Method for manufacturing photocatalytic anatase titanium dioxide powder
AssigneeNano Corp.
InventorsDong-Woo Shin, Bub-Jin Kim
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Abstract
A method for manufacturing an inexpensive and safe titanium dioxide powder having an excellent photocatalytic ability and a high purity of anatase phase crystalline structure by utilizing meta-titanic acid as a starting material is disclosed. Meta-titanic acid is first neutralized by a basic solution, followed by adding a metal oxide. Then, the meta-titanic acid is spray dried using hot air to obtain spherical shape granules. The granules are then sintered to obtain the resulting titanium dioxide powder having small sized porous second particles and a high specific surface area. As a result, an economical and highly effective photocatalytic titanium dioxide powder can be obtained.
Claims14
A method for manufacturing a titanium dioxide powder comprising the steps of:
- adding a metal oxide to meta-titanic acid;
- spray drying the meta-titanic acid having the metal oxide therein with hot air to obtain a powder of granules having a spherical shape;
- and
- sintering the powder to obtain titanium dioxide having an anatase phase crystalline structure.
A method for manufacturing a titanium dioxide powder comprising the steps of:
- removing impurities contained in meta-titanic acid obtained by hydrolysis of TiOSO4 by neutralizing the meta-titanic acid with a basic solution to a pH of about 7-9;
- washing the neutralized meta-titanic acid with distilled water
- adding a metal oxide to the washed meta-titanic acid;
- spray drying the meta-titanic acid having the metal oxide therein with hot air to obtain a powder of granules having a spherical shape;
- and
- sintering the powder to obtain a titanium dioxide having an anatase phase crystalline structure.
Dependencies are inferred from the claim text.