| 초록 |
Nanostructured TiO2 would have large surface area with high pore volumes, which is adequate for adsorbing plenty amount of organic dyes (or pollutants) in water and air. Also, TiO2 is well-known as a highly reactive photocatalyst under UV light irradiation. For faster photocatalysis process, TiO2 should be improved its light-harvesting ability, and charge transfer ability to generate reactive oxygen species. Here, other metal oxide (WOx and FeOx)–incorporated mesoporous TiO2 were prepared via hard-template method using (1) titanium glycolate spheres and (2) KIT-6 (Ia3d mesostructure). (1) WOx-incorporated mesoporous TiO2 showed faster photocatalytic degradation rate than mesoporous TiO2 exhibited. This phenomenon would be explained its larger surface area, and higher crystallinity of anatase phase. (2) Ordered mesoporous Fe2O3-TiO2 nanocomposites decomposed organic dyes effectively under both UV and visible lights. The heterojunctions between Fe2O3 and TiO2 nanoparticles would help excitons easily separated into the conduction and valence band, thus, reactive oxygen species could be generated without difficulty. |
