Abstract:
The macro-sized macro-mesoporous SiO
2 was prepared by using a pillared epoxy resin macroporous polymer as the template and it was used as support to prepare macro-mesoporous TiO
2 nanocrystalline-SiO
2 composite through an in situ hydrolysis of tetrabutyl titanate and a subsequent calcination at high temperature. The macro-mesoporous TiO
2-SiO
2 samples were characterized by SEM, TEM, XRD, FTIR and N
2 adsorption-desorption. Using azophloxine as a simulated pollutant, the photocatalytic activity of the macro-mesoporous TiO
2-SiO
2 was studied under the sunlight irradiation simulated by Xenon lamp under different conditions. The results show that the macro-mesoporous SiO
2 has 3D continuous pass-through macropore structure and its pore wall is continuous SiO
2 nano-film. TiO
2 nanocrystallines, in the form of nano-film, in situ grow uniformly on both sides of the nano SiO
2 film, and abundant mesopores were observed on the pore wall of the obtained macro-mesoporous TiO
2-SiO
2 composite. The macro-mesoporous TiO
2-SiO
2 photocatalyst exhibits the best activity for photocatalytic degradation of pollutant from the macro-mesoporous TiO
2-SiO
2 composite containing 15.7wt% of TiO
2 calcined at 600℃, under the conditions of azophloxine concentration 10 mgL
-1 and pH of 3. The macro-mesoporous TiO
2-SiO
2 photocatalyst also has good reusability.
点击查看大图
下载:
