Journal of Korean Society for Atmospheric Environment

Korean Society for Atmospheric Environment (한국대기환경학회)
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Photocatalytic Decomposition of Gaseous Ozone over $TiO_2$Thin Film

  • Cho, Ki-Chul (Department of Environmental Science, DongNam Health College) ;
  • Hwang, Kyung-Chul (Department of Environmental Science, DongNam Health College) ;
  • Yeo, Hyun-Gu (Department of Environmental Engineering, Konkuk University Seoul) ;
  • Taizo Sano (National Institute of Advanced Industrial Science and Technology, Institute for Environmental Management Technology, Photoenergy Application Group, AIST Tsukuba West) ;
  • Koji Takeuchi (National Institute of Advanced Industrial Science and Technology, Institute for Environmental Management Technology, Photoenergy Application Group, AIST Tsukuba West) ;
  • Sadao Matsuzawa (National Institute of Advanced Industrial Science and Technology, Institute for Environmental Management Technology, Photoenergy Application Group, AIST Tsukuba West)
  • Published : 2003.09.01
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Abstract

The characteristics of heterogeneous photocatalytic decomposition were investigated at low concentration level of $O_3$on TiO$_2$for various operating parameters such as: loaded catalyst weight (0∼4 mg/$\textrm{cm}^2$), initial concentration of $O_3$(0.06∼10.0 ppm), gas flow rate (1.0 ∼ 2.5ι/min), and relative humidity (0∼80%). This study was conducted using a flow-type reactor at room temperature. Three kinds of pure TiO$_2$(P25, ST -01, and E- 23) were employed as photocatalyts. It was found that $O_3$removal ratio was identical, regardless of the loaded TiO$_2$weight in the range from 0.5 to 4.0 mg/$\textrm{cm}^2$. It was also found that higher initial ozone concentration results in greater oxidation rate of ozone and experimental data show kinetically a good agreement with Langmur-Hinshelwood kinetic model. We also observed that the removal ratio of $O_3$increases linearly with the increasing flow rate and also with the increasing relative humidity for each catalyst.

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References

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