Method for preparing natural polyelectrolyte nanofiltration membrane

A technology of polyelectrolyte and nanofiltration membrane, which is applied in the direction of chemical instruments and methods, membrane, membrane technology, etc., can solve the problems of reducing swelling effect, achieve the effect of low cost, simple and novel preparation method, and good hydrophilicity

Active Publication Date: 2018-03-06
JIANGSU TIANHE PHARMA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, chitosan, as a natural polysaccharide, has a huge yield. The quaternary ammonium salt can be obtained by modifying the natural polysaccharide. While improving the water solubility and the concentration of charged groups, the hydrogen bond and hydrophobic interaction between the polysaccharide and the polysaccharide can be utilized. Action, entanglement, etc. to form a three-dimensional network structure, reducing its swelling effect

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Prepare a 5% glutaraldehyde aqueous solution, drop hydrochloric acid solution to adjust its pH value to about 3, treat the polysulfone bottom membrane with 5% glutaraldehyde aqueous solution for 2 minutes, dry in the shade, and then quaternary ammonium salt cationic cellulose Ether / chitosan quaternary ammonium salt / polyvinyl alcohol aqueous solution was coated on the pretreated film for 1 min, and the resulting composite film was treated at 90°C for 2 h, wherein the mass fraction of polyvinyl alcohol was 0.3%, quaternary ammonium salt cationic cellulose The mass fraction of ether is 2%, and the mass fraction of chitosan quaternary ammonium salt is 3%.

[0022] For sodium sulfate, MgCl 2、 The sewage solution of NaCl was tested, and the test results showed that the prepared nanofiltration membrane had a rejection of 55% to 2000ppm sodium sulfate, and a rejection of 2000ppm MgCl 2 92% rejection for NaCl and 32% for NaCl.

Embodiment 2

[0024] Prepare a 5% glutaraldehyde aqueous solution, drop hydrochloric acid solution to adjust its pH value to about 3, treat the polysulfone bottom membrane with 5% glutaraldehyde aqueous solution for 4 minutes, dry in the shade, and then add quaternary ammonium salt cationic cellulose Ether / chitosan quaternary ammonium salt / polyvinyl alcohol aqueous solution was coated on the pretreated film for 1 min, and the resulting composite film was treated at 90°C for 2 h, wherein the mass fraction of polyvinyl alcohol was 0.3%, quaternary ammonium salt cationic cellulose The mass fraction of ether is 3%, and the mass fraction of chitosan quaternary ammonium salt is 2%.

[0025] For sodium sulfate, MgCl 2、 The sewage solution of NaCl was tested, and the test results showed that the prepared nanofiltration membrane had a retention rate of 65% for 2000ppm sodium sulfate, a retention rate of 67% for 2000 ppm MgCl2, and a retention rate of 40% for NaCl.

Embodiment 3

[0027] Prepare a 5% glutaraldehyde aqueous solution, drop hydrochloric acid solution to adjust its pH value to about 3, treat the polysulfone bottom membrane with 5% glutaraldehyde aqueous solution for 4 minutes, dry in the shade, and then add quaternary ammonium salt cationic cellulose Ether / chitosan quaternary ammonium salt / polyvinyl alcohol aqueous solution was coated on the pretreated film for 1 min, and the resulting composite film was treated at 90°C for 2 h, wherein the mass fraction of polyvinyl alcohol was 0.3%, quaternary ammonium salt cationic cellulose The mass fraction of ether is 1%, and the mass fraction of chitosan quaternary ammonium salt is 4%.

[0028] For sodium sulfate, MgCl 2、 The sewage solution of NaCl was tested, and the test results showed that the prepared nanofiltration membrane had a retention rate of 47% for 2000ppm sodium sulfate, a retention rate of 95% for 2000 ppm MgCl2, and a retention rate of 30% for NaCl.

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Abstract

The invention discloses a method for preparing a natural polyelectrolyte nanofiltration membrane and belongs to the technical field of preparation of membrane materials. According to the method disclosed by the invention, a quaternary ammonium cation cellulose ether and a quaternized chitosan blend form an ultra-thin separation layer material, polyvinyl alcohol serves as a casting solution additive, and polysulfone serves as a supporting layer material; two kinds of natural polyelectrolyte serve as a membrane material, and a cross-linking agent is added, so that the two polymers are cross-linked to form a spatial semi-interpenetrating network structure, the polymer networks are mutually tangled, and therefore, the membrane structure stability is enhanced. Meanwhile, the natural polyelectrolyte charged nanofiltration membrane has an antibacterial group capable of inhibiting and killing bacterium components in water, while the membrane structure is provided with many hydrophilic groups,and the hydrophilic property on the membrane surface is excellent. Meanwhile, the raw materials are readily available, the cellulose belongs to renewable resources, the chitosan belongs to natural polysaccharides, any risk of environmental pollution is avoided, and the preparation method is convenient and practical.

Description

technical field [0001] The invention relates to a preparation method of a polymer material membrane, in particular to a preparation method of a natural polyelectrolyte nanofiltration membrane, and belongs to the technical field of membrane material preparation. Background technique [0002] Nanofiltration is a new type of membrane separation technology. The relative molecular mass of the nanofiltration membrane is between 200-2000. Usually, the surface of the nanofiltration membrane can be positively or negatively charged, and the operating pressure is low. The modified charged nanofiltration Membrane, due to the charge on its surface, can not only intercept high-priced counter-electricity ions, but also intercept amino acids and proteins, etc., and has good application prospects in sewage treatment, seawater desalination and water recycling; its preparation method is conventional The most common method is to use one polymer to make a porous support membrane, and then use an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/74B01D69/02B01D67/00
CPCB01D67/0002B01D69/02B01D71/74B01D2325/26B01D2325/36
Inventor 杨南松倪银华陆华平殷义平
Owner JIANGSU TIANHE PHARMA CO LTD
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