Technical and Structure Study of Coprecipitation Method for Nano-Titanium Dioxide

摘要

Nano-titanium dioxide (N-TiO_2) have already been studied and applied in the different fields due to its special surface, quantum size effect and high photocatalysis etc super properties. As a kind of biomaterials, biocompatibility and corrosion resistant of titanium are closely related to the surface oxide films. In this paper, nano-titanium dioxide with uniform granularity was synthesized using coprecipitation method. The effects of reactant mixture ratio and sintering temperature on synthesized N-TiO_2 were discussed. X-ray diffraction and Fourier transform infrared spectroscopy were employed to analyze structure of N-TiO_2. The results showed that prepared N- TiO_2 were all anatase and rutile coexistence and the larger ratio of carbamide to titanium oxysulfate (CO(NH_2)_2/TiOSO_4) is propitious to formation of metatitanic acid (TiO(OH)_2) precipitate. Meanwhile, with CO(NH_2)_2/TiOSO_4 increasing, the start time and end time of precipitate decreased. The method used in this paper was a kind of simple process and easy to do.