Tio2 ultrafine powder, and process for preparing thereof

Abstract

The present invention relates to titanium dioxide powder with a large specific surface area, a method for preparing thereof, and a use of the titanium dioxide as a photocatalyst, and more particularly, discloses a method for the preparation of titanium dioxide powder comprised of the steps of adding ice pieces or icy distilled water to pure titanium tetrachloride (TiCl ) to give an aqueous titanylchloride solution of 1.5 M or higher; diluting the aqueous titanylchloride with distilled water; obtaining precipitates from the diluted aqueous titanylchloride solution by standing for 2-20 hours at 15-70° C.; and filtering, washing and drying the above precipitates to give downy hair-shaped TiO powder with a specific surface area of 130-200 m /g. The titanium dioxide powder of the present invention shows high photocatalytic activity, so that it can be used to decompose environmental organic pollutants by taking advantage of an advanced oxidation process (AOP) in which pollution-free energy, such as solar energy is utilized as a driving force. The method allows the formation of a crystalline phase of titanium dioxide at room temperature without a high temperature and high pressure process and enjoys an economical advantage of being low in production cost.