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Titanium hydroxide and optical catalyst therefrom and coating agent containing the same

A technology of titanium hydroxide and atomic spacing, applied in the direction of physical/chemical process catalysts, titanium dioxide, titanium oxide/hydroxide, etc., can solve the problems of inability to show, high photocatalytic activity, etc.

Inactive Publication Date: 2002-07-31
SUMITOMO CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still some problems in this method, so that the photocatalysts obtained from commercially available titanium hydroxide calcined cannot exhibit sufficiently high photocatalytic activity when irradiated with visible light.

Method used

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  • Titanium hydroxide and optical catalyst therefrom and coating agent containing the same
  • Titanium hydroxide and optical catalyst therefrom and coating agent containing the same
  • Titanium hydroxide and optical catalyst therefrom and coating agent containing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] In a 1 liter flask, 214 g of water, 120 g of titanium oxysulfate (manufactured by SOEKAWA CHEMICAL CO., LTD.) were added and mixed with each other under stirring to obtain a solution. From the resulting solution, water was evaporated in an evaporator at 70 °C to obtain TiOSO 4 A mixture with a concentration of 62.5% by weight. The mixture was placed in a flask. Into the flask, 907 g of a 25% by weight aqueous ammonia solution (special grade, manufactured by Wako Pure Chemical Industries, Ltd.) was added dropwise over 10 seconds while cooling at -30°C with a coolant, thereby precipitating a solid. The solid was separated from the mixture by filtration, washed with water and dried at 70°C to yield titanium hydroxide.

[0050] Obtain the radial structure function and its first order differential spectrum of this titanium hydroxide, see respectively figure 2 and 3 .

[0051] The atomic distances corresponding to the maximum or minimum intensity observed in the first-o...

Embodiment 2

[0054] In a 300 ml liter flask, 60 g of water, 90 g of titanium oxysulfate (manufactured by SOEKAWAHEMICAL CO., LTD.) were added and mixed with each other under stirring to obtain a solution. From the resulting solution, water was evaporated in an evaporator at 70 °C to obtain TiOSO 4 A mixture with a concentration of 59.2% by weight. The mixture was placed in a flask. 414 g of a 25% by weight aqueous ammonia solution (special grade, manufactured by Wako Pure Chemical Industries, Ltd.) was dropped into the flask over 8 seconds while cooling at -30°C with a coolant, thereby precipitating a solid. The solid was separated from the mixture by filtration, washed with water and dried at 70°C to yield titanium hydroxide.

[0055] Obtain the radial structure function and its first order differential spectrum of this titanium hydroxide, see respectively Figure 4 and 5 .

[0056] The atomic distances corresponding to the maximum or minimum intensity observed in the first-order dif...

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Abstract

A titanium hydroxide is provided which can be utilized for producing a photocatalyst exhibiting a superior photocatalytic activity by irradiation of visible light. The titanium hydroxide has a primary differential spectrum (of radial structure function in connection with titanium K absorption edge) having maximal intensities (U1 and U2) and minimal intensities (L1 and L2) at interatomic distances in the range of from 1.4 ANGSTROM to 2.8 ANGSTROM , the maximal intensities being at an interatomic distance of from 1.4 ANGSTROM to 1.7 ANGSTROM and of from 2.2 ANGSTROM to 2.5 ANGSTROM and the minimal intensities being at an interatomic distance of from 1.9 ANGSTROM to 2.2 ANGSTROM and of from 2.5 ANGSTROM to 2.8 ANGSTROM ; and index X calculated by the equation X = (U2-L2) / (U1-L1) of about 0.06 or more.

Description

technical field [0001] The present invention relates to titanium hydroxide, a photocatalyst obtained from titanium hydroxide and a coating agent containing titanium hydroxide. Background technique [0002] Studies have shown that organic matter in water or NO in air x It decomposes and is removed under the photocatalytic activity of photocatalysts such as special titanium oxide. Currently, the use of visible light as a light source to decompose and remove such substances has attracted the attention of researchers in terms of general purpose and use, and it is desired to develop a photocatalyst with excellent photocatalytic activity under visible light irradiation. [0003] Until now, titanium oxide, which can be used as a photocatalyst, has been prepared by calcining commercially available titanium hydroxide. However, there are still some problems in this method, so that the photocatalyst obtained from commercially available titanium hydroxide calcined cannot show a suffic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G23/08B01J21/06B01J35/00C01G23/04C01G23/053C09D1/00
CPCC01P2002/77C01G23/04C01G23/0532C01P2002/74B01J35/39
Inventor 酒谷能彰安东博幸小池宏信
Owner SUMITOMO CHEM CO LTD