Preparation of Titanium oxide Nanocrystalline Powder at Low Temperature

摘要

PURPOSE: Provided is a method for producing titanium oxide powder by conducting low heat treatment such as treating with boiling water or acid excluding heat treatment at high temperature. The titanium oxide powder has excellent crystallinity at relatively low temperature and high specific surface area. Therefore, it is possible to reduce the re-bonding rate of electron-positive hole which decrease the photo-catalyst activity, and to stimulate the photo-catalyst activity due to its broadened reaction area. CONSTITUTION: A method for producing TiO2 powder having nano-size particle is characteristically including the steps of: reacting amorphous titanium hydroxide precipitate obtained from a reaction between 0.5M of TiOCl2 solution and 0.5M of ammonia solution with 5M of NaOH aqueous solution; and performing a boiling water treatment or acid treatment to mixture of gamma-Na2TiO3 and anatase phase, using HCl at 60 deg.C, to elute all of the Na elements that are contained in the gamma-Na2TiO3 and to form TiO2 nano-size particles having excellent crystallinity and high specific surface area.