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US 2012/0058887 A1Published application
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.
Claims15
1-16. (canceled)
A method for preparing an article coated with single-phase anatase titanium dioxide having a nano level particle size, comprising:
- adding a titanium-based starting material to a solvent containing at least water and an organic acid;
- subjecting the resulting solution to heat treatment at a temperature of between 35 and 58° C. to activate crystallization and thereby obtaining a single-phase anatase titanium dioxide sol solution, coating the article with the single-phase anatase titanium dioxide sol solution, and drying the coated article at a temperature between 35 and 58° C.
A method of treating an article with single-phase anatase titanium dioxide having a nano level particle size;
- comprising
- preparing a single-phase anatase titanium dioxide sol solution by adding a titanium-based starting material to a solvent containing water and an acid or base catalyst and an organic acid;
- subjecting the resulting solution to heat treatment at a temperature of between 35 and 58° C. to activate crystallization and thereby obtaining a single-phase anatase titanium dioxide sol solution;
- coating the single-phase anatase titanium dioxide sol solution onto an article or isolating the single-phase anatase solids from the solution by precipitation;
- and
- drying the coated article at a temperature between 35 and 58° C.
3 more elements
Dependencies are inferred from the claim text.