Preparation method of glycine betaine colloid nano particle modified chitosan nanofiltration membrane

A nanoparticle and betaine technology, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems that restrict long-term stable work, nanofiltration membrane pollution, etc., achieve good industrial applicability, low cost, Simple and safe preparation process

Active Publication Date: 2013-09-25
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing nanofiltration membranes of chitosan and its derivatives have not yet achieved the separation performance of high salt rejection and high water permeation flux; in addition, in the actual separation application process, the pollution problem of nanofiltration membranes is The key to restricting its long-term stable work

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0016] The steps of the preparation method of betaine colloidal nanoparticles modified chitosan nanofiltration membrane are as follows:

[0017] 1) Prepare betaine colloidal nanoparticles by using betaine olefin monomer and hydroxyalkyl acrylate monomer as functional monomers, making an aqueous solution, adding a water-soluble oxidation-reduction initiator, and adopting a soap-free emulsion polymerization method;

[0018] 2) Uniformly disperse chitosan and betaine colloidal nanoparticles in an aqueous solution containing inorganic acid, add a cross-linking agent, and make a casting solution; o Under the condition of temperature of C and relative air humidity of 50-60%, the above-mentioned casting solution is evenly coated on the polysulfone ultrafiltration membrane, and placed at 40-60 o In the baking oven of C for 2~4 hours, obtain betaine colloidal nanoparticles modified chitosan nanofiltration membrane;

[0019] Step 1) The betaine-based olefin monomer is 3-[N,N-dimethyl-[...

Embodiment 1

[0026] Take 15g of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and 5g of hydroxyethyl acrylate In 100ml of water, nitrogen gas was introduced, and potassium persulfate and sodium bisulfite (mass ratio 1:1) were added with a concentration of 1% by mass percentage, at 30 o Carry out soap-free emulsion polymerization under C for 6 hours, after repeated centrifugation, washing, and vacuum drying, obtain betaine colloidal nanoparticles; 0.1g of the above nanoparticles, 0.5 g chitosan (molecular weight 50,000, deacetylation degree 85%) ), 0.1g of hydrochloric acid and 0.2g of glutaraldehyde were added to 100 ml of water and dissolved to obtain a clear and transparent casting solution; at 20 o C and 50% air relative humidity conditions, the above-mentioned casting solution is evenly coated on the polysulfone ultrafiltration membrane, and then it is placed in 40 o In the baking oven of C for 4 hours, obtain betaine colloidal nanoparti...

Embodiment 2

[0028] Take 35g of 3-[N,N-dimethyl-[2-(2-methylprop-2-enoyloxy)ethyl]ammonium]propane-1-sulfonic acid inner salt and 15g of hydroxyethyl acrylate and add In 100ml of water, nitrogen gas was introduced, and potassium persulfate and sodium bisulfite (mass ratio 1:1) were added with a mass percent concentration of 3%, at 50 o Soap-free emulsion polymerization was carried out at C for 2 hours, after repeated centrifugation, water washing, and vacuum drying, betaine colloidal nanoparticles were obtained; 1 g of the above nanoparticles, 2 g of chitosan (molecular weight: 200,000, deacetylation degree: 95%) , 0.3g hydrochloric acid and 0.5g glutaraldehyde were added into 100 ml of water and dissolved to obtain a clear and transparent casting solution; at 30 o C and 60% air relative humidity conditions, the above-mentioned casting solution is evenly coated on the polysulfone ultrafiltration membrane, and then it is placed in 60 o C in the oven for 2 hours to obtain the betaine colloi...

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Abstract

The invention discloses a preparation method of a glycine betaine colloid nano particle modified chitosan nanofiltration membrane which comprises a porous polysulfone support layer and a functional layer formed by glycine betaine colloid nano particle modified chitosan. The preparation method comprises the steps of: firstly, carrying out solution polymerization reaction to obtain a glycine betaine colloid nano particle; and then preparing the nano particle, chitosan and a cross-linking agent into a water solution with a certain concentration, dipping one layer of water solution on the surface of the porous polysulfone support layer, and then curing and crosslinking to obtain the nanofiltration membrane. According to the nanofiltration membrane, under the operation pressure of 0.6MPa, the water flux is 25-35L.m<-2>.h<-1>, the retention rate of divalent cations is generally higher than 97 percent, and the retention rate of monovalent salts is lower than 60 percent; meanwhile, the nanofiltration membrane shows good pollution resistance. Therefore, the prepared glycine betaine colloid nano particle modified chitosan nanofiltration membrane has high permeation selectivity and pollution resistance; the preparation method is simple and easy to operate and low in cost, and has a good industrialized application prospect.

Description

technical field [0001] The invention belongs to the field of nanofiltration membrane separation, and in particular relates to a preparation method of chitosan nanofiltration membrane modified by betaine colloidal nanoparticles. Background technique [0002] Nanofiltration is a new pressure-driven membrane separation process developed in the late 1980s. The pore size range of nanofiltration membrane is about 1-5nm, which is a kind of separation membrane between reverse osmosis membrane and ultrafiltration membrane. According to the chargeability of membrane materials, nanofiltration membranes can be divided into negatively charged nanofiltration membranes, positively charged nanofiltration membranes and charged mosaic nanofiltration membranes. At present, commercial nanofiltration membranes mainly include negatively charged polyamide membranes, cellulose acetate membranes, and sulfonated polyethersulfone membranes. However, with the increase of actual separation systems, po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/08B01D67/00
Inventor 安全福计艳丽赵凤阳高从堦
Owner ZHEJIANG UNIV
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