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Controlled preparation of fiber-shaped 4-Br/Bi2O3 composite photocatalysts with excellent visible-light photocatalytic activity

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Abstract

In this paper, a series of Bi2O3 modified by 4-bromothiophenol named 4-Br/Bi2O3 composite photocatalysts were successfully synthesized via a facile two-step hydrothermal route. The obtained photocatalysts were characterized by XRD, TEM, SEM, SEM–EDS, XPS, UV–Vis DRS, PL and FT-IR, respectively. It could be observed that the pure Bi2O3 exhibited a rod-shaped structure, while the micro-morphologies of 4-Br/Bi2O3 composites displayed a uniform solid fiber-like structure, which could increase specific surface area and offer more photocatalytic active sites, ultimately enhancing the adsorption capacity and photocatalytic performance of photocatalysts. The 4-Br/Bi2O3 composite with hydrothermal time for preparation being 12 h in the second-step hydrothermal process exhibited the best photocatalytic activity, over which (the dosage of 50 mg) about 99.4% of malachite green(MG) with the initial concentration of 35 mg L−1 in solution was degraded after irradiation for 80 min. Its photocatalytic performance was tremendously improved compared with pure Bi2O3 (only 4.4% decomposition of MG), and this is ascribed to a widening of the photoresponse range and an improved separation efficiency of the current carriers of the composite. The four cyclic reactions revealed its high stability and reusability. Moreover, the active species trapping experiments indicated that ·O2− and h+ were the main active species in the photocatalytic degradation of MG. A possible enhanced photocatalytic mechanism of 4-Br/Bi2O3 composite photocatalysts was also proposed.

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  1. School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, China

    Dian Luo & Yong Kang

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  1. Dian Luo
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  2. Yong Kang
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Correspondence to Yong Kang.

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Luo, D., Kang, Y. Controlled preparation of fiber-shaped 4-Br/Bi2O3 composite photocatalysts with excellent visible-light photocatalytic activity. J Mater Sci 54, 1549–1565 (2019). https://doi.org/10.1007/s10853-018-2901-4

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