Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation and Photocatalytic Effect of Brookite Phase TiO2 Colloidal Sol for Thin Film Coating

Brookite TiO2 코팅용 졸의 제조 및 광촉매 효과

  • Kim, Sun-Jae (Department of Nano Science and Technology/SAINT, Sejong University) ;
  • Lee, Nam-Hee (Department of Nano Science and Technology/SAINT, Sejong University) ;
  • Lee, Kang (Department of Nano Science and Technology/SAINT, Sejong University) ;
  • Choi, Chang-Joo (Department of Electrical Engineering Chosun University)
  • 김선재 (세종대학교 나노공학과/나노신소재공학연구소) ;
  • 이남희 (세종대학교 나노공학과/나노신소재공학연구소) ;
  • 이강 (세종대학교 나노공학과/나노신소재공학연구소) ;
  • 최창주 (조선대학교 전기공학과)
  • Published : 2005.07.01
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Abstract

Transparent TiO$_{2}$ sols were prepared by hydrothermal synthesis to heat Ti precursor solutions, from Ti hydroxides obtained with neutralizing aqueous TiOCl$_{2}$ solutions having various concentrations of NaCI by aqueous NaOH solution, in the autoclave at 120$^{\circ}C$ The photocatalytic abilities of glass beads coated with the sol for gaseous benzene were evaluated. As a result, it was found that due to the increase of brookite phase in TiO$_{2}$ by controlling the concentration of Na ion the optical absorption of TiO$_{2}$ increases toward long wavelength but that in the area of short wavelength becomes relatively low and consequently the photocatalytic performance of TiO$_{2}$ thin film for benzene gas rather decreases, compared to that of composite film of anatase and brookite phases. These results suggest that in order for coated TiO$_{2}$ thin film to have high dissociation performance for benzene gas it is effective to form anatase and brookite phases compositely in TiO$_{2}$.

Keywords

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