Journal of the Korean Ceramic Society (한국세라믹학회지)

The Korean Ceramic Society (한국세라믹학회)
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Preparation of the Titanium Dioxide-Phosphor Composite and its Photocatalytic Reaction under Visible Light

이산화티타늄-발광체 복합소재 제조 및 가시광선 광촉매 반응

  • Park, Jin-Woo (Department of Materials Science and Engineering, The University of Seoul) ;
  • Kim, Jung-Sik (Department of Materials Science and Engineering, The University of Seoul)
  • 박진우 (서울시립대학교 신소재공학과) ;
  • 김정식 (서울시립대학교 신소재공학과)
  • Published : 2008.11.30
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Abstract

This paper presents a study on the photocatalytic reaction about the composite particles of $TiO_2$-coated phosphors under visible light irradiation. Nanocrystalline titanium dioxide layers were directly coated on the alkaline earth aluminate phosphor, $CaAl_2O_4:Eu^{2+},\;Nd^{3+}$ particles by an sol-gel processing method. The photocatalytic reaction was analyzed with the degradation of methylene blue (MB) aqueous solution under UV and visible light irradiations. $TiO_2$-coated phosphor powders showed different photocatalytic mechanism, compared with pure $TiO_2$ (P-25, Degussa). Under UV-irradiation, $TiO_2$-coated phosphor powders showed slow photocatalytic reactivity in the early stage and fast in the latter, compared with that of pure $TiO_2$. However, $TiO_2$-coated phosphor powders showed much faster photocatalytic reactivity than that of pure $TiO_2$ under visible irradiation. In addition, the characterizations of the $TiO_2$-coated phosphor powders were conducted by a X-ray diffractometer (XRD), transmission electron microscope (TEM), and energy dispersive spectroscopy (EDS).

Keywords

References

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