Journal
JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY A-CHEMISTRY
Volume 353, Issue -, Pages 557-563Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jphotochem.2017.12.021
Keywords
Microwave-assisted synthesis; Photocatalysis; Organic pollutant degradation
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Funding
- Shanghai Ocean University [A2-0203-00-100529]
- State Key Laboratory of Molecular Engineering of Polymers (Fudan University) [K2017-22]
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Constructing ternary plasmonic metal/semiconductor I/semiconductor II heterojunction is a promising approach to improve photocatalytic activity of semiconductor materials due to the effective inhibition for the recombination of photogenerated electron-hole pairs. Here, we report a microwave-assisted one-step rapid synthesis of ternary Ag/Ag2S/g-C3N4 heterojunction photocatalysts. In the one-step synthesis, Ag/Ag2S nanoparticles were deposited simultaneously on the surface of g-C3N4 within two minutes under atmospheric conditions. The robust semiconductor heterojunction was formed between Ag/Ag2S nanoparticles and g-C3N4 nanosheets. The resulting ternary heterojunction photocatalysts exhibited the enhanced visible-light absorption and the inhibited recombination of photogenerated electron-hole pairs due to surface plasmon resonance (SPR) and heterojunction effect. As a result, photocatalytic activity of the ternary Ag/Ag2S/g-C3N4 heterojunction photocatalysts was improved for photo degradation of rhodamine B (RhB) under visible-light irradiation. The optimum rate constant of the Ag/Ag2S/g-C3N4 heterojunction photocatalysts is 4.3 and 21.3 times higher than that of the raw g-C3N4 and the Ag/Ag2S. Based on the results of the active species trapping test, the mechanism of photocatalysis of the Ag/Ag2S/g-C3N4 heterojunction photocatalysts was also discussed. (C) 2017 Elsevier B.V. All rights reserved.
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