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Citation: LI Zhi-Jie, HOU Bo, XU Yao, WU Dong, SUN Yu-Han. Preparation and Characterization of Silica-modified Titanium Dioxide Nanoparticles by Co-precipitation Method[J]. Acta Physico-Chimica Sinica, ;2005, 21(03): 229-233. doi: 10.3866/PKU.WHXB20050301 shu

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

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 Date: 4 July 2004
Available Online: 15 March 2005

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.
- Titanium dioxide nanoparticles; Silica; Co-precipitation;　Photocatalytic
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