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Photocatalyst material, method for decomposition of organic material, interior member, air purification device, and apparatus for preparation of oxidizing agent

A photocatalyst and organic material technology, applied in the field of photocatalyst materials, can solve the problems of reduced oxidative decomposition activity, poor oxidative decomposition activity, etc., and achieve the effects of strong oxidative decomposition performance, high safety, and high visible light activity

Active Publication Date: 2011-02-16
THE UNIV OF TOKYO +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the potential at the bottom of the conduction band is greater than the one-electron reduction potential of oxygen (-0.046 V vs SHE, pH = 0), so photoexcited electrons cannot undergo one-electron reduction of oxygen atoms
Photoexcited electrons recombine with generated holes for reducing W(VI) of tungsten trioxide to W(V) to exhibit photochromism, resulting in reduced oxidative decomposition activity
Therefore, tungsten trioxide exhibits significantly poor oxidative decomposition activity

Method used

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  • Photocatalyst material, method for decomposition of organic material, interior member, air purification device, and apparatus for preparation of oxidizing agent
  • Photocatalyst material, method for decomposition of organic material, interior member, air purification device, and apparatus for preparation of oxidizing agent
  • Photocatalyst material, method for decomposition of organic material, interior member, air purification device, and apparatus for preparation of oxidizing agent

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] filter WO 3 The powder (average particle diameter: 250 nm, available from Kojundo Chemical Laboratory Co., Ltd.) to remove particles having a diameter of 1 μm or more, respectively, was then pre-sintered at 650° C. for 3 hours to obtain tungsten trioxide fine particles.

[0051] The obtained tungsten trioxide particles were suspended in distilled water (WO 3 relative to H 2 O is 10 wt%). Next, 0.1 wt% (Cu(II) vs. WO 3 ) of CuCl 2 ·2H 2 O (available from Wako Pure Chemical Industries, Ltd.) was added to the suspension, which was then heated up to 90°C with stirring and held for 1 hour. Next, the resulting suspension is filtered by suction filtration. Then, the obtained residue was washed with distilled water, and then dried by heating at 110° C. to obtain a sample of tungsten trioxide fine particles, each of which had a divalent copper salt supported on the surface thereof.

[0052] The obtained results were analyzed by inductively coupled plasma emission spectrom...

Embodiment 2

[0054] A sample of tungsten trioxide microparticles on which a divalent copper salt was supported was obtained in almost the same manner as in Example 1. However, do not pre-determine WO 3 The powders were sintered to obtain samples of tungsten trioxide particles in this example.

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Abstract

Disclosed is a photocatalyst material characterized by comprising tungsten trioxide microparticles and a bivalent copper salt carried on the surfaces of the microparticles. It becomes possible to increase the oxidative decomposition activity of tungsten trioxide under irradiation with visible light by utilizing a fact that a bivalent copper salt can act as a multielectron reduction catalyst for oxygen.

Description

technical field [0001] The present invention relates to a visible light-activated photocatalyst material, a method for decomposing an organic material by using the photocatalyst material, and internal members, an air purification device, and an apparatus for preparing an oxidant, respectively, formed of the photocatalyst material. Background technique [0002] Recently, many studies have been conducted to develop various photocatalyst materials for applications such as environmental cleaning, deodorization, dust removal, sterilization, and the like. This catalyst material is designed to use light at a lower cost and with a significantly reduced environmental load as a light source for the oxidative decomposition of organic and inorganic materials such as nitrogen oxides. [0003] Titanium dioxide has been widely regarded as a photocatalyst, which exhibits activity when exposed to UV light. The catalyst material has been researched and developed to meet the requirements for ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/02B01J23/85A61L9/00A61L9/01
CPCB01J23/72B01J37/009B01J23/888A61L9/18B01J37/0211B01J37/0072A61L9/205B01J37/0234B01J35/004B01J37/04B01J35/39B01J23/85A61L9/01B01D53/86B01J35/00
Inventor 桥本和仁入江宽三浦脩平神谷和秀三木慎一郎高滨孝一矢口充雄
Owner THE UNIV OF TOKYO
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