Solvent directed fabrication of Bi₂WO₆ nanostructures with different morphologies: Synthesis and their shape-dependent photocatalytic properties

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• 作者：Yuwei Mi ; Suyuan Zeng ; Lei Li ; Qingfu Zhang ; Suna Wang ; Caihua Liu ; Dezhi Sun
• 关键词：A. Microporous materials ; A. Nanostructures ; B. Chemical synthesis ; D. Catalytic properties
• 刊名：Materials Research Bulletin
• 出版年：2012
• 出版时间：September, 2012
• 年：2012
• 卷：47
• 期：9
• 页码：2623-2630
• 全文大小：1875 K

文摘

In this work, Bi₂WO₆ with complex morphologies, namely, flower-like, pancake-like, and tubular shapes have been controllably synthesized by a facile solvothermal process. The as-obtained samples are systematically investigated using X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM) and high resolution transmission electron microscopy (HRTEM). The effects of solvents on the morphologies of Bi₂WO₆ nanostructures are systematically investigated. According to the time-dependent experiments, a two-step growth mode basing on Ostwald ripening process and self-assembly has been proposed for the formation of the flower-like and pancake-like Bi₂WO₆ nanostructures. The photocatalytic properties of Bi₂WO₆ nanostructures are strongly dependent on their shapes, sizes, and structures for the degradation of rhodamine B (RhB) under visible-light irradiation. The deduced reasons for the differences in the photocatalytic activities of these Bi₂WO₆ nanostructures are further discussed.