Photocatalytic activities of Bi₂S₃/BiOBr nanocomposites synthesized by a facile hydrothermal process

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• 作者：Yumin Cui ; Qingfeng Jia ; Huiquan Li ; Jingyu Han ; Liangjun Zhu ; Shigang Li ; Ying Zou ; Jie Yang
• 关键词：Hydrothermal method ; Bi2S3/BiOBr ; Nanocomposites ; Photocatalysis ; Methyl orange
• 刊名：Applied Surface Science
• 出版年：30 January, 2014
• 年：2014
• 卷：290
• 期：Complete
• 页码：233-239
• 全文大小：1916 K

文摘

Bi₂S₃/BiOBr nanocomposites with various weight percents of Bi₂S₃ were successfully prepared by a facile hydrothermal process at 433 K, and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution transmission electron microscopy (HR-TEM), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy, energy dispersive X-ray spectroscopy (EDS), UV-vis diffuse reflection spectra (UV-vis DRS) and nitrogen physisorption studies. The UV and visible photocatalytic activities of the as-prepared Bi₂S₃/BiOBr samples were evaluated by the photo-degradation of methyl orange (MO) in an aqueous solution. The results showed that the photocatalytic activity of the Bi₂S₃/BiOBr samples was greatly enhanced, compared with that over pure Bi₂S₃ and BiOBr. The enhanced photocatalytic activities could be mainly attributed to the effective transfer of the photogenerated electrons and holes at the heterojunction interface of Bi₂S₃ and BiOBr, which reduced the recombination of electron-hole pairs, and the mechanism of photocatalytic activity enhancement was discussed.