Abstract
The present study examined the photocatalytic reaction of titanium dioxide (TiO2)-coated, phosphor composite particles. Nanocrystalline TiO2 layers were directly coated on the alkaline earth aluminate phosphor (CaAl2O4:Eu2+,Nd3+) particles by a sol-gel processing method and their photocatalytic reaction was analyzed according to the degradation of methylene blue aqueous solution under visible light irradiation. Compared with pure TiO2, the TiO2-coated phosphor powders showed a different photocatalytic mechanism and much faster photocatalytic reactivity under visible irradiation than that of pure TiO2, which was almost negligible. The mechanism of the photocatalytic reactivity for the TiO2-phosphor composite was discussed in terms of the energy band structure and phosphorescence. In addition, the TiO2-coated phosphor powders were characterized by X-ray diffraction and transmission electron microscopy.
Original language | English |
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Pages (from-to) | 131-135 |
Number of pages | 5 |
Journal | Ionics |
Volume | 16 |
Issue number | 2 |
DOIs | |
State | Published - Mar 2010 |
Keywords
- Phosphor
- Photocatalyst
- Sol-gel process
- Titanium dioxide