Funct. Mater. 2021; 28 (2): 386-393.
In situ synthesis of Diatomite@BiOBr composites by a facile method and its application in visible-light-driven decomposition of rhodamine B
Department of Traffic and Municipal Engineering, Sichuan College of Architectural Technology, 610399 Chengdu, China
Diatomite@BiOBr composites were fabricated by a facile method in this study. The crystalline phase, morphology, particle size distribution, pore structure, and optical properties were characterized by X-ray diffraction, scanning electron microscope, laser particle sizer, N2 adsorption-desorption analysis, and UV-vis diffusion reflection spectra. Decomposition of rhodamine B under visible light (λ > 400 nm) was carried out to measure the photocatalytic activity of as-prepared composites. The results showed that the addition of diatomite can lead to the enhancement of photocatalytic activity of Diatomite@BiOBr composites, among which the composite with diatomite content of 40 % exhibited the highest photocatalytic activity up to 67.07 % within 50 min. This enhanced effect can be attributed to the fact that diatomite played the role of a platform, on which the BiOBr microsphere can evenly distribute increasing active sites, while diatomite can promote the separation of hole-electron pairs, thus enhancing the photocatalytic activity. Our findings may contribute to the use of natural porous mineral for the preparation highly efficient photocatalytic composites.
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