-2 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 center dot OH, center dot O-2(-) 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. (C) 2018, Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. All rights reserved.
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