Hierarchical WO3 Hollow Shells: Dendrite, Sphere, Dumbbell, and Their Photocatalytic Properties

Authors

  • Di Chen,

    1. International Center for Materials Nanoarchitectonic, Photocatalytic Materials Center, National Institute for Materials Science 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
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  • Jinhua Ye

    Corresponding author
    1. International Center for Materials Nanoarchitectonic, Photocatalytic Materials Center, National Institute for Materials Science 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan)
    2. Department of Materials Science and Engineering, Nanjing University Nanjing 210093 (PR China)
    • International Center for Materials Nanoarchitectonic, Photocatalytic Materials Center, National Institute for Materials Science 1-2-1 Sengen, Tsukuba, Ibaraki 305-0047 (Japan).
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  • This work was partially supported by the Global Environment Research Fund, MEXT, Japan, and National Natural Science Foundation of China (No. 50732004 and 20528302), the Jiangsu Provincial Natural Science Foundation (No. BK2006718). The authors are also grateful to Ms. Liqun Yang, Mr. Shuxin OuYang, and Dr. Xiukai Li for their help with the experimental work.

Abstract

In this work, hierarchical WO3 hollow shells: dendrites, spheres and dumbbells have been successfully synthesized by simply calcining the acid-treated PbWO4 and SrWO4 as precursors at 500 °C for 2 h. These hollow structures were characterized using X-ray diffraction, scanning and transmission electron microscopies, Brunauer–Emmet–Teller surface area and diffuse reflectance spectroscopy, respectively. Possible formation mechanisms for hollow WO3 shells consisted of tiny nanoplatelets were investigated in detail. Comparing with commercial WO3 particles, all the obtained hollow shells with larger BET surface areas showed enhanced photocatalytic activities for the degradation of organic contaminants under visible light irradiation.

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