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Method for producing titanium oxide, photocatalytically active mixture, method for forming titanium oxide film utilizing them, method for producing article coated with titanium oxide and article coate

A film-forming method and technology of titanium oxide film, applied in the directions of titanium oxide/hydroxide, physical/chemical process catalyst, titanium compound, etc., can solve the cost of extra titanium oxide manufacturing, waste titanium oxide, and titanium oxide can not be photocatalyst function and other issues, to achieve the effect of seeking manufacturing costs

Inactive Publication Date: 2007-01-03
SHIKOKU RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0021] However, in the method for forming a titanium oxide film disclosed in Patent Document 1, only the titanium oxide particles exposed on the surface of the film-forming object irradiated with light act as photocatalysts, while the oxide particles buried in cement Titanium does not act as a photocatalyst
[0022] In addition, in the method of forming a titanium oxide film containing a titanium oxide slurry disclosed in Patent Document 2, there is also the following problem: the titanium oxide present inside the titanium oxide particle does not act as a photocatalyst, so a part of the titanium oxide is wasted.
In addition, there is a problem that it is difficult to form a titanium oxide coating on materials that cannot be heated or on existing structures
In addition, when producing titanium oxide by thermally decomposing the titanium peroxide compound, there is a possibility that titanium oxides may aggregate to form particles, or that titanium oxide may be precipitated on the wall surface of the reaction vessel.
Therefore, there is a problem that additional titanium oxide is required and the manufacturing cost increases

Method used

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  • Method for producing titanium oxide, photocatalytically active mixture, method for forming titanium oxide film utilizing them, method for producing article coated with titanium oxide and article coate
  • Method for producing titanium oxide, photocatalytically active mixture, method for forming titanium oxide film utilizing them, method for producing article coated with titanium oxide and article coate
  • Method for producing titanium oxide, photocatalytically active mixture, method for forming titanium oxide film utilizing them, method for producing article coated with titanium oxide and article coate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0167] (A) Production of samples

[0168] Samples 1 to 36 were manufactured by using Examples 1 to 5 and Comparative Examples 1 and 2 below. In addition, the concentrations of the respective aqueous solutions and spraying amounts in samples 1 to 36 are in accordance with Tables 1 to 3.

[0169] [Table 1]

[0170] Test No.

Alkali coating amount

Composition and spray amount of titanium-hydrogen peroxide aqueous solution

Number of impregnation / drying steps

NO adsorption speed

(μmol / h)

NO photooxidation rate

(μmol / h)

Alkali type

coating status

Coating amount

(g / 200cm 2 )

Titanium salt type

Titanium concentration

(wt%)

Hydrogen peroxide concentration

(wt%)

Spray amount

(g-solution / 200cm 2 )

1

cement

pulp

10

TiCl 4

0.60

0.22

2.0

0

0.982

4.45

2

cement

pulp

10

TiCl 4

...

experiment example 2

[0184] Sample 16 and sample 17 were manufactured by the following procedure.

[0185] (1) The step of holding the alkali-containing material on the object to be filmed

[0186] A slurry-like alkali-containing material was applied to the surface of a concrete block (the same as in Experimental Example 1) as a film-forming object. As shown in Table 1, cement was used as the alkali-containing material.

[0187] (2) Step of attaching a soluble titanium salt solution to the surface of the object to be filmed

[0188] On the surface of the cement held by the concrete block, it is adhered by spraying an aqueous solution of a soluble titanium salt. Here, as the soluble titanium salt aqueous solution, a titanium sulfate aqueous solution is used.

[0189] (3) The step of attaching hydrogen peroxide to the object to be filmed

[0190] Adhesion is carried out by spraying hydrogen peroxide on the cement surface to which the titanium sulfate aqueous solution is attached.

[0191] (4) S...

experiment example 3

[0194] Sample 18 was produced through the following steps.

[0195] (1) The step of attaching the pertitanate ion aqueous solution to the object to be film-formed

[0196] Adhesion was carried out by spraying 10 g of pertitanate ion aqueous solution on the alkali-containing material which is the object of film formation. Here, as the alkali-containing material, 25 g of fly ash was used. This fly ash is an alkaline powder and has an alkali on its surface. In addition, as shown in Table 1, as the pertitanate ion aqueous solution, a mixed solution of titanium sulfate aqueous solution and hydrogen peroxide was used.

[0197] And, after spraying the pertitanate ion aqueous solution, it was dried.

[0198] (2) Steps of accumulating fly ash on concrete block

[0199] The fly ash to which the aqueous solution of pertitanate ions adhered was deposited on a concrete block (same as in Experimental Example 1).

[0200] (A-4) Experimental Example 4

[0201] Samples 19 to 29 were manu...

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Abstract

The invention relates to a method for producing titanium oxide which comprises reacting a peroxotitanate ion, which may be derived from a reaction product of an aqueous titanium salt solution and hydrogen peroxide, in the presence of an alkali. The reaction can be utilized for forming a titanium oxide film onto an article to have a film formed thereon. For example, an aqueous solution of a peroxotitanate ion (for example, Ti(SO4)2aq + H2O2) is attached to an article to have a film having an alkali on the surface thereof (for example, a cement product) by spraying, application, or immersion, to thereby form a titanium oxide film. The alkali may be originated from an aqueous alkali solution caused to be present on the surface by spraying, application or immersion. The surface preferably comprises a porous material. The method allows the formation of a titanium oxide film having highly dispersed titanium oxide particles, which results in the reduction of the amount of titanium oxide to be used, and also allows the formation of a titanium oxide film using a simple and easy process, which results in the reduction of the production cost required for forming a titanium oxide film.

Description

technical field [0001] The present invention relates to a method for producing titanium oxide, a photocatalyst active mixture, a method for forming a titanium oxide film using these, a method for producing a titanium oxide coating, a titanium oxide coating obtained by these, and a method for use in A solution for forming a titanium oxide film of the coated body. Background technique [0002] Titanium oxide (titanium dioxide: TiO 2 ) has the function of photocatalyst. When titanium oxide is irradiated with ultraviolet rays, electrons are excited by the photoelectric effect, electrons and holes are generated, and the electrons move to the surface of titanium oxide. Electrons reduce oxygen in air or water to superoxide, and holes, on the other hand, oxidize surface moisture to hydroxide radicals. Superoxide ions and hydroxide radicals are called active oxygen sources, which can exhibit strong oxidation. In this state, for example, if an organic matter comes into contact wit...

Claims

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Application Information

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IPC IPC(8): C01G23/053C01G23/04B01J35/02B01J35/00
CPCC01G23/0532B01J35/004C01G23/04B01J35/39
Inventor 重本直也
Owner SHIKOKU RES INST
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