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Multiwalled carbon nanotube-polyacrylonitrile composite ultrafiltration membrane and preparation method thereof

A technology of multi-walled carbon nanotubes and multi-walled nanotubes, applied in ultrafiltration, chemical instruments and methods, membranes, etc., can solve the problem of large interchain force between polymer chains, poor wear resistance and fatigue resistance, and poor pollution resistance. and other problems, to achieve the effects of good electromagnetic performance and adsorption performance, good support, and rapid selective separation

Inactive Publication Date: 2019-08-20
李文国
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

And because the polyacrylonitrile molecule contains a very polar cyano group, the force between the polymer chains is large, the flexibility is poor, and the mechanical strength is low, the wear resistance and fatigue resistance are poor, and the pollution resistance is relatively poor. Poor weakness, which limits its application in the membrane field

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A multi-walled nanotube-polyacrylonitrile (MWCNT-PAN) composite ultrafiltration membrane, comprising the following raw materials in proportions by weight: 14 parts of polyacrylonitrile, 0.1 part of acidified multi-walled carbon nanotubes / Fe 3 o 4 / SiO 2, 72 parts of dimethylformamide, 12 parts of polyethylene glycol 400 and 0.05 part of sodium lauryl sulfate; the molecular weight of polyacrylonitrile is 100,000, and the purity is ≥93%; the purity of multi-walled carbon nanotubes is ≥95%, The diameter of multi-walled carbon nanotubes is 10-20nm, and the length is 5-20μm, Fe 3 o 4 and SiO 2 The mass ratio of 2:1; porogen and negative surfactant are analytically pure.

[0032] A method for preparing the above multi-walled nanotube-polyacrylonitrile (MWCNT-PAN) composite ultrafiltration membrane, comprising the following steps: (1) preparing acidified multi-walled carbon nanotubes / Fe 3 o 4 / SiO 2 ,

[0033] ① Multi-walled carbon nanotubes and mixed acid (V 硫酸 :V 硝...

Embodiment 2

[0040] A multi-walled nanotube-polyacrylonitrile (MWCNT-PAN) composite ultrafiltration membrane, comprising the following raw materials in parts by weight: 15 parts of polyacrylonitrile, 0.3 parts of acidified multi-walled carbon nanotubes / Fe 3 o 4 / SiO 2 , 72.5 parts of dimethylformamide, 13 parts of polyethylene glycol 400 and 0.1 part of sodium lauryl sulfate.

[0041] A method for preparing the above-mentioned multi-walled nanotube-polyacrylonitrile (MWCNT-PAN) composite ultrafiltration membrane, comprising the following steps: Referring to Example 1, the multi-walled carbon nanotubes and mixed acid are oscillatingly refluxed, filtered, and then washed to pH The value is 6.4, and the acidified multi-walled carbon nanotubes are obtained; the acidified multi-walled carbon nanotubes / Fe 3 o 4 ; with pure water, nano-silica and acidified MWCNT / Fe 3 o 4 Preparation of acidified multi-walled carbon nanotubes / Fe 3 o 4 / SiO 2 ; The molar ratio of ferric chloride hexahydrate...

Embodiment 3

[0043] A multi-walled nanotube-polyacrylonitrile (MWCNT-PAN) composite ultrafiltration membrane, including the following raw materials in parts by weight: 16 parts of polyacrylonitrile, 0.6 parts of acidified multi-walled carbon nanotubes / Fe 3 o 4 / SiO 2 , 73 parts of dimethylacetamide, 13.5 parts of polyvinylpyrrolidone and 0.15 parts of sodium alkylsulfonate.

[0044] A method for preparing the above-mentioned multi-walled nanotube-polyacrylonitrile (MWCNT-PAN) composite ultrafiltration membrane, comprising the following steps: Referring to Example 1, the multi-walled carbon nanotubes and mixed acid are oscillatingly refluxed, filtered, and then washed to pH The value is 6.5, and acidified multi-walled carbon nanotubes are obtained; acidified multi-walled carbon nanotubes / Fe are prepared with pure water, ferric chloride hexahydrate, ferrous sulfate heptahydrate, acidified multi-walled carbon nanotubes and lye 3 o 4 ; with pure water, nano-silica and upper chemical multi-w...

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Abstract

The invention relates to the field of preparation of modified ultrafiltration membranes, and in particular relates to a multiwalled carbon nanotube-polyacrylonitrile (MWCNT-PAN) composite ultrafiltration membrane and a preparation method thereof. The MWCNT-PAN composite ultrafiltration membrane comprises the following raw materials, in parts by weight: 14-17 parts of a membrane substrate, 0.1-1.0part of acidified multiwalled carbon nanotube / Fe3O4 / SiO2, 72-75 parts of a solvent, 12-15 parts of a pore-forming agent and 0.05-0.3 part of an anionic surfactant. According to the method provided bythe invention, the MWCNT-PAN composite ultrafiltration membrane prepared by the method not only can remove harmful heavy metal ions in water, such as Cr<3+>, Pb<2+> and Zn<2+>, but also has the advantages of strong mechanical properties, excellent anti-fouling performance, high water flux, an excellent retention rate and a long usage period.

Description

technical field [0001] The invention relates to the field of preparation of modified ultrafiltration membranes, in particular to a multi-wall nanotube-polyacrylonitrile (MWCNT-PAN) composite ultrafiltration membrane and a preparation method thereof. Background technique [0002] Separation membrane is a kind of membrane material with selective permeability. Generally, according to the separation mechanism and scope of application, it can be divided into microfiltration membrane, ultrafiltration membrane, nanofiltration membrane, reverse osmosis membrane and ion exchange membrane. Ultrafiltration membrane is a microporous filtration membrane with consistent pore size and rated pore size below 0.01 μm. Appropriate pressure is applied on one side of the membrane to screen out solute molecules smaller than the pore size of the membrane to separate particles with a molecular weight greater than 500 Daltons and a particle size greater than 10nm; the ultrafiltration membrane is on...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D69/12B01D69/02B01D67/00B01D61/14
CPCB01D61/145B01D67/0079B01D69/02B01D69/12B01D71/021B01D71/42B01D2311/2626B01D2325/46B01D2325/48
Inventor 李文国
Owner 李文国
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