| 초록 |
Among various kinds of waste water treatments, photocatlysis is environmetally friendly, becuase it requires sunlight only without any other oxidants which could also contaminate environments. In order to apply photocatalysis to the water treatment processes, photocatalysts should degrade most of organic wastes in the early stage. Obtaining nano-propping effect by impregnated WOx in pores increased pore structure stability during annealing for high crystallinity of TiO2 at high temperature. Amorphous WOx and TiO2 would form a type II heterojunction, and it allows the excited electrons from TiO2 to transfer to WOx, and holes in the opposite way. Therefore, WOx-TiO2 composite would be effective heterostructured materials for photocatalysis in the early reaction stage. In this study, amorphous WOx was promoted (or impregnated) on mesoporous TiO2 via incipient wetness-impregnation method, and annealed at different temperatures up to 700 oC. Photocatalytic activities of prepared materials are evaluated with model dyes under UV light. The initial photocatalytic activity was calculated by pseudo-1st order kinetic model during initial 1 h. |
