Controllable synthesis and visible-light-responsive photocatalytic activity of Bi₂WO₆ fluffy microsphere with hierarchical architecture

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• 作者：Hui Huang ; Hongfeng Chen ; Yang Xia ; Xinyong Tao ; Yongping Gan ; Xianxian Weng ; Wenkui Zhang ; ^{msechem@zjut.edu.cn}
• 关键词：Hydrothermal ; Photocatalyst ; Bi2WO6 ; Fluffy microsphere
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 出版时间：15 March 2012
• 年：2012
• 卷：370
• 期：1
• 页码：132-138
• 全文大小：1366 K

文摘

Bismuth tungstate (Bi₂WO₆) has attracted great research interest as an important visible-light-responsive photocatalyst. In this paper, we report a facile hydrothermal route for the shape-controlled synthesis of micro/nanostructured Bi₂WO₆, without adding surfactants or templates. The results show that various morphologies of Bi₂WO₆ including coralloid spherical particles, packed nanosheets, fluffy microspheres, and plates can be obtained by adjusting the pH values of the precursors. The as-prepared porous fluffy microspheres with a hierarchical architecture synthesized at pH 8 exhibit the highest photocatalytic activity for the degradation of Rhodamine (RhB) under visible light irradiation. The photodegradation efficiency reaches as high as 99 % within 20 min irradiation. This enhanced photocatalytic activity can be attributed to the unique porous structure and high BET surface area of fluffy microspheres with hierarchical architecture.