Investigation of photocatalytic reaction for thetitanium dioxide-phosphor composite |
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Authors: | Jin-Ho Yoon and Jung-Sik Kim |
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Institution: | (1) Department of Materials Science and Engineering, The University of Seoul, Seoul, 130-743, Korea; |
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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. |
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