Microwave Irradiation Synthesis and Photocatalytic Performance of Z-scheme Hierarchical Microspheres Bi2WO6/CdS/rGO
LIU Qi1, ZHAO Li1, SHEN Bing1, MA Zilun1, LU Jialin1, QU Wenwen1,2,3,*
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 MOE Key Laboratory of Unconventional Metallurgy, Kunming University of Science and Technology, Kunming 650093, China
Abstract: Herein, a novel Z-scheme Bi2WO6/CdS/rGO photocatalyst with hierarchical microsphere structure was fabricated via the microwave-assisted solvothermal method by integrating graphene (rGO) and Bi2WO6/CdS heterojunction. The effect of different graphene loading amounts on the photocatalytic performance of the composite was carefully investigated. The results exhibited that the Bi2WO6/CdS/rGO composite with 3wt% rGO addition could remove approximately 99.7% RhB under visible light irradiation within 30 min. The photocatalytic rate constant was 4.8 and 14.1-fold higher than that of pristine Bi2WO6 and CdS, respectively. The significant promotion in photocatalytic activity of the composite came from the deep conduction band and the strong internal electronic field generated at the Z-scheme heterointerface between Bi2WO6 and CdS boosted the kinetics of photoexcited carriers transfer and separation. Furthermore, the prolonged lifetime of the heterojunction revealed that rGO could act as the electronic transfer channel owing to its excellent electron conductivity, endowing a lower recombination rate of photogenerated electron-hole pairs. Benefited from the broad-spectrum light-harvesting range and the enriched active sites of rGO, the photocatalytic performance of the composite was further enhanced. This work provides a fresh insight that interface engineering based on co-modification of semiconductors can effectively enhance the photocatalytic remediation activity.
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2025, Vol. 39 
