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Air filter material based on carbon nano tube and preparation method thereof

An air filter material, carbon nanotube technology, applied in the fields of filtration and separation, separation methods, chemical instruments and methods, etc., can solve the damage of the intrinsic properties of carbon nanotubes, increase the resistance of carbon nanotube membranes, and affect the carbon nanotube membranes. Quality and other issues, to achieve good industrial application prospects, avoid material size and shape limitations, and achieve the effect of good strength

Active Publication Date: 2015-05-20
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this process, the intrinsic properties of carbon nanotubes will be destroyed, affecting the quality of carbon nanotube films
In addition, the solvent volatilization process after film formation by suction filtration will shrink the carbon nanotube film and reduce the porosity, which will eventually lead to an increase in the resistance of the carbon nanotube film during air filtration; (2) direct growth of carbon nanotube film by gas phase method used as air filter material
This method needs to strictly control the growth conditions, and the membrane area currently prepared is very small, which is not conducive to industrialization

Method used

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  • Air filter material based on carbon nano tube and preparation method thereof
  • Air filter material based on carbon nano tube and preparation method thereof
  • Air filter material based on carbon nano tube and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Embodiment 1, take the quartz fiber filter medium as the base to prepare carbon nanotube air filter material

[0033] The quartz fiber filter media (such as figure 2 As shown in (a), the average diameter of the quartz fiber is 3 μm), placed in the heating section of the quartz sleeve (such as figure 1 position shown in middle 6); take ferrocene as catalyst, place the nozzle of quartz tube (such as figure 1 3), the temperature at the position of the catalyst during the reaction is 120°C; with argon and hydrogen as the protective atmosphere, ethylene as the carbon source, the ratio is argon: hydrogen: ethylene = 7: 1: 2, gas flow rate 3mm / s, heat up to 760°C, and react for 1 hour to obtain an air filter material based on carbon nanotubes, such as figure 2 Shown in (b), wherein the average diameter of carbon nanotubes is 25nm.

[0034] The scanning electron micrograph of the air filter material based on carbon nanotubes prepared by the present embodiment is as follows...

Embodiment 2

[0037] Embodiment 2, take carbon fiber filter medium as base preparation carbon nanotube air filter material

[0038] Place the carbon fiber filter medium (the average diameter of the carbon fiber is 5 μm, in the shape of folded cloth) in the heating section of the quartz sleeve (such as figure 1 position shown in middle 6); take ferrocene as catalyst, place the nozzle of quartz tube (such as figure 1 3), the temperature at the position of the catalyst during the reaction is 120°C; with argon and hydrogen as the protective atmosphere, ethylene as the carbon source, the ratio is argon: hydrogen: ethylene = 7: 1: 2, gas flow rate The temperature is 3 mm / s, the temperature is raised to 850° C., and the reaction is performed for 15 minutes to obtain an air filter material based on carbon nanotubes. The average diameter of the carbon nanotubes is 25 nm.

Embodiment 3

[0039] Embodiment 3, take the quartz fiber filter medium after folding as base preparation carbon nanotube air filter material

[0040] Place the folded quartz fiber filter medium (the average diameter of the quartz fiber is 3 μm) in the heating section of the quartz sleeve (such as figure 1 position shown in middle 6); take ferrocene as catalyst, place the nozzle of quartz tube (such as figure 1 3), the temperature at the position of the catalyst during the reaction is 120°C; with argon and hydrogen as the protective atmosphere, ethylene as the carbon source, the ratio is argon: hydrogen: ethylene = 7: 1: 2, gas flow rate The temperature is 3 mm / s, the temperature is raised to 760° C., and the reaction is performed for 1 hour to obtain an air filter material based on carbon nanotubes. The average diameter of the carbon nanotubes is 25 nm.

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Abstract

The invention discloses an air filter materials based on a carbon nano tube and a preparation method thereof. The method comprises the following steps: taking a fibre filter medium as a substrate, and preparing the carbon nano tube on the substrate according to chemical vapor deposition method to obtain the product. The fibre filter medium is made of at least one of the group consisting of quartz fibre, carbon fiber, glass fibre, metal fibre and polymer fiber; according to the invention, the air filter materail based on the carbon nano tube comprises two-level structure so as to solve the problem that the intensity of the carbon nano tube membre is too low as air filter materails, the bulk density is too high, the resistance is too much and the clogging capacity is low, and to implement preparation for high-intensity, high-clogging-capacity, high-efficiency and low-resistance air filter material.

Description

technical field [0001] The invention relates to an air filter material based on carbon nanotubes and a preparation method thereof, belonging to the technical field of air filter technology and material preparation thereof. Background technique [0002] Particulate matter is the most common pollutant in the atmosphere. Studies have shown that the smaller the particle size, the greater the harm to human health. This is because small particles can deposit in the human lungs and even the blood circulation system, causing respiratory diseases or thrombus; Harm to human body. At present, my country is starting to formulate air quality monitoring standards for PM2.5 (that is, particulate pollutants with a diameter of less than or equal to 2.5 μm in the air), while some European countries have begun to implement PM0. particulate pollutants) air quality monitoring standards. It can be seen that the problem of fine particle pollutants in the air has attracted more and more attention...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D39/14
Inventor 魏飞李朋张莹莹张如范
Owner TSINGHUA UNIV
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