Method for preparing anti-pollution chitosan-nonwoven cloth composite porous filter membrane

A porous filter membrane and chitosan technology, which is used in the preparation of ultrafiltration composite membranes and in the field of microfiltration to achieve good mechanical stability and chemical stability, improve firmness, and uniform membrane pore size.

Inactive Publication Date: 2009-08-05
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, chitosan composite separation membra...

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 0.1g chitosan is dissolved in 50ml mass percentage and is 2% acetic acid aqueous solution, is mixed with the chitosan acetic acid solution that mass percentage is 0.2%, adds mole percentage and is 0.1% glutaraldehyde as cross-linking agent, adds 0.1g average Polyethylene glycol with a molecular mass of 20,000 was used as an additive, stirred evenly, and cross-linked at 45°C for 30 minutes. The 0.5 micron pore size melt-blown polypropylene non-woven fabric membrane is soaked in a 50% glutaraldehyde solution for 24 hours, dried, and the pretreated polypropylene non-woven fabric base membrane is placed in a filter, 50ml casting film Liquid is added to the filter, coated on the surface and pores of the non-woven fabric under the negative pressure of 20KPa, dried in an oven to constant weight, soaked in 2% sodium hydroxide aqueous solution for 30 minutes, and then placed in Boil in a hot water bath at 90°C for 5 hours, and finally rinse with clean water.

Embodiment 2

[0026] 5g chitosan is dissolved in 50ml mass percentage and is 2% acetic acid aqueous solution, is mixed with the chitosan acetic acid solution that mass percentage is 10%, adds mole percentage and is 10% glutaraldehyde as cross-linking agent, adds 1g average molecular mass 20000 polyethylene glycol was used as an additive, stirred evenly, and cross-linked at 80°C for 1 hour. Melt-blown polypropylene non-woven fabric membrane with a pore size of 5 microns is soaked in a 50% glutaraldehyde solution for 24 hours, dried, and the pretreated polypropylene non-woven fabric base membrane is placed in a filter, 50ml casting film Liquid is added to the filter, coated on the surface and pores of the non-woven fabric under the negative pressure of 40KPa, dried in an oven to constant weight, soaked in an aqueous sodium hydroxide solution with a mass concentration of 2% for 30 minutes, and then placed in Boil in a hot water bath at 90°C for 5 hours, and finally rinse with clean water.

Embodiment 3

[0028] Dissolve 1g of carboxymethyl chitosan in 50ml of deionized aqueous solution, add 0.5% glutaraldehyde as a cross-linking agent in molar percentage, add polyethylene glycol with an average molecular weight of 5000 as an additive, stir well, and heat at 80°C Cross-linking reaction for 1 hour. The melt-blown polypropylene non-woven fabric membrane with a diameter of 5 cm was soaked in 50 wt% glutaraldehyde solution for 24 hours, the pretreated polypropylene non-woven fabric base film was placed in the filter, and 50ml of casting solution was added to the filter , under the negative pressure of 20KPa, it is coated on the surface of the non-woven fabric and in the pores, dried in an oven to constant weight, soaked in a 2% sodium hydroxide aqueous solution for 30 minutes, and then placed in a hot water bath at 70°C Boil for 5 hours, and finally rinse with clean water.

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Abstract

The invention discloses a method for preparing an antipollution chitosan-nonwoven fabric composite porous filter membrane and belongs to the technical field of microfilter and ultrafilter composite membranes. The method is characterized in that the method adopts nonwoven fabric with nominal aperture of between 0.1 and 10 microns as a base membrane; a crosslinking agent is adopted to carry out pretreatment on the base membrane; 0.1 to 10 mass percent amylose is dissolved in an acetic acid solution; the crosslinking agent and a hole formation agent are added into the acetic acid solution; after the crosslinking reaction, a casting film liquid is obtained; at negative pressure, the casting film liquid is evenly coated on the surface and pores of the porous base membrane; and after treatment by a sodium hydroxide solution and a hot water bath, the antipollution chitosan-nonwoven fabric composite porous filter membrane is formed. The method has the advantages that the prepared composite membrane has good mechanical performance and chemical stability; and the surface of the membrane is levelled and smooth. The composite membrane has dual functions of hydrophile and antibiosis, can lighten adsorption of pollutants on the surface of the membrane, inhibit the growth and reproduction of thalli on the surface of the membrane, and keep the penetrating performance of the membrane and is widely applied to the water treatment process of various fields.

Description

technical field [0001] The invention belongs to the technical field of preparation of microfiltration and ultrafiltration composite membranes, and relates to a preparation method of an anti-pollution chitosan-nonwoven composite porous filtration membrane. Background technique [0002] Due to the outstanding advantages of membrane separation technology, it has recently made great progress in the application of advanced sewage treatment, biochemistry, medicine, beverages and other fields. Membrane fouling is the primary problem affecting the membrane separation process. Membrane fouling will lead to clogging of membrane pores, decrease in membrane flux, and difficulty in cleaning and recovery. It is the bottleneck in the development of membrane separation technology. The main membrane fouling in the water treatment process includes colloidal particle fouling and microbial fouling. The antifouling modification of membranes mainly focuses on hydrophilic modification, and the pr...

Claims

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Application Information

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IPC IPC(8): B01D69/12B01D71/08
Inventor 王婵婵杨凤林安鹏薛源
Owner DALIAN UNIV OF TECH
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