Homogeneous titania-silica binary hydrogels were molded into various shapes, microhoneycomb, self-standing bundle, microfibers, and powder, by a unidirectional freezing method. Moreover, by freeze-drying the unidirectionally frozen samples, the honeycomb walls or microfibers obtained were converted into mesoporous cryogels which possessed considerable high surface areas (up to 1057 m2 g- 1) and large mean pore diameters of 2-6 nm. Thanks to the high porosity and well-dispersed titania, the titania-silica binary cryogels exhibited very high photocatalytic activity in the decomposition of salad oil under ultraviolet irradiation.
- Sol-gel preparation
- Template synthesis