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Visible-Light Responsed Bi2WO6 Photocatalysts

Feng Yan, Wu Qingsong, Zhang Guoying, Sun yaqiu   

  1. College of Chemistry, Tianjin Normal University, Tianjin Key Laboratory of Structure and Performance for Functional Molecules, Key Laboratory of Inorganic-Organic Hybrid Functional Material Chemistry, Ministry of Education, 300387 Tianjin, China
  • Received: Revised: Online: Published:
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Bi2WO6 materials exhibit excellent visible-light photocatalytic activity due to the narrow band gap and special layered structure. This paper summarizes the research achievements on the improvements of photocatalytic property and practicability of Bi2WO6. Nanostructured Bi2WO6 materials are firstly introduced. The fabrication of Bi2WO6 nanostructures is found to be an effective strategy to enhance the photocatlytic activity for high surface areas. Then works on hierarchical Bi2WO6 superstructures are presented. In comparison with tiny Bi2WO6 nanostructures, the microscale superstructures are more practical for easy recovery. And channels or mesopores which are beneficial for ion transport often appear among nanostructured building units. Then the modification of Bi2WO6 photocatalyst is summarized which includes the composite heterostructures with metal oxides, surface deposition of metal or grapheme, and doping with metal ion or non-metal ion, etc. In addition, the immobilization techniques of Bi2WO6 materials are reviewed. Finally, the development trend of Bi2WO6 photocatalyts is prospected. It is emphasized that the band gap adjustment of Bi2WO6 and interfacial states of its heterostructures should be strengthened. And theoretical calculation would assist to in-depth understand the photocatalytic mechanism, which would be helpful in the improvement of existing photocatalysts and designing novel visible-light responsive photocatalyst. Contents
1 Introduction
2 Nanostructured Bi2WO6 photocatalyst
3 Hierarchical Bi2WO6 photocatalyst
3.1 Adjustment of medium acidity
3.2 Assistant of organic additive and template
3.3 Addition of inorganic salts
4 Heterostructured Bi2WO6 photocatalyst
4.1 Combination with metal oxide
4.2 Carbon modification
4.3 Metal deposition
5 Ion doping of Bi2WO6 photocatalyst
6 Immobilization of Bi2WO6 photocatalyst
7 Conclusion and prospect
Key words: Bi2WO6, photocatalysis, nanostructure, superstructure, heterostructure, doping

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