Journal
MATERIALS CHEMISTRY AND PHYSICS
Volume 246, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.matchemphys.2020.122827
Keywords
Photocatalyst; Semiconductor heterojunction; WO3/MoS2-rGO nanocomposite; Photocatalytic efficiency; Z-scheme system
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Funding
- National Natural Science Foundation of China [61674113, 51622507, 61471255, 51576002, 201901D111099]
- Natural Science Foundation of Shanxi Province, China [2016011040]
- Scientific and Technologial Innovation Programs of Higher Education Institutions in Shanxi Province, China [2016138]
- Norwegian Research Council FRINATEK programme [231416/F20]
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In this paper, we aim to design a new photocatalyst with enhanced photocatalytic efficiency by the synergistic construction of a Z-scheme photocatalytic system composed with reduced graphene oxide (rGO)-bridged tungsten trioxide (WO3) and molybdenum disulfide (MoS2). This system shows excellent photocatalytic performances in the degradation of Rhodamine B. WO3/MoS2-rGO nanocomposite with 10% mass fraction of MoS2-rGO exhibits the highest degradation rate of 98.3% under 20 min's visible light irradiation. The degradation rate derived from the apparent first-order kinetics model is calculated as 0.00644 min(-1), which is 1.8 and 1.6 times higher than those of pure WO3 and WO3/MoS2. Radical trapping experiment reveals the photo-induced active species hydroxyl and holes are the predominant active species during the reaction. The photocatalytic mechanism of WO3/MoS2-rGO nanocomposite is explained under Z-scheme system theory. Our research may provide new insights into the design and fabrication of high-efficient photocatalyst.
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