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Vol.45, No.11, 639 ~ 644, 2007
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| Title |
| Synthesis and Visible Light Photocatalytic Activity of Porous TiO2-80wt.%CeO2 Composite Powders |
| 최성민 Sung Min Choi , 홍원석 Won Seok Hong , 최성창 Sung Chang Choi , 한재길 Jae Kil Han |
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| Abstract |
| Nano-sized TiO2-CeO2 porous powders were synthesized by a sol-gel process using titanium iso-propoxide and Ce(NO3)3·6H20 as precursors. The particle size of as-received TiO2-CeO2 porous powders were measured range from 50 nm to 1.5μm by TEM. The as-received TiO2-CeO2 porous powders in an amorphous phase were crystallized with CeO2 at around 750℃. As the calcination temperatures increased, the amorphous TiO2 phase was transformed to anatase TiO2 at about 900℃ and the small amount of rutile TiO2 phase was also detected. The peaks obtained after calcining at 1,050℃ were mainly exhibited the rutile TiO2 and CeO2 phases. For the comparison of photocatalytic activity, TiO2-80wt.%CeO2 porous powder calcined at 900℃ showed an excellent efficiency for the removal phenol under UV light irradiation. However, TiO2-80wt.%Ce02 porous powder calcined at 600℃ showed a relatively higher visible absorption ability than other powders. TiO2-80wt.%CeO2 porous powders showed a relatively lower photoactivity efficiency under visible light irradiation compared with UV light irradiation. |
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| Key Words |
| nanoparticle, photoactivity, porous powder, sol-gel method |
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