Controlled synthesis of three-dimensional hierarchical Bi₂WO₆ microspheres with optimum photocatalytic activity

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• 作者：Hong Wang ; Jimei Song ; ^{jmsongsss@163.com} ; Hui Zhang ; Fei Gao ; Shaojuan Zhao ; Haiqin Hu
• 关键词：A. Inorganic compounds ; A. Microporous materials ; B. Chemical synthesis ; C. X-ray diffraction ; D. Catalytic properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 出版时间：February 2012
• 年：2012
• 卷：47
• 期：2
• 页码：315-320
• 全文大小：953 K

文摘

Three-dimensional (3D) hierarchical Bi₂WO₆ microsphere and octahedral Bi₂WO₆ have been synthesized by a facile hydrothermal method using KNO₃ solution and distilled water as solvent, respectively. The obtained products were characterized by X-ray diffraction, scanning electron microscopy, N₂ adsorption/desorption, and UV-vis diffuse reflectance spectroscopy in detail. The concentration of KNO₃ played a key role in the formation of 3D hierarchical Bi₂WO₆ microspheres. A possible formation mechanism of Bi₂WO₆ microsphere was proposed. The photocatalytic activity of the as-synthesized products was evaluated by monitoring the degradation of MB solution under sunlight irradiation. It was found that the photocatalytic activity of the 3D hierarchical Bi₂WO₆ microsphere was superior to the octahedral Bi₂WO₆, which was attributed to the larger surface area and special hierarchical structure of Bi₂WO₆ microsphere.