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J. Korean Ceram. Soc. > Volume 45(11); 2008 > Article
Journal of the Korean Ceramic Society 2008;45(11): 688.
doi: https://doi.org/10.4191/kcers.2008.45.1.688
이산화티타늄-발광체 복합소재 제조 및 가시광선 광촉매 반응
박진우, 김정식
서울시립대학교 신소재공학과
Preparation of the Titanium Dioxide-Phosphor Composite and its Photocatalytic Reaction under Visible Light
Jin-Woo Park, Jung-Sik Kim
Department of Materials Science and Engineering, The University of Seoul
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).
Key words: Titanium dioxide, Sol-gel processing, Photocatalyst, Phosphor, Ceramic composite
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