Fabrication of FeWO4@ZnWO4/ZnO Heterojunction Photocatalyst: Synergistic Effect of ZnWO4/ZnO and FeWO4@ZnWO4/ZnO Heterojunction Structure on the Enhancement of Visible-Light Photocatalytic Activity

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• 作者：Fangzhi Wang ; Wenjun Li ; Shaonan Gu ; Hongda Li ; Xintong Liu ; Mingzhu Wang
• 刊名：ACS Sustainable Chemistry & Engineering
• 出版年：2016
• 出版时间：December 5, 2016
• 年：2016
• 卷：4
• 期：12
• 页码：6288-6298
• 全文大小：749K
• ISSN：2168-0485

文摘

One-dimensional FeWO₄@ZnWO₄/ZnO heterojunction photocatalysts were prepared by a two-step hydrothermal method. The heterojunction structure was formed through the dispersing of FeWO₄ nanoparticles on the surface of ZnWO₄/ZnO nanorods. The FeWO₄@ZnWO₄/ZnO photocatalyst possessed strong visible light absorption capacity. The photocatalytic activities of the prepared photocatalysts were evaluated by degradation of rhodamine B (RhB), methylene blue (MB), and phenol under visible light irradiation. Remarkably, the FeWO₄@ZnWO₄/ZnO composite showed superior photocatalytic activity than that of individual FeWO₄ and ZnWO₄/ZnO substrate. The enhanced photocatalytic activity could be attributed to the interfacial transportation of photogenerated holes between FeWO₄ and ZnWO₄/ZnO substrate, leading to more effective separation and faster transfer of carriers in the heterostructures, which was confirmed by photocurrent responses and photoluminescence spectral analysis. Radical trapping experiments indicated that hydroxyl radicals (^•OH) are the major reactive species. Moreover, a possible mechanism for the excellent photocatalytic activity of FeWO₄@ZnWO₄/ZnO composites was proposed.