Synthesizing Bi₂O₃/BiOCl heterojunctions by partial conversion of BiOCl

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• 作者：Qihang Zhao ; Xiaoyan Liu ; Yongxing Xing ; Zhiliang Liu…
• 刊名：Journal of Materials Science
• 出版年：2017
• 出版时间：February 2017
• 年：2017
• 卷：52
• 期：4
• 页码：2117-2130
• 全文大小：
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics;
• 出版者：Springer US
• ISSN：1573-4803
• 卷排序：52

文摘

In this work, uniform BiOCl microspheres were used as self-sacrificed template to construct Bi₂O₃/BiOCl heterojunctions by a simple alkaline treatment method. Details of structure and chemical properties were carefully characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy (TEM), high-resolution TEM, X-ray photoelectron spectroscopy, UV–vis diffuse reflectance spectroscopy, and Brunauer–Emmett–Teller techniques. The results indicated that BiOCl microspheres composed of numerous nanosheets transformed to rod-like Bi₂O₃ nanostructures during the alkaline treatment, which resulted in strong visible-light absorption. The as-obtained Bi₂O₃/BiOCl heterojunctions exhibited remarkably enhanced photocatalytic performance for the degradation of methyl orange (MO) under visible-light irradiation, which was ~1.2 and 2.5 times as that of pure BiOCl and Bi₂O₃, respectively. The formation of Bi₂O₃/BiOCl heterojunctions facilitated the transfer and separation of photogenerated charge carriers which was further confirmed by the photocurrent measurement and photoluminescence spectra results. The finding reported here offers a valid in situ route for constructing heterojunction photocatalysts to effectively decompose the organic pollutants in aqueous solution.