The effect of carbon content on the structure and photocatalytic activity of nano-Bi₂WO₆ powder

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• 作者：Yumin Cui ; Huiquan Li ; Wenshan Hong ; Suhua Fan ; Liangjun Zhu
• 关键词：Hydrothermal method ; Carbon-doped Bi2WO6 ; Carbon content ; Photocatalysis ; OH radicals
• 刊名：Powder Technology
• 出版年：2013
• 出版时间：October, 2013
• 年：2013
• 卷：247
• 期：Complete
• 页码：151-160
• 全文大小：2275 K

文摘

Carbon-doped nano-Bi₂WO₆ photocatalysts with different carbon contents were successfully prepared by a facile hydrothermal method at 433 K, and characterized by XRD, BET, XPS, TEM, HR-TEM, SEM, EDX, photoluminescence (PL) and UV-vis spectroscopy. The photocatalytic activity of C-Bi₂WO₆ was evaluated from the analysis of the photodegradation of methylene blue (MB). The results show that the C-Bi₂WO₆ photocatalysts exhibit an orthorhombic Bi₂WO₆ phase. With the increase of carbon content, the absorption intensity of C-Bi₂WO₆ samples increases in the 410-650 nm region and the absorption edge has a little shift to long wavelength. Compared with reference C-TiO₂ or pure Bi₂WO₆, 0.47 % C-Bi₂WO₆ shows obviously higher UV and visible light photocatalytic activities. The remarkably enhanced photocatalytic activities can be mainly attributed to the fact that the proper carbon doped into nano-Bi₂WO₆ increases its BET surface area, enhances the absorption in the 410-650 nm region, improves the separation efficiency of photogenerated electrons and holes, and enhances the formation rate of OH on its surface.