Preparation of Nanopowders TiO2 by Hydrolysis-Precipitation of Titanium Alkoxide

TiO2 nanopowders were prepared by hydrolysis-precipitation of titanium alkoxide method with [Ti(C4H9O)(4)] as precursor. The powders were characterized by specific surface area analysis, X-ray diffraction (XRD), Fourier transform infrared spectrum (FTIR), scanning electron microscopy (SEM) and Delsa NanoC particle analyzer. The effect of raw materials ratio and pH value on particle size was discussed in detail. The result reveals a phase transformation from anatase to rutile in the range of 600-800 degrees C. The major phase exists as rutile at 800 degrees C, and the powder is uniform and spherical. The optimum synthesis conditions for TiO2 powders are listed as follows: n(H2O):n[Ti(C4H9O)(4)] of 30, pH value of 3.03, calcinations temperature of 400 degrees C, and reaction time of 2 h in the air. The resultant powder has an average crystal grain size of 80 nm, mean diameter of 580 nm, and surface area of 117.2631 m(2)/g.