Acta Phys. -Chim. Sin. ›› 2005, Vol. 21 ›› Issue (03): 229-233.doi: 10.3866/PKU.WHXB20050301

• ARTICLE •     Next Articles

Preparation and Characterization of Silica-modified Titanium Dioxide Nanoparticles by Co-precipitation Method

LI Zhi-Jie; HOU Bo; XU Yao; WU Dong; SUN Yu-Han   

  1. State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan　030001;　Graduate School of the Chinese Academy of Sciences, Beijing　100039
  • Received:2004-07-04 Revised:2004-09-07 Published:2005-03-15
  • Contact: SUN Yu-Han E-mail:yhsun@sxice.ac.cn

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Abstract: Silica-modified titanium dioxides were prepared by co-precipitation method and then characterized by XRD, FT-IR, XPS, TEM, and UV-Vis absorption spectroscopy. The results showed that there was a strong interaction between SiO2 and SiO2, and Ti－O－Si bonds formed on silica-modified titanium dioxide surfaces. The addition of silica in SiO2 particle could effectively suppress the formation of rutile phase, the decrease of surface area and the growth of titanium dioxide crystals. The band-gap transition increased with the increase of silica content. In comparison with pure SiO2 nanoparticles, the silica-modified SiO2 nanoparticles exhibited better photocatalytic activity, and the activity increased with the silica content.

Key words: Titanium dioxide nanoparticles, Silica, Co-precipitation, 　Photocatalytic