Abstract
This paper presents a study on the photocatalytic reaction about the composite particles of TiO2-coated phosphors under visible light irradiation. Nanocrystalline titanium dioxide layers were directly coated on the alkaline earth aluminate phosphor, CaAl2O4 : Eu 2,Nd3+ 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 TiO2 (P-25, Degussa). Under UV-irradiation, TiO2-coated phosphor powders showed slow photocatalytic reactivity in the early stage and fast in the latter, compared with that of pure TiO 2. However, TiO2-coated phosphor powders showed much faster photocatalytic reactivity than that of pure TiO2 under visible irradiation. In addition, the characterizations of the TiO2-coated phosphor powders were conducted by a X-ray diffractometer (XRD), transmission electron microscope (TEM), and energy dispersive spectroscopy (EDS).
Original language | English |
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Pages (from-to) | 688-693 |
Number of pages | 6 |
Journal | Journal of the Korean Ceramic Society |
Volume | 45 |
Issue number | 11 |
DOIs | |
State | Published - Nov 2008 |
Keywords
- Ceramic composite
- Phosphor
- Photocatalyst
- Sol-gel processing
- Titanium dioxide