| 초록 |
TiO2 is one of the most widely used photocatalysts owing to its light-harvesting ability and non-toxicity. However, applications of TiO2 have restricted under UV region. To improve the light adsorption, mesoporous TiO2 catalysts were synthesized by soft-template assisted hydrothermal method. The prepared TiO2 catalysts were calcined at different temperatures in the range of 100-1300 ℃ to investigate how their crystalline phases, specific surface area, and band gap energies affect their photocatalytic performance. TiO2 existed in the anatase phase until 700 ℃ and anatase-to-rutile phase transformation occurred at above 700 ℃. The band gap energies gradually decreased with the increase in the calcination temperature. We demonstrate that TiO2 calcined at 1100 ℃ was the highest degradation of methyl violet 2B under visible light irradiation despite of its lower surface area and porosity. |
