Journal of Powder Materials (한국분말재료학회지)

The Korean Powder Metallurgy & Materials Institute (한국분말재료학회 (*구 분말야금학회))
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Preparation of WO3-TiO2 Photocatalyst and Evaluation of Its Photo-activity in the Visible Light Range

가시광 활성 WO3-TiO2 복합체 광촉매의 제조 및 이의 특성 평가

  • Yeo, In-Chul (Department of Mechanical Engineering, Incheon University) ;
  • Kang, In-Cheol (Technology Convergence Center, IncheonTechnopark)
  • 여인철 (인천대학교, 기계시스템 공학부) ;
  • 강인철 ((재)인천테크노파크, 융복합산업지원센터)
  • Received : 2013.12.02
  • Accepted : 2013.12.16
  • Published : 2013.12.28
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Abstract

The most general photocatalyst, $TiO_2$ and $WO_3$, are acknowledged to be ineffective in range of visible light. Therefore, many efforts have been directed at improving their activity such as: band-gap narrowing with non-metal element doping and making composites with high specific surface area to effectively separate electrons and holes. In this paper, the method was introduced to prepare a photo-active catalyst to visible irradiation by making a mixture with $TiO_2$ and $WO_3$. In the $TiO_2-WO_3$ composite, $WO_3$ absorbs visible light creating excited electrons and holes while some of the excited electrons move to $TiO_2$ and the holes remain in $WO_3$. This charge separation reduces electron-hole recombination resulting in an enhancement of photocatalytic activity. Added Ag plays the role of electron acceptor, retarding the recombination rate of excited electrons and holes. In making a mixture of $TiO_2-WO_3$ composite, the mixing route affects the photocatalytic activity. The planetary ball-mill method is more effective than magnetic stirring route, owing to a more effective dispersion of aggregated powders. The volume ratio of $TiO_2(4)$ and $WO_3(6)$ shows the most effective photocatalytic activity in the range of visible light in the view point of effective separation of electrons and holes.

Keywords

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