Facile Synthesis of Hierarchically Structured Bi2S3/Bi2WO6 Photocatalysts for Highly Efficient Reduction of Cr(VI)

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• 作者：Ali Rauf ; Md. Selim Arif Sher Shah ; Gwan Hyun Choi ; Usama Bin Humayoun ; Dae Ho Yoon ; Jong Wook Bae ; Juhyun Park ; Woo-Jae Kim ; Pil J. Yoo
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2015
• 出版时间：November 2, 2015
• 年：2015
• 卷：3
• 期：11
• 页码：2847-2855
• 全文大小：671K
• ISSN：2168-0485

文摘

Varied morphologies and compositions of bismuth tungstate nanocomposites have been investigated as promising materials for photocatalytic applications. Among these nanocomposites, hierarchically structured bismuth sulfide (Bi₂S₃)/bismuth tungstate (Bi₂WO₆) hybrids have significant photocatalytic efficiency toward heavy metal ions. To simplify the synthetic procedure for this desirable composite, we developed a robust single-step hydrothermal synthesis for the formation of hierarchically structured heterocatalysts of Bi₂S₃/Bi₂WO₆ with a high yield (>95%). The synthesized heterostructures were characterized by various spectroscopic, microscopic, and surface area analysis techniques, which confirmed the successful incorporation of Bi₂S₃ into the Bi₂WO₆ matrix and were used to optimize pore size for enhanced catalytic activity. The resulting Bi₂S₃/Bi₂WO₆ heterocatalysts were used to remove toxic Cr(VI) ions via reduction to water insoluble Cr(III) utilizing visible-light irradiation. We also investigated the role of citric acid as a hole scavenger in the reduction of Cr(VI) with minimizing the rate of electron鈥揾ole recombination during photocatalysis. Likewise, the observed catalytic activity was significantly enhanced under a condition of an appropriate balance between hierarchical structure of catalysts and the amount of hole scavenger.