Enhanced photo-catalytic activity of TiO2 nanostructured thin films under solar light by Sn and Nb co-doping

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• 作者：Behzad Koozegar Kaleji (1)
  Navid Hosseinabadi (2)
  Akira Fujishima (3) (4)
  
• 关键词：Titania thin film ; Sol–gel dip coating ; Co ; dopant ; Photo ; catalytic activity ; Optical properties
• 刊名：Journal of Sol-Gel Science and Technology
• 出版年：2013
• 出版时间：February 2013
• 年：2013
• 卷：65
• 期：2
• 页码：195-203
• 全文大小：657KB
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• 作者单位：Behzad Koozegar Kaleji (1)
  Navid Hosseinabadi (2)
  Akira Fujishima (3) (4)
  
  1. Department of Materials Engineering, Faculty of Engineering, Malayer University, P.O.Box 65719-95863, Malayer, Iran
  2. Department of Materials Engineering, Faculty of Engineering, Tarbiat Modares University, P.O.Box 14115-143, Tehran, Iran
  3. Photo-catalystic Group, Kanagawa Academy of Science and Technology, kanagawa, Japan
  4. Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
  
• ISSN：1573-4846

文摘

In this study, preparation of Sn and Nb co-doped TiO2 dip-coated thin films on glazed porcelain substrates via sol–gel process have been investigated. The effects of co-doping content on the structural, optical, and photo-catalytic properties of applied thin films have been studied by X-ray diffraction (XRD), field emission SEM (FE-SEM), high resolution transmission electron microscopy (HR-TEM), and UV–Vis absorption spectroscopy. Surface chemical state of thin films was examined by atomic X-ray photoelectron spectroscopy (XPS). XRD results suggest that adding impurities has a great effect on the crystallinity and particle size of TiO2. Titania Rutile phase formation in thin film was promoted by Sn4+ addition but was inhibited by Nb5+ doping. The prepared co-doped TiO2 photo-catalyst films showed optical absorption edge in the visible light area and exhibited excellent photo-catalytic ability for degradation of methylene blue (MB) solution under solar irradiation. Comparison with undoped and Sn or Nb-doped TiO2, codoped TiO2 shows an obviously higher catalytic activity under solar irradiation.