Sol containing titanium dioxide, thin film formed therefrom and production process of the sol

A technology of titanium dioxide and sol, applied in the direction of titanium dioxide, chemical instruments and methods, catalyst activation/preparation, etc., can solve problems such as difficult to use photocatalysis

Inactive Publication Date: 2006-08-09
SHOWA DENKO KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is difficult to utilize photocatalysis in aut

Method used

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  • Sol containing titanium dioxide, thin film formed therefrom and production process of the sol
  • Sol containing titanium dioxide, thin film formed therefrom and production process of the sol
  • Sol containing titanium dioxide, thin film formed therefrom and production process of the sol

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0236] (1-1.) Synthesis of titanium dioxide sol

[0237] Distilled water (908 mL) was placed in a reactor equipped with a reflux condenser and heated steadily at 95°C. An aqueous solution of titanium tetrachloride (Ti content: 16.5% by mass, specific gravity: 1.52, product of Sumitomo Titanium) (92 mL) was added dropwise to the reactor at about 1 mL / min while maintaining stirring at about 200 rpm. Care was taken to prevent the temperature of the reaction mixture from dropping. The titanium tetrachloride concentration of the reaction mixture was found to be 0.5 mol / L (4% by mass in terms of titanium dioxide). In the reactor, the reaction mixture became cloudy immediately after starting the addition of titanium tetrachloride, but the temperature was maintained. When the addition was complete, the temperature was raised to 101°C (near boiling temperature) and held for 60 minutes. The sol thus obtained was washed with pure water through an ultrafiltration membrane (Microza ACP-...

Embodiment 2

[0265] (2-1.) Synthesis of a titanium dioxide-containing sol by dissolving a transition metal compound in a raw material

[0266] Hexachloroplatinic acid hexahydrate (0.108 g, 0.1% by mass based on titanium dioxide converted into platinum) was dissolved in an aqueous solution of titanium tetrachloride (92 mL), to thereby prepare an aqueous solution of titanium tetrachloride containing platinum. The procedure of (1-1.) was repeated except that the solution thus prepared was used instead of the titanium tetrachloride aqueous solution to thereby synthesize the sol, thereby synthesizing the sol. Thus, a sol containing a transition metal compound and titanium dioxide is obtained in a single step.

[0267] The amount of the precipitated component was found to be 3% by mass of the total solid content of the sol. The transmittance of the sol measured at 550 nm by using a measuring cell with an optical path length of 2 mm was 68%.

[0268] The BET specific surface area of ​​the solid t...

Embodiment 3

[0281] (3-1.) Synthesis of titanium dioxide sol

[0282] The procedure of (1-1.) was repeated to thus synthesize a brookite-containing titania sol.

[0283] (3-2.) Mixing of titanium dioxide sol and transition metal (Fe) compound

[0284] The steps of (1-2.) were repeated except that hexachloroplatinic acid hexahydrate (special grade, Kanto Kagaku) ​​was replaced by ferric chloride (special grade, product of Kanto Kagaku) ​​(0.097 g, 0.1% by mass based on titanium dioxide converted into iron). preparation) (0.054 g) to thereby mix the titanium dioxide sol with the metal compound.

[0285] The amount of the precipitated component was found to be 3% by mass of the total solid content of the sol. The transmittance of the sol measured at 550 nm by using a measuring cell with an optical path length of 2 mm was 69%.

[0286] The solid sample thus obtained was subjected to BET specific surface area measurement, powder X-ray diffraction measurement and Rietveld analysis. The resul...

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Abstract

A sol comprising a precipitated component in an amount of less than 10 mass % based on the total solid content of the sol and comprising titanium oxide comprising a transition metal compound. When the sol is mixed with a binder which can be hardened at ambient temperature, the mixture readily forms a thin film having high photocatalytic performance on a substrate of poor heat resistance such as plastics or paper. The titanium oxide sol can readily forms titanium oxide thin film on surfaces of a variety of substrate materials such as ceramics, glass, metal, plastics, wood, or paper. Articles to which photocatalytic performance or hydrophilicity is imparted include building materials, fluorescent lamps, glass panes, machinery, vehicles, glass products, household electrical appliances, water purifying apparatuses, agricultural materials, electronic apparatus, tools, tableware, bath products, toiletry products, furniture, clothing, cloth products, fibers, leather products, paper products, sporting goods, beauty-related instruments, health improvement instruments, medical goods, futon, containers, eyeglasses, signboards, piping, wiring, brackets, sanitary materials, and automobile parts as well as environmental purification apparatuses/units.

Description

[0001] Cross References to Related Applications [0002] This application is an application filed under 35 U.S.C. § 111(a) that requires 35 U.S.C. § 119(e)(1) of the application filed under 35 U.S.C. Filing Date Benefit of Provisional Application No. 60 / 486,217 and Provisional Application No. 60 / 497,307, filed August 25, 2003. technical field [0003] The invention relates to a sol containing a photocatalyst with high photoactivity, a method for preparing the sol, and an application of the sol. More particularly, the present invention relates to a photocatalyst sol exhibiting sufficient photocatalytic performance when irradiated with light from an actual light source such as a fluorescent lamp or a light source emitting light having a wavelength of 400 nm or longer, and to the sol the use of. Background technique [0004] Research has been conducted on titanium dioxide used as a photocatalyst for environmental purification processes such as antibacterial, deodorizing, anti...

Claims

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Application Information

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IPC IPC(8): B01J35/00B01J23/42B01J37/03C01G23/00C01G23/053
Inventor 胁坂安显黑田靖
Owner SHOWA DENKO KK
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