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Titanium oxide base photocatalyst, process for producing the same and use thereof

A technology of photocatalyst and titanium oxide, applied in the direction of physical/chemical process catalysts, chemical instruments and methods, chemical/physical processes, etc., can solve the problem of low anti-fouling properties

Inactive Publication Date: 2007-05-23
SUMITOMO METAL IND LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Depending on the irradiation conditions, it takes a long time to decompose the dirt, so the antifouling property may be lowered.

Method used

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  • Titanium oxide base photocatalyst, process for producing the same and use thereof
  • Titanium oxide base photocatalyst, process for producing the same and use thereof
  • Titanium oxide base photocatalyst, process for producing the same and use thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0105] [Synthesis of titanium oxide-based photocatalyst]

[0106] At room temperature, while stirring, the TiCl 4 Aqueous ammonia (28%) was added dropwise to an aqueous solution (Ti part concentration: 8.25%) until the pH became 4.8. The precipitated solid matter was collected by filtration, washed with water sufficiently, and then vacuum-dried at 80° C. to obtain a titanium (hydr)oxide powder as a raw material.

[0107] 200 g of the raw material powder obtained in this way was put into a kiln type heat treatment apparatus, and after nitrogen substitution was carried out in the system, the temperature was raised to 315°C. Next, the TiCl containing 1.4vol% 4 Hydrogen gas, which is a hydrolyzable compound, is introduced into the device, and is in contact with the raw material powder for 20 minutes. The first stage of heat treatment is performed to bond titanium chloride to the surface of the powder. Then, the inside of the system was replaced with argon, and gradually cooled ...

Embodiment 2

[0142] [Synthesis of titanium oxide-based photocatalyst]

[0143] At room temperature, the TiCl 4 Aqueous ammonia (28%) was added to the aqueous solution (Ti component concentration: 8.25%) until the pH became 4.8. The precipitated solid matter was collected by filtration, washed with water sufficiently, and then vacuum-dried at 80° C. to obtain a titanium (hydr)oxide powder as a raw material.

[0144] 200 g of the raw material powder thus obtained was put into a kiln-type heat treatment apparatus, and the inside of the system was replaced with argon, and then the temperature was raised to 315°C. Next, add 1.4vol% TiCl 4 Hydrogen gas, which is a hydrolyzable compound, is introduced into the device, and it is brought into contact with the raw material powder for 20 minutes, and the first stage of heat treatment is performed to bind titanium chloride on the surface of the powder. Then, the inside of the system was replaced with argon again, and gradually cooled to room temper...

Embodiment 3

[0157] No.1

[0158] At room temperature, the TiCl 4 Aqueous ammonia (28%) was added to the aqueous solution (Ti component concentration: 8.25%) until the pH became 4.1. The reaction mixture was left to stand at room temperature for 10 days to mature the precipitate, and the solid was collected by filtration, washed with water, and vacuum-dried at 80° C. to obtain a titanium (hydr)oxide powder as a raw material.

[0159] 200 g of the raw material powder obtained in this way was put into a kiln-type heat treatment apparatus, and the inside of the system was replaced with argon, and then the temperature was raised to 315°C. Next, hydrogen gas containing 1.4vol% TiCl4 as a hydrolyzable compound is introduced into the device, and it is contacted with the raw material powder for 20 minutes, and the first stage of heat treatment is carried out to combine titanium chloride on the surface of the powder. Then, the inside of the system was replaced with argon again, and gradually cool...

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Abstract

A visible-light-responsive highly active titanium oxide base photocatalyst is produced by first neutralizing an acidic titanium compound with ammonia or an amine under such conditions that the terminal pH is <= 7 to thereby obtain a raw material of titanium oxide (hydroxide), subjecting the raw material to heat treatment in an environment containing a hydrolysable compound, bringing the heat treated material into contact with water and carrying out further heat treatment thereof at >= 350 1 / 2 C. The thus obtained titanium oxide base photocatalyst is comprised of a titanium oxide of <= 120 M<2> / g specific surface area and >= 600 mueq / g surface hydroxyl quantity. Preferably, the density of surface hydroxyl is >= 8 mueq / m<2>, and with respect to the surface hydroxyl, the ratio of terminal hydroxyl quantity (T) to bridged hydroxyl quantity (B), T / B, is >= 0.20. This titanium oxide base photocatalyst exhibits an ESR spectrum having two types of triplet signals having respective main-spectrum g-values of 1.993 to 2.003 and 2.003 to 2.011, and can be identified by a deviation of the intensity ratio of these signals before visible light irradiation, during irradiation and immediately after discontinuation of irradiation from those of the prior art photocatalysts.

Description

technical field [0001] The present invention relates to a highly active visible light-responsive titanium oxide-based photocatalyst capable of exerting a photocatalytic action not only by ultraviolet light but also by irradiation of visible light, and a method for producing the same. The present invention also relates to a visible light-responsive photocatalyst functional member using the photocatalyst, a method for producing the same, and a dispersion liquid and a coating liquid containing the photocatalyst. Background technique [0002] In recent years, the photocatalytic effect exhibited by titanium oxide has been applied to various atmosphere purification technologies such as deodorization, antibacterial, and antifouling. As a photocatalyst, ordinary anatase-type titanium oxide has a bandgap of about 3.2eV, receives short-wavelength ultraviolet rays with a wavelength shorter than about 380nm, and performs reactions such as decomposition of organic matter. Therefore, irr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/02B32B9/00C09D1/00B01J35/00
Inventor 西原克浩正木康浩福田匡冈田克己下崎新二永冈佐太延菅野英明东和臣小笠原忠司
Owner SUMITOMO METAL IND LTD
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