Photocatalyst based on composite oxide responsive to visible light and method for decomposition and removal of harmful chemical material using the same

A technology of composite oxides and photocatalysts, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc. question

Inactive Publication Date: 2007-01-31
NAT INST FOR MATERIALS SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

On the other hand, less than 5% in the ultraviolet region with a wavelength of 400nm or less
A patent application has been made on this photocatalyst for some of the results (see Patent Documents 1 to 8, however, Patent Documents 7 and 8 have not yet been published, and the publication number has not been determined)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] BaBiO was synthesized by the solid-state reaction method by the following steps 3 .

[0031] That is, weigh 5.00g of BaCO respectively 3 , 5.914g Bi 2 o 3 , modulated with 10g BaBiO 3 corresponding raw material mixture. The raw material mixture was put into an alumina crucible, kept at 700° C. for 5 hours in an electric furnace set under an atmospheric pressure atmosphere, and sintered at 800° C. for 12 hours after performing a preliminary reaction. After the sintering, the burnt product was pulverized in a mortar to a size of 10 mm or less. The chemical composition and optical characteristics and catalytic performance of the obtained samples were evaluated. As a result, the chemical composition has a BaBiO 3represented composition. From the results of the ultraviolet-visible absorption spectrum measurement, it can be known that the photocatalyst obtained in this example shows absorption in the visible light region from the ultraviolet region to greater than or ...

Embodiment 2

[0035] For using BaBiO 3 The light wavelength dependence of photocatalytic decomposition of acetaldehyde was studied.

[0036] In Example 1, a cut-off filter capable of passing only light longer than 580 nm was inserted in the window of the xenon lamp, and the photodecomposition reaction of acetaldehyde was performed.

[0037] The results showed that about 60% of the acetaldehyde was decomposed in only 20 minutes under the irradiation of visible light through a filter of 580 nm.

Embodiment 3

[0039] 0.3g BaBiO 3 Suspend in 100 ml of 15.3 mg / l methylene blue aqueous solution to carry out the photolysis reaction of methylene blue. Light was irradiated from the outside while stirring with a magnetic stirrer. A 300W xenon lamp was used as a light source, and the reaction chamber was made of Pyrex glass (registered trademark of Corning Corporation).

[0040] The concentration change caused by photodecomposition of methylene blue was studied by ultraviolet-visible absorption spectrometry. As a result, it was found that 90% or more of methylene blue could be decomposed within 60 minutes under irradiation with visible light passing through a filter of 420 nm.

[0041] In the above-mentioned embodiment, the general formula BaBi x o y Under the situation of x=1, y=3, x, y are designed and synthesized, and based on this, the effect of the photocatalyst of the present invention has been described, but the composition range of the present invention is as described above, an...

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PUM

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Abstract

The invention provides a photocatalyst capable of utilizing not only an ultraviolet light, but also a visible light, to use the photocatalyst in the decomposition treatment of a harmful chemical in a gas phase or a liquid phase, and to provide a means for converting a harmful material into a harmless one by the use of the photocatalyst. A photocatalyst which comprises a composite oxide semiconductor represented by the general formula: BaBixOy [wherein x and y are 0.5 < x <2, and 2.5 < y < 4] as a catalyst component; and the above subject can be solved using the photocatalyst.

Description

technical field [0001] The present invention relates to a photocatalyst which is a composite oxide semiconductor having a specific composition including bismuth oxide and which has excellent photoresponsiveness for effectively absorbing ultraviolet rays and visible rays contained in sunlight or the like. In particular, it relates to a highly active photocatalyst for decomposing harmful substances excellent in the ability to decompose harmful chemical substances, an environmental purification method using the photocatalyst, and a method for improving the global environment, especially for decomposing various harmful chemicals represented by dioxin. Substances, methods of removing harmful substances for detoxification. Background technique [0002] Global environmental issues, a negative legacy of the rapid economic growth of the 20th century, are becoming serious. Needless to say, environmental hormones such as dioxins, pesticides and odorous substances in water and air, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J35/02B01J23/18B01D53/86B01J23/644B01J23/843B01J35/00B01J37/00B01J37/08
CPCB01D2255/2042B01J23/6447B01D53/8662B01J37/0036B01J23/18B01D2255/802B01J35/004B01J37/088B01J23/8437B01D2255/40B01D53/8668
Inventor 叶金花唐军旺
Owner NAT INST FOR MATERIALS SCI
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