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Hydrothermal synthesis of star-shaped Bi5O7Br catalysts with strong visible light catalytic performance

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Abstract

Micron star-shaped Bi5O7Br catalysts were synthesized, with Bi(NO3)3·5H2O and cetyltrimethylammonium bromide (CTAB) as raw materials, by using a simple hydrothermal method. X-ray diffraction (XRD), scanning electron microscopy (SEM), high-resolution transmission electron microscopy (HRTEM), and UV–visible diffuse reflectance spectroscopy (UV–vis DRS) were used to characterize the samples. It was found that tetragonal star-shaped Bi5O7Br crystals with high crystallinity could be obtained as pH value of the solution was about 9. Compared with flaky BiOBr particles, the star-shaped Bi5O7Br sample displayed red-shift in the UV–visible absorption edge, whereas the band gap was reduced to 2.57 eV and the specific surface area was increased. Among all samples, the star-shaped Bi5O7Br had the highest photocatalytic efficiency. After visible light irradiation for 10 min, the degradation rate of the rhodamine B (RhB) solution with a concentration of 10 mg·L−1 was almost 100%. Also, its photocatalytic activity was nearly unchanged after five cycles. It is believed that such Bi5O7Br could be used as stable and effective visible light catalysts.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China (51862034, 21767029, and 51962013), the Natural Science Foundation of Guangxi Province (2017GXNSFAA198197, and 2016GXNSFAA380139), the Talent Project of Yulin Normal University (G2020ZK14), as well as the Key R&D Program of Jiangxi Province (20192ACB20018, 20192ACB80007 and 20201BBE51011).

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Correspondence to Yuan Chen or Zhuohao Xiao.

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Zhu, L., Chen, Y., Xiao, Z. et al. Hydrothermal synthesis of star-shaped Bi5O7Br catalysts with strong visible light catalytic performance. Journal of Materials Research 36, 628–636 (2021). https://doi.org/10.1557/s43578-020-00051-y

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