Acta Phys. -Chim. Sin. ›› 2009, Vol. 25 ›› Issue (08): 1511-1516.doi: 10.3866/PKU.WHXB20090730

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Preparation of Spherical TiO2 and Kinetics of Its Hydrolysis Process

HU Mei-Long, XU Sheng-Ming, BAI Chen-Guang, XU Gang, LV Xue-Wei   

  1. College of Material Science and Engineering, Chongqing University, Chongqing 400030, P. R. China|Institute of Nuclear and New Energy Technology, Tsinghua University, Beijing 100084, P. R. China
  • Received:2008-12-15 Revised:2009-04-06 Published:2009-07-16
  • Contact: XU Sheng-Ming, BAI Chen-Guang E-mail:smxu@tsinghua.edu.cn; bguang@cqu.edu.cn

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Abstract:

Spherical titania was prepared by a hydrolysis method of titanium sulfate as the precursor. The effects of the precursor concentration and temperature on the hydrolysis rate were discussed. Results showed that an exponential relationship existed between the mass fraction of titania and hydrolysis time. These results were confirmed by the Avrami equation. The effect of the medium on the hydrolysis rate was also discussed. The hydrolysis rate could be controlled by adjusting the dielectric constant and the zeta potential. By analysis of the preparation procedure of the spherical titania and the kinetics thereof, we conclude that a low precursor concentration, high hydrolysis temperature, and adaptive medium are the key points for the preparation of high quality titania with narrow particle size distribution and good dispersibility.

Key words: Titaniumsulfate, Hydrolysis, Preparation, Spherical titania, Kinetics