Functionalized graphene modified air filter membrane and preparation method thereof

An air filtration and fossil technology, applied in chemical instruments and methods, filtration separation, separation methods, etc., can solve the problems of high air pressure drop, discomfort, single function, etc., to improve filtration efficiency, reduce air resistance, overcome pressure. drop effect

Inactive Publication Date: 2018-01-16
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The existing filter membranes for making masks on the market are mainly made of simple non-woven fabrics, which have a single function and cannot meet people's needs for masks with low air resistance and high efficiency in

Method used

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  • Functionalized graphene modified air filter membrane and preparation method thereof
  • Functionalized graphene modified air filter membrane and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step A, prepare by the improved Hummer method Graphene oxide , Centrifugal washing and drying.

[0023] Step B, prepare 0.5mg graphene oxide / polyacrylonitrile N,N-dimethylformamide dispersion, weigh 1g polyacrylonitrile, then weigh 0.5mg graphene oxide, add 10mLN,N-dimethylformamide In the amide, stir and ultrasonic to disperse the precursor liquid evenly.

[0024] Step C. Place the aluminum foil on the electrospin receiver and place the non-woven fabric substrate on top of it.

[0025] Step D, place the prepared precursor solution on the electrospinning equipment with a syringe, the needle tip is 20.5cm away from the receiver, the voltage is 12.5kV, the advancing speed is 0.8mm / min, and 0.5mg graphene oxide The modified polyacrylonitrile composite polymer film is spun on the non-woven fabric to form a layer of dense nanofiber composite film.

Embodiment 2

[0027] Step A, prepare reduced graphene oxide, centrifuge, wash and freeze-dry.

[0028] Step B. Prepare 0.25 mg reduced graphene oxide / bisphenol A polysulfone xylene dispersion, weigh 1.5 g bisphenol A polysulfone, then weigh 0.25 mg reduced graphene oxide, add to 10 mL xylene, and stir Ultrasonic to disperse the precursor liquid evenly.

[0029] Step C, placing the aluminum foil on the electrospinning receiving substrate, and disposing the nonwoven on it.

[0030] Step D, place the prepared precursor solution on the electrospinning equipment with a syringe, the needle tip is 18cm away from the receiver, the voltage is 15kV, and the advancing speed is 1mm / min, and 0.25mg of reduced graphene oxide modified The bisphenol A polysulfone composite polymer membrane is spun on the non-woven fabric to form a dense nanofiber composite membrane.

Embodiment 3

[0032] Step A, preparation of hydroxylated graphene, centrifugal washing and drying.

[0033] Step B. Prepare 5 mg of hydroxylated graphene / polyvinyl alcohol ethylene glycol dispersion, weigh 2 g of polyvinyl alcohol, then weigh 5 mg of hydroxylated graphene, add it to 10 mL of ethylene glycol, and stir ultrasonically to make the precursor solution evenly dispersed .

[0034] Step C, placing the aluminum foil on the electrospinning receiving substrate, and disposing the nonwoven on it.

[0035] Step D, put the prepared precursor solution on the electrospinning equipment with a syringe, the needle tip is 20cm away from the receiver, the voltage is 8kV, and the advancing speed is 0.6mm / min, and 5mg of hydroxylated graphene modified The polyvinyl alcohol composite polymer film is spun on the non-woven fabric to form a dense nanofiber composite film.

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PUM

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Abstract

The invention discloses a functionalized graphene modified air filter membrane and a preparation method thereof, and a high-efficiency and low-resistance nano fiber composite filter membrane. The composite filter membrane comprises two parts including a non-woven fabric substrate supporting layer and an electrostatic spinning composite fiber compact layer, functionalized graphene adjusts the structure of a compact separation layer, fiber and beaded structures generate a molecular slippage effect, and therefore air resistance of the filter membrane is remarkably reduced; and besides, the high surface area and abundant surface functional groups of the functionalized graphene improve the air filter efficiency of the filter membrane. The preparation method of the air filter membrane comprisesthe following steps: preparing a mixed solution of the functionalized graphene and a polymer with different concentrations, taking non-woven fabric as a receiving substrate, and preparing the nano fiber composite filter membrane by adopting an electrostatic spinning method. The filter membrane can filter fine particles in air such as smoke, pollen and PM2.5, realizes air purification, can also beused for personal protective devices (such as masks), and is beneficial for human health.

Description

technical field [0001] The invention relates to a modified nanofiber composite membrane for air filtration with low resistance, and belongs to the technical field of air filtration and membrane material preparation. Background technique [0002] In recent years, due to the impact of human production and life, global air pollution has become more and more serious, and air quality has attracted much attention. Severely polluted smog weather has occurred many times in many places in my country, among which PM 2.5 Fine particulate matter is an important factor that causes smog. Inhalation of smog into the human body will greatly increase the incidence of cardiovascular and cerebrovascular diseases and increase the mortality rate. Therefore, a low-resistance and high-efficiency filter for PM in the air is developed. 2.5 And the composite filter membrane of various pollutants, and it is very important to apply it in production and life. [0003] The existing filter membranes fo...

Claims

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Application Information

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IPC IPC(8): B01D46/54B01D39/16
Inventor 朱宏伟李晶
Owner TSINGHUA UNIV
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