The average size of titania decreased from 38.4 nm in pure TiO2 to 3.9 nm in SiO2/TiO2 with a SiO2/TiO2 molar ratio of 2/1. In addition, the photocatalytic activity decreased with the increase of rutile content.

• 在纳米TiO2中复合SiO2能有效抑制锐钛矿向金红石的转变；增加锐钛矿的稳定性；并阻止TiO2晶粒的聚集生长.