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US 7,255,847 B2Granted
Method for making single-phase anatase titanium oxide
AssigneeThe Hong Kong Polytechnic University
InventorsWalid Abdelhamid Daoud, John Haozhong Xin, Kaihong Qi
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Abstract
This invention relates to methods of making single phase nanocrystalline titanium dioxide. It is hereby provided a method for preparing single-phase anatase type titanium dioxide photocatalyst having a particle size of nano level at near room temperatures without the need for a sintering process at high temperatures.
Claims12
A method for preparing single-phase anatase type titanium dioxide having a particle size of nano level, comprising:
- adding a titanium-based starting material to a selected solvent containing an acid or base catalyst and an organic acid;
- subjecting the resulting solution to heat treatment at between 35 and 50° C. to activate crystallization and thereby obtaining a single-phase anatase type titanium dioxide sol solution;
- and coating the single-phase anatase type titanium dioxide sol solution onto an article or isolating the single-phase anatase solids from the solution by precipitation.
Dependencies are inferred from the claim text.