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Photocatalytic degradation of methylene blue by Au-deposited TiO2 film under UV irradiation

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Abstract

A TiO2 photocatalytic film was prepared by the sol–gel and dip-coating methods. Au-loaded TiO2 photocatalytic films were produced by the photodeposition method. The photocatalytic activity of the films under UV irradiation was evaluated by measuring the degradation of absorbance for a methylene blue (MB) aqueous solution. Au particles deposited on the TiO2 film improved the photocatalytic activity under the O2 bubbling condition. On the other hand, under N2 or Ar bubbling, the doubly reduced form of MB, leuco-methylene blue (LMB), was formed at the beginning of UV irradiation, and then both MB and LMB were decomposed gradually by the photocatalytic reaction. In this process, Au particles on the TiO2 film behave as electron traps.

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Acknowledgements

This study is supported by the Nishio Scholarship. We also thank Dr. Hashishin, Department of Applied Chemistry, College of Life Sciences, Ritsumeikan University, for discussion in respect of TEM analysis.

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Authors and Affiliations

  1. Department of Applied Chemistry, Faculty of Science and Engineering, Ritsumeikan University, 1-1-1 Noji-higashi, Kusatsu, Shiga, 525-8577, Japan

    Chihiro Yogi, Kazuo Kojima & Tomoo Takai

  2. Department of Materials Science and Engineering, Suzuka National College of Technology, Shiroko, Suzuka, Mie, 510-0294, Japan

    Noriyuki Wada

Authors
  1. Chihiro Yogi
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  2. Kazuo Kojima
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  3. Tomoo Takai
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  4. Noriyuki Wada
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Correspondence to Kazuo Kojima.

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Yogi, C., Kojima, K., Takai, T. et al. Photocatalytic degradation of methylene blue by Au-deposited TiO2 film under UV irradiation. J Mater Sci 44, 821–827 (2009). https://doi.org/10.1007/s10853-008-3151-7

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  • DOI: https://doi.org/10.1007/s10853-008-3151-7

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