Visible light responding photocatalyst and low temperature combustion synthesis method

A photocatalyst and visible light technology, applied in the field of photocatalysis, achieves the effects of easy phase formation, simple preparation process and low cost

Inactive Publication Date: 2008-11-19
SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, the preparation of barium bismuthate photocatalyst by low-temperature combustion synthesis method has not been reported yet.

Method used

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  • Visible light responding photocatalyst and low temperature combustion synthesis method
  • Visible light responding photocatalyst and low temperature combustion synthesis method
  • Visible light responding photocatalyst and low temperature combustion synthesis method

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Effect test

Embodiment 1

[0024] Barium bismuthate uses analytically pure Bi(NO 3 ) 3 ·5H 2 O and analytically pure Ba(NO 3 ) 2 Synthesized as raw material, according to BaO·Bi 2 o 3 stoichiometric ratio, weigh 0.97g Bi(NO 3 ) 3 ·5H 2 O was dissolved in 12ml of 0.25mol / L ethylenediaminetetraacetic acid amine solution (7.3063g of ethylenediaminetetraacetic acid was dissolved in 20ml of concentrated ammonia water and deionized water was added to make up to 100ml) and 12ml of 0.5mol / L lemon In the mixed solution of acid solution (10.5g of citric acid monohydrate dissolved in 100ml of deionized water), due to the complexation of organic matter, it is easily hydrolyzed into Bi(NO 3 ) 3 ·5H 2 O completely dissolves to form a clear solution. Then add 0.261g Ba(NO 3 ) 2 , to obtain a transparent precursor solution after stirring and dissolving. Dehydrate the precursor solution at 160°C for 24 hours to obtain a black fluffy dry precursor, grind it, then heat the resulting precursor powder at a rat...

Embodiment 2

[0028] According to 2BaO·Bi 2 o 3 The stoichiometric batching, using analytically pure Bi(NO 3 ) 3 ·5H 2 O and analytically pure Ba(NO 3 ) 2 As a synthetic raw material, according to 2BaO·Bi 2 o 3stoichiometric ingredients, weigh 0.97gBi(NO 3 ) 3 ·5H 2 O is dissolved in the mixed solution of the amine solution of 16ml 0.25mol / L ethylenediaminetetraacetic acid and the glycine solution of 16ml 0.5mol / L, obtains containing Bi(NO 3 ) 3 ·5H 2 A clear solution of O. Then add 0.522g Ba(NO 3 ) 2 , to obtain a transparent precursor solution after stirring and dissolving. The precursor solution was dehydrated at 150°C for 10 hours to obtain a black fluffy dry precursor, which was ground and then heated to 400°C for 6 hours at a rate of 2°C / min. ℃ for 10 hours, you can get barium bismuth acid powder, but the degradation effect is better than BaO Bi 2 o 3 slightly worse.

Embodiment 3

[0030] According to BaO·Bi 2 o 3 stoichiometric ratio, weigh 0.97g Bi(NO 3 ) 3 ·5H 2 O (analytically pure) is dissolved in 12ml of 0.25mol / L ethylenediaminetetraacetic acid amine solution, Bi(NO 3 ) 3 ·5H 2 O completely dissolves to form a clear solution. Then add 0.261g Ba(NO 3 ) 2 (Analytical pure), stirring and dissolving to obtain a transparent precursor solution. Dehydrate the precursor solution at 160°C for 24 hours to obtain a black fluffy dry precursor, grind it, then heat the resulting precursor powder at a rate of 2°C / min to 350°C for 10 hours, grind it, and finally put the powder at 600°C After 2 hours of heat preservation, a comparison sample without fuel citric acid can be obtained. After the reaction, the obtained product was filtered, washed three times with deionized water, then washed three times with absolute ethanol, and then dried at 75°C. through figure 1 The XRD component analysis shown in, the product is mainly Bi 2 o 3 and barium bismuthat...

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Abstract

The invention relates to a visible light responding photo-catalyst as well as the low temperature combustion synthetic method thereof. The invention is characterized in that the provided photo-catalyst is barium bismuthate, wherein the mol ratio of barium ions to bismuth ions is 1-6:2, the method is characterized in that the amine solution of bismuth nitrate and ethylene diamine tetraacetic acid is mixed with citric acid solution according to the stoichiometric proportion, so as to form a transparent solution which is then added with barium nitrate, stirring is carried out for dissolution, thereby obtaining a transparent precursor solution; then the low temperature combustion heat treatment is carried out in three stages, according to the photo-catalyst provided by the invention, photo-response exists from the ultraviolet region to the visible region, and the invention has photo catalytic degradation effect on methylene blue under the visible light irradiation.

Description

technical field [0001] The invention relates to a visible light-responsive photocatalyst that can be used for environmental pollution control and a synthesis method of the low-temperature combustion thereof, belonging to the technical field of photocatalysis. Background technique [0002] Today, with the increasing global environmental pollution and energy crisis, semiconductor photocatalysis technology, as one of the most promising environmentally friendly and clean technologies in the 21st century, has attracted widespread attention. Photocatalytic technology is the process of decomposing organic matter and decomposing water to produce hydrogen by using the energy of light absorbed by photocatalysts. Its mechanism of action is to use the characteristic that the surface energy of the catalyst is activated under illumination. When the semiconductor photocatalyst is irradiated with a light wave whose energy is equal to or greater than the semiconductor bandgap energy, the ele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01J23/02
Inventor 王文中严惠娟
Owner SHANGHAI INST OF CERAMIC CHEM & TECH CHINESE ACAD OF SCI
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