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Amorphous bismuth oxide hybrid photocatalyst, preparation method and usage method

A bismuth oxide, amorphous technology, applied in the field of photocatalyst preparation, can solve problems such as low NO degradation rate, and achieve the effects of increasing crystallinity, simple preparation and remarkable effect

Active Publication Date: 2017-08-18
CHONGQING TECH & BUSINESS UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the invention of this application is to provide an amorphous bismuth oxide composite photocatalyst, its preparation method and its use method, so as to solve the problem of low degradation rate of NO by existing photocatalysts

Method used

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  • Amorphous bismuth oxide hybrid photocatalyst, preparation method and usage method
  • Amorphous bismuth oxide hybrid photocatalyst, preparation method and usage method
  • Amorphous bismuth oxide hybrid photocatalyst, preparation method and usage method

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Effect test

Embodiment 1

[0075] 6mol(NO 3 ) 3 ·5H 2 O was dissolved in 40 ml of bismuth solution with a volume ratio of ethanol and ethylene glycol of 1:1, and the mixture was heat-treated at a heating temperature of 160° C. and the heat treatment time was 3 hours to obtain an amorphous bismuth oxide solid. Disperse 1g of amorphous bismuth oxide in 30ml of distilled water at room temperature, add dropwise 30mL of 1mmol / L sodium borohydride solution, add 1g of PVP as a stabilizer, and react for 1h to obtain the product in a test tube for later use.

[0076] The amorphous bismuth oxide composite photocatalyst with a reducing agent concentration of 1 mmol / L prepared in the examples of this application degrades NO. The specific process is: at a relative humidity of 60%, an oxygen content of 21%, and a flow of NO gas flow of 3.3L / L min. Under the condition that the initial concentration of NO is 600μg / kg, 0.2g of the amorphous bismuth oxide composite photocatalyst prepared in the example is placed on a glass d...

Embodiment 2

[0078] 6mol(NO 3 ) 3 ·5H 2 O was dissolved in 40 ml of bismuth solution with a volume ratio of ethanol and ethylene glycol of 1:1, and the mixture was heat-treated at a heating temperature of 160° C. and the heat treatment time was 3 hours to obtain an amorphous bismuth oxide solid. Disperse 1g of amorphous bismuth oxide in 30ml of distilled water at room temperature, add dropwise 30mL of 3mmol / L sodium borohydride solution, add 1g of PVP as a stabilizer, react for 1h, and put the product in a test tube for later use.

[0079] Degradation of NO by the amorphous bismuth oxide composite photocatalyst prepared in the example of this application with a reducing agent concentration of 3 mmol / L is the same as that of Example 1 to calculate the degradation of NO by the amorphous bismuth oxide composite photocatalyst prepared in the example of this application The rate is 23.4%. It can be seen that bismuth element can activate the NO degradation rate of amorphous bismuth oxide, and the st...

Embodiment 3

[0081] 6mol(NO 3 ) 3 ·5H 2 O was dissolved in 40 ml of bismuth solution with a volume ratio of ethanol and ethylene glycol of 1:1, and the mixture was heat-treated at a heating temperature of 160° C. and the heat treatment time was 3 hours to obtain an amorphous bismuth oxide solid. Disperse 1g of amorphous bismuth oxide in 30ml of distilled water at room temperature, add 1g of PVP as a stabilizer, react for 1h, and add 30ml of 5mmol / L sodium borohydride solution dropwise to obtain the product and put it in a test tube for later use.

[0082] Degradation of NO by the amorphous bismuth oxide composite photocatalyst prepared in the example of this application with a reducing agent concentration of 5mmol / L is the same as that of Example 1 and calculated to obtain the degradation of NO by the amorphous bismuth oxide composite photocatalyst prepared in the example of this application The rate is 37.1%. It can be seen that bismuth element can activate the NO degradation rate of amorphou...

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Abstract

The invention discloses an amorphous bismuth oxide hybrid photocatalyst, a preparation method and a usage method. The preparation method comprises the following steps: dissolving bismuth an elementary substance precursor into a solvent to obtain a bismuth solution, wherein the solvent comprises ethanol and ethylene glycol in the volume ratio of 1:1; performing thermal treatment to the bismuth solution under the environment of 160DEG C to obtain amorphous bismuth oxide; evenly dispersing the amorphous bismuth oxide into water to obtain a dispersing agent, and dropwise adding a reductive solvent into the dispersing agent to obtain a mixture solution; and reacting the mixture solution under room temperature conditions, and standing to obtain the amorphous bismuth oxide hybrid photocatalyst. Known from the experimental analysis, for the amorphous bismuth oxide hybrid photocatalyst prepared by using the preparation method, the elementary substance bismuth reduced in situ is modified on the surface of the amorphous bismuth oxide as a photoelectron capturing center to promote the separation of photon-generated carriers and enhance the absorption capability of visible light, so that the photocatalytic activity of the amorphous bismuth oxide can be activated.

Description

Technical field [0001] This application relates to the technical field of photocatalyst preparation, and more specifically to an amorphous bismuth oxide composite photocatalyst, preparation method and use method Background technique [0002] With the advancement of human science and technology, industry has developed on a large scale, automobiles are becoming more and more popular, and a large amount of nitrogen oxides are discharged into the atmosphere. Nitrogen oxide is a pollutant that destroys photochemical smog, acid rain, and ozone layer. Nitrogen oxide has become an air pollution problem that needs to be solved urgently in all countries in the world. The photocatalyst can cause the degradation reaction of nitrogen oxides under the action of photocatalysis to generate H 2 0, C0 2 , Salt, etc. to achieve harmlessness, thereby purifying the environment. [0003] Generally, the energy band of a semiconductor photocatalyst is discontinuous. There is a forbidden band between the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/18B01D53/86B01D53/56
CPCB01D53/007B01D53/8628B01J23/18B01D2259/802B01J35/39
Inventor 董帆李欣蔚崔雯孙艳娟
Owner CHONGQING TECH & BUSINESS UNIV
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