| 초록 |
Titania sols were prepared by acid hydrolysis of a TiCl4 precursor instead of titanium alkoxides. The surfactant solution were used for highly dispersion. The effect of acid concentration on the particle size and stability of sol was investigated. Stable titania sols with nano size could be obtained when the H+/Ti molar ratio was 0.5 . The titania sols were modified with SiO2 to increase catalytic properties, which were used for photocatalytic reaction at room temperature. The titania-silica mixed sols were characterized by XRD, SEM, TEM, BET and so on. Comparing with pure TiO2, the addition of silica increased the photocatalytic activity. SiO2 -TiO2 catalyst showed the highly activity on the photocatalytic degradation of organic compounds. |
