溶剂对钨酸铋/石墨烯形貌结构和光催化性能的影响

doi:10.11896/cldb.20010110

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Abstract Aseries of visible-light-driven Bi₂WO₆/RGO photocatalysts were prepared by solvothermal processes with different kinds of solvents including ethylene glycol, ethylene diamine, deionized water-ethylene glycol, deionized water-ethylene diamine, deionized water and deionized water-aceticacid. The morphology, structure and photocatalytic performance of the obtained samples were characterized and analyzed. The results show that solvents have a great influence on the morphology and photocatalytic activity of Bi₂WO₆/RGO photocatalysts. Under visible light irradiation (λ>420 nm), the photocatalytic activities of Bi₂WO₆/RGO photocatalysts were evaluated by the decomposition of Rhodamine B (RhB). Among them, the sample prepared using deionized water as solvent exhibited the best photocatalytic performance. The degradation rate of RhB reached 98% within 20 minutes, and after five cycles the degradation of RhB remained approximately constant, suggesting the excellent chemical stability of the catalyst. The enhanced photocatalytic activity of Bi₂WO₆/RGO composite could be attributed to the formation of Bi₂WO₆ hierarchical microspheres in aqueous solvents, which provide more reactive sites for photocatalytic reactions, and the introduction of graphene increases the specific surface area of the material, further promoting the effective separation of the electron-hole pairs. In addition, trapping experiments of the predominant radical species were conducted, which indicates the photo-generated holes (h⁺) played a major role in the photodegradation of RhB, and the effect of ·O₂^- and ·OH on the photodegradation of RhB also cannot be ignored.

Key words： Bi₂WO₆/RGO solvothermal method Rhodamine B (RhB) photocatalysis

Published: 23 March 2021

CLC number:	TB321
	O469

Fund:National Natural Science Foundation of China (51562018, 51004059).

About author:: Ruifang Chen received her M.S. degree in applied chemical physics from Kunming University of Science and Technology in June 2020. Her current research interests focus on the synthesis of semiconductor photoca-talysts to utilize solar energy for environmental remediation.
Wenwen Qu received her Ph.D. degree in physical chemistry from Beijing Normal University in 2006. She is currently a professor of chemistry in Faculty of Science, Kunming University of Science and Technology, China. Her research interests include microwave-assisted synthesizing semiconductor photocatalytic materials, computational modeling surface/interface structures and properties based on the first principles, and recovery and regeneration of spent catalysts.

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Cite this article:

CHEN Ruifang,QU Wenwen,WANG Yijun, et al. Effect of Solvents on Morphology and Photocatalytic Performance of Bi₂WO₆/RGO[J]. Materials Reports, 2021, 35(6): 6008-6014.

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http://www.mater-rep.com/EN/10.11896/cldb.20010110 OR http://www.mater-rep.com/EN/Y2021/V35/I6/6008

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