Photocatalytic Oxidation of Nitrogen Dioxide with TiO<sub>2</sub> Thin Films under Continuous UV-Light Illumination

DOI Web Site 被引用文献1件
  • Yoshihisa Ohko
    Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba, Ibaraki 305-8569, Japan
  • Yuri Nakamura
    Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba, Ibaraki 305-8569, Japan
  • Akari Fukuda
    Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba, Ibaraki 305-8569, Japan
  • Sadao Matsuzawa
    Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba, Ibaraki 305-8569, Japan
  • Koji Takeuchi
    Research Institute for Environmental Management Technology, National Institute of Advanced Industrial Science and Technology (AIST), 16-1, Onogawa, Tsukuba, Ibaraki 305-8569, Japan

書誌事項

公開日
2008-06-21
DOI
  • 10.1021/jp802959c
公開者
American Chemical Society (ACS)

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説明

A deactivating behavior of TiO 2 photocatalysts in NO 2 oxidation to HNO 3 was studied with use of TiO 2 nanoparticulate thin films (0.5-1.5 μm thick) under UV light illumination over 10 h. The photocatalytic activity was decreased with accumulation of HNO 3 on the TiO 2 surface. For thicker TiO 2 films, the deactivation rate was found to be slower. The amount of HNO 3 trapped on the TiO 2 surface was increased and finally saturated, at which the largest amount of HNO 3 was proportional to the thickness of the film. On the basis of the results, we concluded that the produced HNO 3 , inhibiting the reaction as a physical barrier, must be able to diffuse on the TiO 2 surface at a rate of at least more than 1.5 μm h -1 , and finally distributes homogeneously on the whole film. The maximum density of HNO 3 accumulated on the TiO 2 surface was estimated to be ∼2 molecules nm -2 under standard conditions. Finally, when the steady state is reached, the photocatalytic activity remained ∼8% of the initial one.

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