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Compound filter material and preparing method and performance testing method thereof

A composite filter material and performance technology, applied in separation methods, chemical instruments and methods, filtration and separation, etc., can solve the problems of large particle size and difficult high-efficiency filtration.

Active Publication Date: 2019-07-30
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Filter materials such as glass fiber, quartz fiber, cellulose fiber and electret fiber, which are commonly used for particulate matter filtration, cannot absorb and remove gases because they do not contain micropores (<2nm) or mesopores (2-50nm); Adsorbents such as activated carbon, molecular sieve, alumina, and mesoporous materials are difficult to efficiently filter particulate matter due to their large particle size and spherical columnar shape

Method used

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  • Compound filter material and preparing method and performance testing method thereof
  • Compound filter material and preparing method and performance testing method thereof
  • Compound filter material and preparing method and performance testing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0138] refer to figure 1 , the present embodiment proposes that the preparation process of the composite filter material containing nanofibers is:

[0139] Fix the load base on the rollers and start the rollers;

[0140] Fill the dimethylformamide solution of polyacrylonitrile into the electrospinning solution cavity, spray it to the roller, and generate nanofibers on the loading base;

[0141] Put the adsorbent solution into the electrospray solution chamber, spray to the roller, and load the adsorbent on the load base until the adsorbent solution is sprayed completely;

[0142] Stop the roller, let it dry, and curve the fiber cloth on the roller to finally obtain the composite filter material containing nanofibers.

[0143] The rotating speed of the roller is 10r / min.

[0144] The mass fraction of polyacrylonitrile in the dimethylformamide solution of polyacrylonitrile is 10%.

[0145] The adsorbent solution is obtained by dissolving the adsorbent in an isopropanol solut...

Embodiment 2

[0168] The preparation method of the composite filter material without nanofibers of the present embodiment is basically the same as that of Example 1, the only difference is:

[0169] The adsorbent used is ZSM-5 molecular sieve.

[0170] Spray 40mg and 10mg of ZSM-5 powdered molecular sieves onto the fiber substrate, respectively, to prepare adsorbents with loading masses per unit area of ​​0.80 and 0.20mg / cm 2 The loading ratios of samples No. 1 and No. 2 are 85% and 75%, respectively.

[0171] According to the performance test method of a composite filter material described in Example 1, the performance tests were performed on sample No. 1 and sample No. 2 respectively.

[0172] The test conditions are:

[0173] The gas to be measured is ozone, and the ozone concentration is 600ppb.

[0174] Experimental results such as Figure 9 The comparison chart of the ozone removal efficiency of the two composite filter materials with different adsorbent loading mass is shown, fro...

Embodiment 3

[0176] According to the performance testing method of a kind of composite filter material of implementation case 1, the loading mass per unit area of ​​the adsorbent containing and not containing nanofibers is 0.40 mg / cm 2 (80% load rate,) performance test of the composite filter material, the test conditions are:

[0177] The particle size range of the particle to be measured is 0-300nm.

[0178] Experimental results such as Figure 10 The ozone removal efficiency comparison chart of the two composite filter materials with and without nanofibers is shown. From this figure, it can be obtained that the particulate matter efficiency curve of the composite filter material with nanofibers is above the efficiency curve of the composite filter material without nanofibers , indicating that nanofibers contribute to the removal of particulate matter.

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Abstract

The invention belongs to the field of compound filter materials, and particularly relates to a compound filter material and a preparing method and performance testing method thereof. The preparing method of the compound filter material comprises a series of steps of dispersing an adsorbent through an electrospray method, a small-particle disperser method or a fluidized bed method, spraying a polymer through an electrospinning method to form nanometer fibers, and loading the nanometer fibers on a coarse loaded substrate. The testing method of the compound filter material comprises the steps that ozone and nanometer particulate matter are generated through an ozone generating unit and a particulate matter generating unit respectively, under the push of airflow, the ozone and the nanometer particulate matter flow through a filter paper holder loaded with the compound filter material and a filter paper holder without the compound filter material, the tail ends detect the concentration of the ozone and the particle size and concentration of the particulate matter respectively to obtain an efficiency curve of desorbing of the ozone and the particulate matter by the compound filter material, and then the absorption performance of the compound filter material is improved.

Description

technical field [0001] The invention belongs to the field of composite filter materials, in particular to a composite filter material and its preparation method and performance testing method, including the preparation methods of various composite filter materials, and a performance test method for synchronous removal of gas and particulate matter is designed to determine its performance to test. Background technique [0002] At present, the air passenger flow is increasing year by year, and the environmental quality in the cabin is receiving more and more attention. The main pollutants in the cabin are particulate matter, microorganisms and ozone. Ozone-induced surface and gas reactions can lead to secondary emissions of particulate matter and volatile organic compounds (VOCs), which can be more harmful than ozone itself. Therefore, it is necessary to remove PM and ozone in the environment. [0003] Generally, the removal of nanoparticles in the cabin mainly depends on t...

Claims

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Application Information

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IPC IPC(8): B01D39/14B01D46/00B01D46/54G01N15/08
CPCB01D39/14B01D46/0036B01D46/546B01D2239/025B01D2239/0407B01D2239/10G01N15/08G01N2015/084G01N2015/0866
Inventor 李子宜金成赞包丹琪裴有康刘应书
Owner UNIV OF SCI & TECH BEIJING
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