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Preparation method and application of composite aerogel filter disc

A composite aerogel and filter technology, applied in the field of composite aerogel filter preparation, can solve the problems of insufficient mechanical properties of the filter material, endanger the ecological environment, low adsorption capacity, etc., achieve good strength, and avoid secondary pollution. , the effect of improving brittleness

Inactive Publication Date: 2021-11-30
ZHEJIANG FORESTRY UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, some filter materials have insufficient mechanical properties and are difficult to be widely used, or their adsorption capacity is relatively low, or they are limited by environmental protection. Discarded membrane filters will endanger the ecological environment and cause secondary pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A preparation method of a composite airgel filter, comprising the steps of:

[0028] 1) Disperse nanocellulose fibers (CNF) in deionized water, stir evenly at room temperature, and obtain a 3wt% CNF suspension;

[0029] 2) Dispersing polyvinyl alcohol (PVA) in deionized water, stirring at 85°C until completely dissolved, to obtain a 5wt% PVA aqueous solution;

[0030] 3) Disperse 30 grams of BAC in 1.5 L of deionized water and soak for 24 hours to fully moisten and swell, and filter to remove impurities mixed in activated carbon. BAC was dispersed in deionized water, and the BAC aqueous suspension was mechanically ground using an ultrafine particle mill (Masukosangyo Co., LTD., Kawaguchi / Saitama, Japan). 150nm and -180nm, repeated grinding 5 times to obtain BAC nanoparticles;

[0031] 4) Add the BAC nanoparticles after step 3) to the CNF suspension at room temperature, and then add the PVA aqueous solution to obtain a CNF / PVA / BAC mixed suspension, the mass ratio of ea...

Embodiment 2

[0034] A preparation method of a composite airgel filter, comprising the steps of:

[0035] 1) Disperse CNF in deionized water and stir evenly at room temperature to obtain a 5wt% CNF suspension;

[0036] 2) Dispersing polyvinyl alcohol (PVA) in deionized water, stirring at 85°C until completely dissolved, to obtain a 10wt% PVA aqueous solution;

[0037] 3) Disperse 40 g of BAC in 1.5 L of deionized water and soak for 24 hours to make it swell and soften, and filter to remove impurities on the activated carbon. Disperse BAC in deionized water, mechanically grind the BAC water suspension with an ultrafine pulverizer, select and set the distance between the grinding discs between the mills to -80nm, -120nm, -150nm and -180nm, and repeat the grinding 5 times to obtain BAC nanoparticles ;

[0038] 4) Add the BAC nanoparticles after step 3) to the CNF suspension at room temperature, and then add the PVA aqueous solution to obtain a CNF / PVA / BAC mixed suspension, the mass ratio of ...

Embodiment 3

[0041] A preparation method of a composite airgel filter, comprising the steps of:

[0042] 1) Disperse CNF in deionized water and stir evenly at room temperature to obtain a 1wt% suspension;

[0043] 2) Disperse PVA in deionized water, stir at 85°C until completely dissolved, and obtain a 7wt% PVA aqueous solution;

[0044]3) First disperse 50g of BAC in 1.5L of deionized water and soak for 24 hours to make it fully moisten, and filter to remove impurities mixed in the activated carbon. Disperse BAC in deionized water, mechanically grind the BAC water suspension with an ultrafine pulverizer, select and set the distance between the grinding discs between the mills to -80nm, -120nm, -150nm and -180nm, and repeat the grinding 5 times to obtain BAC nanoparticles ;

[0045] 4) Add the BAC nanoparticles after step 3) to the CNF suspension at room temperature, and then add the PVA aqueous solution to obtain a CNF / PVA / BAC mixed suspension, the mass ratio of each component of the su...

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PUM

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Abstract

The invention relates to a preparation method and application of a composite aerogel filter disc, and the preparation method comprises the following steps: S1, preparing a CNF/PVA/BAC mixed suspension: adding BAC nanoparticles into the CNF suspension at room temperature, then adding a PVA aqueous solution to prepare the CNF/PVA/BAC mixed suspension according to the mass ratio of CNF: PVA: BAC being equal to 1: (0.1-1.0): (0.5-2.0), and adding deionized water to prepare 0.05-2.5 wt% of CNF; and S2, preparing a CNF/PVA/BAC composite aerogel filter disc: performing ultrasonic treatment on the CNF/PVA/BAC mixed suspension liquid treated in the S1 in an ice bath for 10 minutes by using an ultrasonic processor, then transferring the mixed suspension into a culture dish, and performing pre-freezing by using liquid nitrogen or an ultralow-temperature refrigerator; a freeze drying process is adopted, the temperature ranges from minus 80 DEG C to minus 40 DEG C, the vacuum degree ranges from 0.5 Pa to 3 Pa, the drying time ranges from 48h to 80h, and the CNF/PVA/BAC composite aerogel filter disc is obtained. The invention aims to provide the novel filter disc with the filtering efficiency of 95-98%.

Description

technical field [0001] The invention relates to the technical field of airgel filters, in particular to a preparation method and application of a composite airgel filter. Background technique [0002] With the rapid development of modern industry, air pollutants are becoming more and more serious. Among them, fine particulate matter (PM2.5) poses a threat to human health. Capturing PM2.5 has a broad background and far-reaching significance. Before the source of pollution is not well controlled, it is a practical method to purify the air with an air membrane filter until most of the PM2.5 is eliminated and prevent the harm of PM2.5 to the human body. The methods for air purification and filtration of PM2.5 mainly include mechanical filtration, adsorption, photocatalytic oxidation and ozone oxidation. Due to the advantages of simple operation, low cost, and high collection efficiency, mechanical filtration is widely used in scenarios with low pollutant concentrations. Mechan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/28B01J20/26B01J20/30B01J13/00B01D39/14B01D39/16B01D39/20
CPCB01J20/28047B01J20/28033B01J20/24B01J20/28007B01J20/20B01J20/261B01J13/0091B01D39/14B01D39/1623B01D39/2058B01D39/1615B01D2239/10B01D2239/0407B01D2239/0609B01D2239/0618
Inventor 黄景达张文标赵柯豫吴强
Owner ZHEJIANG FORESTRY UNIVERSITY
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