| Title |
Synthesis and Visible Light Photocatalytic Activity of Porous TiO2-80wt.%CeO2 Composite Powders |
| Authors |
최성민(Sung Min Choi); 홍원석(Won Seok Hong); 최성창(Sung Chang Choi); 한재길(Jae Kil Han) |
| ISSN |
1738-8228(ISSN), 2288-8241(eISSN) |
| Keywords |
nanoparticle; photoactivity; porous powder; sol-gel method |
| 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. |