文献类型：期刊文献

英文题名：Structure and properties of porous SiO₂-TiO₂ blocks

作者：Wang, XQ; Chen, Q; Song, L; Li, HP; Lu, JY

机构：[1]E China Univ Sci & Technol, Dept Inorgan Mat, Shanghai 200237, Peoples R China

年份：2006

卷号：21

期号：1

起止页码：181

外文期刊名：JOURNAL OF INORGANIC MATERIALS

收录：;WOS:【SCI-EXPANDED(收录号:WOS:000235420900030)】；

语种：英文

外文关键词：sol-gel process; organic-inorganic hybrid; porous SiO2-TiO2; chemical durability

摘要：Porous SiO2-TiO2 blocks were successfully synthesized by polymerization of tetraethyoxysilane and tetrabutyl titanate in the presence of polyethylene glycol via a sol-gel route. Their infrared spectra, pore distribution and chemical durability were mainly studied. The results showed that the residual organic component can be removed after heat-treated at 500 degrees C for 2h, and then a vitreous structure with Si-O and Ti-O bonds was formed. The porous materials containing Ti had a narrower pore distribution and the peak of the pore distribution curve shifted to the smaller pore diameter. With the increase of TiO2 content, the density of porous blocks increased, whereas open porosity and adsorbed water ratio decreased at the same time. After immersion in water at 80 degrees C for 72h, the type and shape of adsorption-desorption curves changed slightly. Since the change of specific surface area, pore volume and average pore diameter for the obtained materials decreased with the increase of Ti content, it indicated an improvement of water resistance. The durability of porous blocks in 1% NaOH basic solutions at 95 degrees C was apparently improved due to an addition of titanium as compared with SiO2 porous block which was collapsed in such solution. However, anti-acid resistance of porous materials in 20% H2SO4 solutions at 98 degrees C can not be improved by an addition of titanium.