Funct. Mater. 2021; 28 (3): 505-511.

doi:https://doi.org/10.15407/fm28.03.505

Study on the microstructure and enhanced photocatalytic performance of BiOClxBr1-x solid solution

Wei He1,2, Gang Liao1,2

1Department of Traffic and Municipal Engineering, Sichuan College of Architectural Technology, 610399 Sichuan Chengdu, China
2Deyang Key Laboratory of Building and Bridge Structure Engineering, Sichuan College of Architectural Technology, 618000 Sichuan Deyang, China

Abstract: 

The solid solution BiOClxBr1-x with different Br/Cl ratios was prepared by a simple low-temperature wet chemical method. The crystal structure, morphology and optical properties were characterized using X-ray diffraction, scanning electron microscopy with energy dispersive spectroscopy and diffuse reflectance spectra in the UV-visible region. RhB was chosen as the target pollutant; its degradation under light with a wavelength of > 400 nm was carried out to assess the photocatalytic efficiency of pre-prepared photocatalysts. The results showed that the microstructure and photocatalytic activity of the BiOBrxCl1-x solid solution can be controlled by changing the Br/Cl ratio, the most optimal value of the Br/Cl ratio was 0.8:0.2. The reaction rate constant was 0.06446, which is 1.1 times higher than for pure BiOBr. This enhanced effect can be explained by the unique crystal structure and well-positioned macropores, which can reduce the band gap and facilitate the migration of RhB molecules. Our results can help to improve the photocatalytic performance of BiOX (X = Cl, Br and I).

Keywords: 
BiOX, solid solution, photocatalytic efficiency, wet chemical method.

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