Effect of Solvents on Morphology and Photocatalytic Performance of Bi2WO6/RGO
CHEN Ruifang1, QU Wenwen1,2,3, WANG Yijun1, MA Baokua1, CHEN Shangmin1
1 Faculty of Science, Kunming University of Science and Technology, Kunming 650500, China 2 National Local Joint Laboratory of Engineering Application of Microwave Energy and Equipment Technology, Kunming University of Science and Technology, Kunming 650093, China 3 The Key Laboratory of Unconventional Metallurgy, Ministry of Education, Kunming University of Science and Technology, Kunming 650093, China
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.
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2021, Vol. 35 
