| 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 |
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| ABSTRACT |
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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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