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Synthesis of Z-scheme (001)-TiO2/Bi5O7I heterojunctions with enhanced interfacial charge separation and photocatalytic degradation of Rhodamine B

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Abstract

A Z-scheme heterojunction was constructed by loading (001)-faceted TiO2 onto Bi5O7I through a simple deposition method. Characterization of the obtained photocatalysts included SEM, TEM, XRD, FT-IR, XPS, UV–vis DRS, and PL. The results showed that (001)-TiO2 nanosheets had been successfully anchored to the Bi5O7I nanobelts and the heterojunctions had been formed between them. The catalytic ability of the samples was assessed by degradation of Rhodamine B (RhB). The sample TB-20 exhibited the greatest apparent rate (0.04315 min−1), which was about 3 times that of pure Bi5O7I. The enhanced photocatalytic activity can be attributed to the visible response and charge division of the (001)-TiO2/Bi5O7I composite. The recyclability of the catalyst also showed good stability after four cycles with 90% degradation efficiency. Moreover, the degradation of RhB follows pseudo-first-order kinetics by non-linear least squares fitting to the degradation data. A plausible photocatalytic reaction mechanism has also been presented.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China: [Grant Number 81974317].

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  1. School of Materials Science and Engineering, Shanghai University of Engineering Science, Shanghai, China

    Xin Mai, Wensong Lin, Junnan Chen, Qian Yang & Ran Gao

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  1. Xin Mai
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Correspondence to Wensong Lin.

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Mai, X., Lin, W., Chen, J. et al. Synthesis of Z-scheme (001)-TiO2/Bi5O7I heterojunctions with enhanced interfacial charge separation and photocatalytic degradation of Rhodamine B. Reac Kinet Mech Cat 135, 3447–3459 (2022). https://doi.org/10.1007/s11144-022-02309-4

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