| 초록 |
N-TiO2 nanopowder and TiO2 nanotube photocatalysts were synthesized by the sol-gel and alkaline hydrothermal methods, respectively. These catalysts were doped with transition metal (M= Pt, Cu, Cr, Fe) using different doping and treatment methods such as impregnation and H2 reduction, impregnation and NaBH4 reduction, and direct assembly. The crystalline structure and morphology of the prepared catalysts were characterized by XRD, FE-SEM, TEM. Band-gap and light absorbance were measured by UV-Vis-DRS. The prepared photocatalysts were used for decomposition of methylene blue (liquid phase) and acetone (gas phase). A photo-reactor was equipped with 4 BLB lamps (40 W) and 4 fluorescent lamps (80 W). UV-VIS spectrometer and gas chromatography were used for analysis of the products of the photo-decomposition reaction. In the photo-decomposition of methylene blue, M-N-TiO2 nanopowders prepared by the impregnation and NaBH4 reduction method showed twofold higher photoactivity under ultraviolet-A than the other catalysts which prepared by other methods, also showed outstanding photoactivity under visible light but the other ones prepared by other methods showed poor activity. |
