Abstract
Bi2O3/BiOI step-scheme(S-scheme) heterojunction photocatalyst was synthesized by green calcination method, its degradation ability of methylene blue was investigated, and the photocatalytic performance of the Bi2O3/BiOI heterojunction, Bi2O3 and BiOI was compared. The structure and morphology of the samples were characterized by X- ray diffraction(XRD), field emission scanning electron microscopy (FESEM), and UV-vis diffuse reflection spectrum (UV-vis DRS). The degradation rate of methylene blue was analysised by spectrophotometry, and the calculation result showed that the degradation rate of methylene blue was 97.8% in 150 minutes. The first order kinetic rate constant of 10%Bi2O3/BiOI is 0.021 8 min−1, which are 2.37 and 2.68 times of BiOI(0.009 18 min−1) and Bi2O3 (0.008 03 min−1) respectively. The calculation result shows that the work function of Bi2O3 and BiOI are 3.0 eV and 6.0 eV, respectively, by density functional theory(DFT). When this S-scheme heterojunction is used as a photocatalyst, the weaker electrons in the conduction band of BiOI will be combined with the weaker holes in the Bi2O3 valence band under combined effect with built-in electric field and band bending, which will retain stronger photoelectrons and holes between Bi2O3 and BiOI. This may be the internal reason for the efficient degradation of tetracycline by Bi2O3/BiOI S-scheme heterostructures.
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Funding
Funded by National Natural Science Foundation of China (No.21769009), Project of Innovation and Entrepreneurship for College Students in Hubei Minzu University (No.S202010517044), The foundation of Key Laboratory of Green Manufacturing of Super-light Elastomer Materials of State Ethnic Affairs Commission. (Hubei Minzu University)(No.PT092101), The Open Project of Guangxi Key Laboratory of Chemistry and Engineering of Forest Products(No.GXFK1904), and Specific Research Project of Guangxi for Research Bases and Talents(No.AD18126005)
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Jiang, X., Tan, H., Shi, X. et al. Preparation of Bi2O3/BiOI Step-scheme Heterojunction Photocatalysts and Their Degradation Mechanism of Methylene Blue. J. Wuhan Univ. Technol.-Mat. Sci. Edit. 37, 801–806 (2022). https://doi.org/10.1007/s11595-022-2599-7
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DOI: https://doi.org/10.1007/s11595-022-2599-7