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A kind of visible light response catalyst and its preparation method and application

A visible light and catalyst technology is applied in the field of photocatalytic materials to achieve the effects of strong adsorption capacity, strong visible light activity, and improved effective utilization.

Inactive Publication Date: 2021-03-30
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most studies on photocatalytic degradation of toluene catalysts focus on TiO 2 Or ZnO catalyst, there is no related report on visible light-driven manganese oxide catalyst

Method used

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  • A kind of visible light response catalyst and its preparation method and application
  • A kind of visible light response catalyst and its preparation method and application
  • A kind of visible light response catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] (1) Mn(NO 3 ) 2 solution and 0.15g of glucose were added to ethylene glycol (50mL), magnetically stirred and mixed to obtain a mixed solution, wherein the final concentration of tetrabutylammonium bromide was 0.12mol / L, and the final concentration of urea was 0.34mol / L L, urea and Mn(NO 3 ) 2 The molar ratio is 0.6, and the final concentration of glucose is 0.01mol / L; transfer the mixed solution to a polytetrafluoroethylene-lined stainless steel autoclave, and conduct a hydrothermal reaction at 160°C in an electric constant temperature drying oven for 1 hour; After cooling to room temperature, the reaction product was taken out, and the reaction product was centrifuged to obtain a precipitate; the precipitate was washed three times with deionized water and absolute ethanol, and dried at 60°C for 12 hours to obtain an intermediate product;

[0042] (2) The intermediate product prepared in step (1) was calcined at 400°C for 3 hours in an air atmosphere to obtain a visi...

Embodiment 2

[0044] (1) Mn(NO 3 ) 2Solution and 0.25g of glucose were added in ethylene glycol (50mL), magnetically stirred and mixed to obtain a mixed solution, wherein the final concentration of tetrabutylammonium bromide was 0.12mol / L, and the final concentration of urea was 0.34mol / L L; transfer the mixed solution to a polytetrafluoroethylene-lined stainless steel autoclave, and conduct a hydrothermal reaction at 160°C in an electric constant temperature drying oven for 1 h; after the reaction kettle is naturally cooled to room temperature, the reaction product is taken out, and the reaction product is centrifuged to obtain Precipitate; the precipitate was washed three times with deionized water and absolute ethanol, and dried at 60°C for 12 hours to obtain an intermediate product;

[0045] (2) The intermediate product prepared in step (1) was calcined at 400°C for 3 hours in an air atmosphere to obtain a visible light-responsive catalyst (carbon-coated manganese dioxide ε-MnO 2 @0.2...

Embodiment 3

[0047] (1) Mn(NO 3 ) 2 solution and 0.45g of glucose were added to ethylene glycol (50mL), magnetically stirred and mixed to obtain a mixed solution, wherein the final concentration of tetrabutylammonium bromide was 0.12mol / L, and the final concentration of urea was 0.34mol / L L; transfer the mixed solution to a polytetrafluoroethylene-lined stainless steel autoclave, and conduct a hydrothermal reaction at 160°C in an electric constant temperature drying oven for 1 h; after the reaction kettle is naturally cooled to room temperature, the reaction product is taken out, and the reaction product is centrifuged to obtain Precipitate; the precipitate was washed three times with deionized water and absolute ethanol, and dried at 60°C for 12 hours to obtain an intermediate product;

[0048] (2) The intermediate product obtained in step (1) was calcined at 400° C. for 3 h in an air atmosphere to obtain a visible light-responsive catalyst (carbon-coated manganese dioxide ε-MnO2@0.45C)....

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Abstract

The invention belongs to the technical field of photocatalytic materials, and specifically relates to a visible light response catalyst and its preparation method and application. The present invention uses glucose as the carbon source, manganese nitrate as the manganese source, urea as the alkali source, tetrabutylammonium bromide as the dispersant, and obtains the carbon-coated precursor MnCO through a hydrothermal method. 3 , and then calcined at high temperature to obtain a visible light-responsive catalyst with a three-dimensional hierarchical structure. The catalyst is composed of amorphous carbon wrapped in ε-MnO 2 surface composition. The morphology of the catalyst prepared by the invention can be simply controlled by the addition amount of reactant glucose, and has morphology controllability. Due to the formation of the surface carbon layer, the catalyst has strong adsorption capacity and visible light activity, and exhibits excellent visible light catalytic degradation activity of toluene. The toluene degradation rate is as high as 87.34% in 70 minutes.

Description

technical field [0001] The invention belongs to the technical field of photocatalytic materials, and in particular relates to a visible light-responsive catalyst and its preparation method and application. Background technique [0002] With the rapid development of energy and chemical industries, my country's annual consumption of fossil fuels continues to rise, and the resulting environmental pollution is also becoming more and more serious. In particular, volatile organic pollutants (VOC) in the atmospheric environment pose a serious threat to human health and ecosystem stability. Compounds mainly include hydrocarbons, oxygenated hydrocarbons, halogenated hydrocarbons and sulfurized hydrocarbons. Due to the urgency of environmental problems, many countries and some regions have also promulgated strict VOC emission standards, but this cannot solve the problem of air pollution from the root. In addition, the traditional waste gas treatment methods (absorption method, adsor...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/34B01J35/10B01J37/08B01J37/10B01D53/86B01D53/72
CPCB01D53/8668B01J23/34B01J37/084B01J37/088B01J37/10B01D2255/802B01D2257/7027B01D2255/2073B01J35/39B01J35/60
Inventor 周俊丽张亚军朱宸光陈浩明朱海安余林
Owner GUANGDONG UNIV OF TECH
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