PRODUCTION METHOD OF TITANIUM DIOXIDE (TiO2) PHOTOCATALYST AND TiO2 PHOTOCATALYST PRODUCED BY THE SAME
First Claim
1. A method for producing a titanium dioxide photocatalyst, the method comprising the steps of:
- (1) adding a solution (“
Solution A”
) containing an acid, water and an organic solvent dropwise to a solution of a titanium alkoxide in an organic solvent with stirring until the pH of the resulting solution is adjusted to 0.5 to 2.0;
(2) reacting the mixed solution with stirring for 12 to 48 hours to form a sol;
(3) adding a basic aqueous solution dropwise at a rate of 0.05 to 0.5 ml/sec to the reaction solution with stirring until the pH of the resulting solution reaches 6.0 to 10.0 to convert the sol to a gel;
(4) drying the gel at 110°
C. for 12 hours, followed by pulverization to obtain a powder; and
(5) calcining the powder at 350 to 800°
C.
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Abstract
A method for producing a titanium dioxide photocatalyst is provided. The method uses a sol-gel process wherein acid and base catalysts are added in two separate steps. According to the method, a titanium dioxide photocatalyst with increased mesoporosity can be produced without the use of any particular additive. Further, an anatase structure is formed upon drying and is maintained even after high-temperature calcination. Further provided is a titanium dioxide photocatalyst produced by the method. Further provided is a titanium dioxide photocatalyst doped with sulfur and zirconium, which is produced by using the method. The doped titanium dioxide photocatalyst exhibits catalytic activity even under visible light and excellent surface characteristics to achieve improved photocatalytic activity.
21 Citations
16 Claims
-
1. A method for producing a titanium dioxide photocatalyst, the method comprising the steps of:
-
(1) adding a solution (“
Solution A”
) containing an acid, water and an organic solvent dropwise to a solution of a titanium alkoxide in an organic solvent with stirring until the pH of the resulting solution is adjusted to 0.5 to 2.0;(2) reacting the mixed solution with stirring for 12 to 48 hours to form a sol; (3) adding a basic aqueous solution dropwise at a rate of 0.05 to 0.5 ml/sec to the reaction solution with stirring until the pH of the resulting solution reaches 6.0 to 10.0 to convert the sol to a gel; (4) drying the gel at 110°
C. for 12 hours, followed by pulverization to obtain a powder; and(5) calcining the powder at 350 to 800°
C. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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- 14. A titanium dioxide photocatalyst doped with sulfur and zirconium.
Specification