Method for preparing polyvinyl alcohol nanofiltration membrane with high rejection coefficient

A technology of polyvinyl alcohol and retention rate, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc., can solve problems such as insignificant interception effect of nanofiltration membrane, shedding of polyvinyl alcohol, and water swelling, etc., to achieve The preparation method is simple and novel, the effect of high retention rate and good hydrophilicity

Inactive Publication Date: 2011-06-15
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The retention effect of the nanofiltration membrane prepared by direct coating with polyvinyl alcohol is not obvious, and it is easy to swell with wa

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

Example 1

A glutaraldehyde aqueous solution with a mass fraction of 2% was prepared, and hydrochloric acid solution was added dropwise to adjust the pH value to about 4. The polysulfone bottom membrane was treated with a 2% glutaraldehyde aqueous solution for 2 minutes, dried in the shade, and then the polysulfone bottom membrane was treated with a 2% glutaraldehyde aqueous solution for 2 minutes. The polyvinyl alcohol aqueous solution was coated on the pretreated film for 1 min, and the obtained composite film was treated at 90 °C for 2 h, so that glutaraldehyde and polyethylene glycol were sufficiently cross-linked. The retention of 2000 ppm sodium sulfate of the prepared polyvinyl alcohol nanofiltration membrane is 70.1%, the retention of 2000 ppm of sodium chloride is 58.2%, and the retention of 2000 ppm of polyethylene glycol 600 is 73.2%.

Example Embodiment

Example 2

Prepare a glutaraldehyde aqueous solution with a mass fraction of 2%, add hydrochloric acid solution dropwise to adjust its pH value to about 5, treat the polysulfone bottom membrane with a 2% glutaraldehyde aqueous solution for 2 minutes, dry in the shade, and then add a 2% mass fraction of The polyvinyl alcohol aqueous solution was coated on the pretreated film for 1.5 min, and the obtained composite film was treated at 90 °C for 2 h, so that glutaraldehyde and polyethylene glycol were sufficiently cross-linked. The prepared polyvinyl alcohol nanofiltration membrane had a rejection of 78.7% for 2000 ppm sodium sulfate, 59.5% for 2000 ppm sodium chloride, and 80.1% for 2000 ppm polyethylene glycol 600.

Example Embodiment

Example 3

Prepare an aqueous solution of glutaraldehyde with a mass fraction of 3%, add a sulfuric acid solution dropwise to adjust the pH value to about 5, treat the polysulfone bottom membrane with a 2% aqueous glutaraldehyde solution for 2 minutes, dry in the shade, and then adjust the mass fraction of 3% The polyvinyl alcohol aqueous solution was coated on the pretreated film for 1.5 min, and the obtained composite film was treated at 90 °C for 2 h, so that glutaraldehyde and polyethylene glycol were fully cross-linked. The retention of 2000 ppm sodium sulfate of the prepared polyvinyl alcohol nanofiltration membrane is 83.2%, the retention of 2000 ppm of sodium chloride is 65.3%, and the retention of 2000 ppm of polyethylene glycol 600 is 85.7%.

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PUM

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Abstract

The invention relates to a method for preparing a polyvinyl alcohol nanofiltration membrane with high rejection coefficient by using interface control. The method comprises the following steps: processing a polysulfone base membrane with 2%-8% glutaraldehyde aqueous solution for 2-4 minutes; drying the base membrane in a shade place; coating the polyvinyl alcohol aqueous solution with a mass fraction of 1%-5% onto the preprocessed membrane for 1-3 minutes; and processing the acquired compound membrane for 2-4 hours at 90 DEG C, so as to have full cross-linking reaction between the glutaraldehyde and the polyvinyl alcohol. The prepared polyvinyl alcohol nanofiltration membrane has a rejection coefficient of 98.5% to 2000ppm sodium sulfate, a rejection coefficient of 80.1% to 2000ppm sodium chloride and a rejection coefficient of 98.7% to 2000ppm polyethylene glycol 600. The method provided by the invention is novel and simple and the repeatability of membrane property test is good.

Description

A kind of preparation method of polyvinyl alcohol nanofiltration membrane with high rejection rate technical field The invention relates to a preparation method of a polymer material membrane, in particular to a preparation method of a nanofiltration membrane with good hydrophilicity and high rejection rate. Background technique Nanofiltration is a new type of membrane separation technology. The cut-off range of nanofiltration membrane is between 200-2000, the operating pressure is lower than that of reverse osmosis, and the rejection rate of monovalent ions is much lower than that of divalent ions. And it has a good separation effect on organic pollutants. The composite membrane is a membrane made by first using a polymer to make a porous support membrane, and then using another polymer to form an extremely thin and dense separation layer on the surface of the support membrane. Its preparation methods are divided into four categories including lamination method, dip coa...

Claims

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Application Information

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IPC IPC(8): B01D71/38
Inventor 周勇陈可可翟丁高从堦
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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