Korean Journal of Materials Research (한국재료학회지)

Materials Research Society of Korea (한국재료학회)
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Effect of Adding WO3 on Photocatalytic Property of TiO2 Coated Coal Fly Ash

WO3 피복 석탄회의 광촉매 특성에 미치는 TiO2의 첨가 효과

  • Yu, Yeon-tae (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources) ;
  • Kim, Byoung-gyu (Minerals and Materials Processing Division, Korea Institute of Geoscience and Mineral Resources)
  • 유연태 (한국지질자원연구원 자원활용소재연구부) ;
  • 김병규 (한국지질자원연구원 자원활용소재연구부)
  • Published : 2003.10.01
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Abstract

To improve the photocatalyticactivity of $TiO_2$-coated coal fly ash, tungsten hydroxide was doped by impregnation method and was oxidized by heat treatment in temperature ranges of $WO^{\circ}C$ for 2 hrs. The changes of crystal structure and crystal size of $TiO_2$and $WO_3$on coal fly ash were investigated by X-ray diffraction analysis. The crystal structure of titanium dioxide showed only anatase type and $TiO_2$-$WO_3$ compounds appeared in the heat treatment temperature ranges of $500∼600^{\circ}C$. By adding $V_3$in $TiO_2$coated on fly ash, the growth of crystal size of anatase was restrained and the anatase phase was stabilized in temperature ranges of TEX>$500∼<800^{\circ}C$. And $WO_3$acted as a trap site of electrons excited from anatase by irradiating UV. The maximum removal efficiency of NO gas for $TiO_2$/$WO_3$-coated coal fly ash was 84% and appeared when the ammonium tungstate of $1.3${\times}$10^{-3}$ M was doped and then heated at $600^{\circ}C$ for 2 hrs.

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References

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