Preparation method of self-assembly covalent cross-linked sodium filter membrane

A covalent cross-linking, nanofiltration membrane technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve the increase in the use cost and operating cost of membrane modules, reduce filtration efficiency and membrane water production, increase The number of membrane replacements and other issues can enhance the anti-biological fouling ability, good effect, high solvent resistance and stability.

Active Publication Date: 2013-07-31
OCEAN UNIV OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Membrane biofouling reduces membrane filtration efficiency and membrane water production, and at the same time increases membrane cleaning frequenc

Method used

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  • Preparation method of self-assembly covalent cross-linked sodium filter membrane
  • Preparation method of self-assembly covalent cross-linked sodium filter membrane
  • Preparation method of self-assembly covalent cross-linked sodium filter membrane

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] The base membrane used in the present invention is a polyacrylonitrile (PAN) membrane with a molecular weight cut-off of 50,000 Da (Dalton), a flat ultrafiltration membrane, and a membrane area of ​​28.26cm 2 ; The polyanionic electrolyte used is sodium polyacrylate (PAA, with a molecular weight of 100,000); the polycationic electrolyte used is polyethyleneimine (PEI, with a molecular weight of 60,000), and the molecular weight of glutaraldehyde (GA) is 100; The functional monomer N-(5-methyl-2 hydroxybenzyl)benzamide (HMBB) of the prime is made by the laboratory, and its preparation steps are as follows:

[0031] (1) Prepare a polycation electrolyte solution with absolute ethanol, wherein the mass percentage concentration of PEI is 0.4%, and the mass percentage concentration of HMBB is 0.25%;

[0032] (2) Prepare a PAA solution with a mass percent concentration of 0.25% with deionized water;

[0033] (3) Prepare a GA solution with a mass percent concentration of 0.5% ...

Embodiment 2

[0042] The base membrane, polycation electrolyte, and polyanion electrolyte used in this embodiment are the same as in Example 1, and the preparation steps are as follows:

[0043] (1) Prepare a polycation membrane-making solution with absolute ethanol, wherein the mass percentage concentration of PEI is 0.4%, and the mass percentage concentration of HMBB is 0.25%;

[0044] (2) Prepare a PAA solution with a mass percent concentration of 0.25% with deionized water;

[0045] (3) Prepare a GA solution with a mass percent concentration of 0.5% with deionized water;

[0046] (4) In order to charge the surface of the polyacrylonitrile-based membrane, the hydrolytic modification technology was used to immerse the polyacrylonitrile ultrafiltration membrane in 2N NaOH solution for 1 hour at a constant temperature of 65°C to modify it into a polyanion-based membrane. membrane;

[0047] (5) Rinse off the NaOH solution on the surface of the membrane with deionized water until the pH val...

Embodiment 3

[0054] The base membrane, polycation electrolyte, and polyanion electrolyte used in this embodiment are the same as in Example 1, and the preparation steps are as follows:

[0055] (1) Prepare a polycation membrane-making solution with absolute ethanol, wherein the mass percentage concentration of PEI is 0.4%, and the mass percentage concentration of HMBB is 0.25%;

[0056] (2) Prepare a PAA solution with a mass percent concentration of 0.25% with absolute ethanol;

[0057] (3) Prepare a GA solution with a mass percent concentration of 1% with deionized water;

[0058] (4) In order to charge the surface of the polyacrylonitrile-based membrane, the hydrolytic modification technology was used to immerse the polyacrylonitrile ultrafiltration membrane in 2N NaOH solution for 1 hour at a constant temperature of 65°C to modify it into a polyanion-based membrane. membrane;

[0059] (5) Rinse off the NaOH solution on the surface of the membrane with deionized water until the pH valu...

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Abstract

The invention belongs to the technical field of preparation of separating membranes and relates to a preparation method of a self-assembly covalent cross-linked sodium filter membrane. The preparation method comprises the following steps of: pre-treating a base membrane, so that the surface of the base membrane has a functional group capable of generating electrostatic interaction with polyelectrolyte; dissolving capsaicin functional monomers in a polyelectrolyte solution; soaking the base membrane in the polyelectrolyte solution; getting out of the base membrane, washing the surface of the base membrane and soaking the washed base membrane in the polyelectrolyte solution with opposite charges; getting out the membrane, washing the surface of the membrane and soaking the washed membrane in a dialdehyde cross-linking agent to obtain the self-assembly covalent cross-linked sodium filter membrane with antibacterial activity. The self-assembly cross-linked sodium filter membrane with antibacterial activity is simple in preparation process, good in self-assembly effect, low in preparation cost and production environment-friendly.

Description

Technical field: [0001] The invention belongs to the technical field of separation membrane preparation, and relates to a preparation method of a self-assembled covalently cross-linked nanofiltration membrane with bacteriostasis, which is prepared by blending capsaicin derivatives into a polyelectrolyte solution and self-assembled Form a nanofiltration membrane, and then realize the immobilization of capsaicin derivatives through cross-linking, and enhance the membrane stability of the nanofiltration membrane. Background technique: [0002] The pore size of the nanofiltration membrane is in the nanometer range, and its molecular weight cut-off is 200-1000. The membrane pore size corresponding to the relative molecular weight cut-off is 1-3nm. It is a membrane between reverse osmosis and ultrafiltration. Nanofiltration The membrane can intercept low molecular weight organics such as sugars and high-priced inorganic salts (such as MgSO 4 etc.), the rejection rate of monovalen...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D69/02B01D71/42
Inventor 苏保卫贾瑞王婷婷
Owner OCEAN UNIV OF CHINA
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