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AgI Nanoparticles Decorated Bi24O31Br10 Nanosheets: An Efficient 0D/2D Z-Scheme Heterojunction Photocatalyst for the Degradation of Rhodamine B

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Abstract

A novel 0D/2D Z-scheme AgI/Bi24O31Br10 photocatalyst was prepared through the simple solvothermal and coprecipitation method, in which AgI nanoparticles were decorated on the surface of Bi24O31Br10 nanosheets. The AgI/Bi24O31Br10 composites exhibited improved photocatalytic activity for the degradation of rhodamine B (RhB) in comparison with pristine Bi24O31Br10 and AgI under simulated sunlight irradiation. Specifically, AB-30 (mass fraction of AgI, 30%) composite exhibited remarkable photocatalytic activity of 97.6% towards RhB degradation under 120 min of simulated sunlight irradiation, and its RhB degradation rate constant (k) was approximately 20.7 and 2.9 times higher than that of pure Bi24O31Br10 and AgI, respectively. The improvement of photocatalytic performance of as-prepared AgI/Bi24O31Br10 heterojunction composites was ascribed to the synergistic effect of wide visible-light harvest capacity and the rapid transfer and separation efficiency of charge carriers. UV–vis diffuse reflectance spectra (DRS) analysis validated that the introduction of AgI could broaden the visible-light absorption of AgI/Bi24O31Br10 composite. The results of electrochemical impedance (EIS), photocurrent response and photoluminescence spectra (PL) tests showed that AgI/Bi24O31Br10 composite possessed the efficient separation and migration of photogenerated charge carriers. Trapping experiments of free radicals certified that ·O2 was the main reactive species in the process of degradation. And a probable photocatalytic mechanism of Z-scheme heterojunction between Bi24O31Br10 and AgI was proposed.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21076092, 21376099, 21546002, 21878115).

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Correspondence to Xinyan Xiao.

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Ding, T., Xiao, X., Wang, Y. et al. AgI Nanoparticles Decorated Bi24O31Br10 Nanosheets: An Efficient 0D/2D Z-Scheme Heterojunction Photocatalyst for the Degradation of Rhodamine B. J Inorg Organomet Polym 30, 4954–4968 (2020). https://doi.org/10.1007/s10904-020-01745-w

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