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Catalysts 2017, 7(5), 153; doi:10.3390/catal7050153

Structure-Dependent Photocatalytic Performance of BiOBrxI1−x Nanoplate Solid Solutions

School of Materials Science and Engineering, Harbin University of Science and Technology, Harbin 150040, China
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Academic Editors: Giuseppe Marcì and Elisa I. García-López
Received: 19 April 2017 / Revised: 8 May 2017 / Accepted: 9 May 2017 / Published: 13 May 2017
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Abstract

BiOXxY1−x (X, Y = Cl, Br, and I) solid solutions have been regarded as promising photocatalysts attributed to their unique layered structure, tunable band structure, and chemical and optical stability. In this study, BiOBrxI1−x nanoplate solid solutions with a high exposure of {001} crystal facets were prepared by a facile alcoholysis method at room temperature and atmospheric pressure. X-ray diffraction (XRD) peaks exhibited a slight shift to lower diffraction angle with the increase of I content in BiOBrxI1−x samples, which resulted in a gradual increase in their cell parameters. Field emission scanning electron microscopy (FESEM) and transmission electron microscope (TEM) images revealed that BiOBrxI1−x samples exhibited 2D plate-like structure with the in-plane wrinkles. The regular changes in optical absorption threshold and Eg value seen in UV-vis diffuse reflectance spectra (UV-vis DRS) indicated that the optical absorption property and band structure could be modulated by the formation of BiOBrxI1−x solid solutions. The photocatalytic degradation of active dye Rhodamine B (RhB) over BiOBrxI1−x solid solutions showed that BiOBr0.75I0.25 had the best photocatalytic activity. The RhB photodegradation processes followed a pseudo-first-order kinetic model. The synergistic effect of structural factors (including amount of exposed {001} facets, interlayer spacing of (001) plane, and energy-level position of the valence band) determined the photocatalytic performance of BiOBrxI1−x solid solutions. View Full-Text
Keywords: bismuth oxyhalide; photocatalysis; exposed facets; interlayer spacing; band structure bismuth oxyhalide; photocatalysis; exposed facets; interlayer spacing; band structure
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Xu, H.-Y.; Han, X.; Tan, Q.; He, X.-L.; Qi, S.-Y. Structure-Dependent Photocatalytic Performance of BiOBrxI1−x Nanoplate Solid Solutions. Catalysts 2017, 7, 153.

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