Preparation of composite photocatalyst and application of composite photocatalyst in purification of VOCs

A photocatalyst and catalyst technology, applied in the field of environmental pollution control, can solve the problems of affecting the catalytic efficiency, reducing the diffusion rate of substances, increasing the mass transfer resistance, etc., to achieve the effects of accelerating the diffusion rate, enhancing the adsorption performance, and promoting the transformation.

Active Publication Date: 2021-08-17
紫科装备股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the organic compounding of MOFs materials and P25 for the purification of typical toxic VOCs is unique and innovative, and has important application prospects in the field of air purification. Although the small pore size of MOFs provides a large specific surface area, it increases Larger mass transfer resistance reduces the diffusion rate of the substance, thus affecting the catalytic efficiency

Method used

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  • Preparation of composite photocatalyst and application of composite photocatalyst in purification of VOCs
  • Preparation of composite photocatalyst and application of composite photocatalyst in purification of VOCs
  • Preparation of composite photocatalyst and application of composite photocatalyst in purification of VOCs

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] A kind of composite photocatalyst, its preparation method comprises the following steps:

[0038] S1. Weigh 2.0g of polyvinylpyrrolidone, 0.6g of azodicyanovaleric acid and 3.0g of styrene respectively, add 25ml of ethanol aqueous solution with a volume ratio of 2:1 after mixing, stir well and heat, and heat up to within 30min Boiling, reflux reaction under stirring conditions for 24h, after cooling, centrifuge to separate the precipitate, wash the precipitate with methanol and / or deionized water and then disperse in methanol to obtain suspension A, and the dispersion ratio of the precipitate is 3mg / ml;

[0039] S2. Weigh 2.0 g of polyvinylpyrrolidone and completely dissolve it in 40 ml of methanol, add 0.5 g of nano-titanium dioxide (P25), stir for 20 minutes, centrifuge and separate the precipitate, wash the precipitate with methanol and / or deionized water, dry, and then disperse in In the suspension A, the suspension B was obtained, and the precipitation dispersion r...

Embodiment 2

[0044] A kind of composite photocatalyst, its preparation method comprises the following steps:

[0045] S1. Weigh 2.0g of polyvinylpyrrolidone, 0.6g of azodicyanovaleric acid and 3.0g of styrene respectively, add 25ml of ethanol aqueous solution with a volume ratio of 2:1 after mixing, stir well and heat, and heat up to within 30min Boiling, reflux reaction under stirring conditions for 24h, after cooling, centrifuge to separate the precipitate, wash the precipitate with methanol and / or deionized water and then disperse in methanol to obtain suspension A, and the dispersion ratio of the precipitate is 3mg / ml;

[0046] S2. Weigh 2.0 g of polyvinylpyrrolidone and completely dissolve it in 40 ml of methanol, add 0.5 g of reduced titanium dioxide, stir for 20 minutes, centrifuge to separate the precipitate, wash the precipitate with methanol and / or deionized water, dry it, and then disperse it in the In the above-mentioned suspension A, obtain suspension B, the precipitation disp...

Embodiment 3

[0051] A kind of composite photocatalyst, its preparation method comprises the following steps:

[0052] S1. Weigh 2.0g of polyvinylpyrrolidone, 0.6g of azodicyanovaleric acid and 3.0g of styrene respectively, add 25ml of ethanol aqueous solution with a volume ratio of 2:1 after mixing, stir well and heat, and heat up to within 30min Boiling, reflux reaction under stirring conditions for 24h, after cooling, centrifuge to separate the precipitate, wash the precipitate with methanol and / or deionized water and then disperse in methanol to obtain suspension A, and the dispersion ratio of the precipitate is 3mg / ml;

[0053] S2. Weigh 2.0g of polyvinylpyrrolidone and completely dissolve it in 40ml of methanol, add 0.5g of reduced titanium dioxide and 0.14g of cadmium-cobalt bimetallic sulfide solid solution, stir for 20min, centrifuge and precipitate, and the precipitate is washed with methanol and / or After washing with deionized water, drying, and then dispersing in the suspension ...

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PUM

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Abstract

The invention provides a preparation method of a composite photocatalyst and application of the composite photocatalyst in purification of VOCs, and belongs to the technical field of environmental pollution control. The preparation method comprises the following steps: taking commercial nano titanium dioxide as a catalytic main body, polyvinylpyrrolidone as a surfactant, methanol as a solvent, zinc nitrate / cobalt as a metal salt, 2-methylimidazole as an organic ligand and polystyrene nano microspheres as an etching template, preparing a porous metal organic framework ZIF-8 through a one-pot method, and taking the porous metal organic framework ZIF-8 as a carrier, highly uniformly dispersing the PVP modified nano titanium dioxide on the composite photocatalyst of the metal organic framework, enhancing the adsorption performance of the photocatalyst on VOCs in the photocatalytic degradation process, remarkably enhancing the photocatalytic oxidation performance on typical VOCs so that the problems that a traditional titanium dioxide photocatalyst is poor in adsorption performance and low in degradation efficiency are solved.

Description

technical field [0001] The invention relates to the technical field of environmental pollution control, in particular to the technical field of catalytic oxidation purification, in particular to the preparation of a composite photocatalyst and its application in VOCs purification. Background technique [0002] Volatile organic compounds (VOCs), as important gaseous pollutants, not only include many toxic and harmful substances, but also important precursors for the formation of organic aerosols, PM2.5 and ozone, which greatly affect environmental quality and human health. Photocatalytic oxidation can degrade toxic and harmful substances into harmless CO under light conditions 2 and H 2 O, has the characteristics of mild reaction conditions, low cost, high mineralization rate, wide application range, and less secondary pollution. It has important research significance for energy saving and emission reduction, reducing the generation of toxic particulate matter, and effective...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/38B01J31/22B01J37/03B01J37/16B01D53/86B01D53/72
CPCB01D53/007B01D53/8668B01D2255/802B01D2257/70B01D2257/7027B01D2257/708B01J31/1691B01J31/38B01J35/0013B01J35/004B01J37/031B01J37/16B01J2531/0213B01J2531/26B01J2531/845
Inventor 温美成张思远安太成李云飞周永毅李木子
Owner 紫科装备股份有限公司
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