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Polyacrylonitrile composite nanofiltration membrane for sewage treatment and preparation method of polyacrylonitrile composite nanofiltration membrane

A composite nanofiltration membrane and polyacrylonitrile-based membrane technology, which is applied in water/sewage treatment, water/sludge/sewage treatment, permeation/dialysis water/sewage treatment, etc., can solve the problem of low water flux of nanofiltration membrane problems, achieve high retention rate, increase water flux, and not easy to fall off

Inactive Publication Date: 2018-05-22
长兴科创科技咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The present invention aims to overcome the problem of low water flux of nanofiltration membranes in the prior art, and provide a composite nanofiltration membrane with high flux and high rejection rate for organic molecules

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A polyacrylonitrile composite nanofiltration membrane for sewage treatment, comprising a hydrophilic polyacrylonitrile base membrane and a composite layer covering the base membrane, the preparation method of the hydrophilic polyacrylonitrile base membrane comprising the following steps:

[0027] (1) Mix 55mL of ethanol and 90mL of deionized water evenly, then add 0.15mol of citric acid and 0.3mol of polyvinyl alcohol and mix evenly to obtain a hydrophilic agent;

[0028] (2) Soak the hydrophobic polyacrylonitrile-based film in the hydrophilic agent for 10 hours to make the polyacrylonitrile-based film transparent and obtain the intermediate film 1;

[0029] (3) Put the interlayer film 1 into an oven for heat treatment for 25 minutes at a temperature of 55°C to obtain the interlayer film 2;

[0030] (4) Soak the interlayer film 2 in deionized water for 2 hours, take it out, and dry it in an oven at a temperature of 60°C for 30 minutes to obtain a hydrophilic polyacrylon...

Embodiment 2

[0038] A polyacrylonitrile composite nanofiltration membrane for sewage treatment, comprising a hydrophilic polyacrylonitrile base membrane and a composite layer covering the base membrane, the preparation method of the hydrophilic polyacrylonitrile base membrane comprising the following steps:

[0039] (1) Mix 56mL of ethanol and 92mL of deionized water evenly, then add 0.16mol of citric acid and 0.35mol of polyvinyl alcohol and mix evenly to obtain a hydrophilic agent;

[0040] (2) Soak the hydrophobic polyacrylonitrile-based film in a hydrophilic agent for 12 hours to make the polyacrylonitrile-based film transparent and obtain the intermediate film 1;

[0041] (3) Put the interlayer film 1 into an oven for heat treatment for 30 minutes at a temperature of 60°C to obtain the interlayer film 2;

[0042] (4) Soak the interlayer film 2 in deionized water for 2.5 hours, take it out, and dry it in an oven at a temperature of 65°C for 32 minutes to obtain a hydrophilic polyacrylo...

Embodiment 3

[0050]A polyacrylonitrile composite nanofiltration membrane for sewage treatment, comprising a hydrophilic polyacrylonitrile base membrane and a composite layer covering the base membrane, the preparation method of the hydrophilic polyacrylonitrile base membrane comprising the following steps:

[0051] (1) Mix 58mL of ethanol and 95mL of deionized water evenly, then add 0.17mol of citric acid and 0.4mol of polyvinyl alcohol and mix evenly to obtain a hydrophilic agent;

[0052] (2) Soak the hydrophobic polyacrylonitrile-based film in a hydrophilic agent for 14 hours to make the polyacrylonitrile-based film transparent and obtain the intermediate film 1;

[0053] (3) Put the interlayer film 1 into an oven for heat treatment for 35 minutes at a temperature of 65°C to obtain the interlayer film 2;

[0054] (4) Soak the interlayer film 2 in deionized water for 3 hours, take it out, and dry it in an oven at a temperature of 68°C for 35 minutes to obtain a hydrophilic polyacrylonitr...

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PUM

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Abstract

The invention relates to the technical field of environmental protection, and discloses a polyacrylonitrile composite nanofiltration membrane for sewage treatment and a preparation method of the polyacrylonitrile composite nanofiltration membrane. The composite nanofiltration membrane comprises a hydrophilic polyacrylonitrile base membrane and a composite layer which covers the base membrane, andthe preparation method of the hydrophilic polyacrylonitrile base membrane comprises the following steps of: (1) mixing ethanol and deionized water uniformly, then adding citric acid and polyvinyl alcohol, and performing stirring and even mixing to obtain a hydrophilic agent; (2) soaking a hydrophobic polyacrylonitrile base membrane into the hydrophilic agent so as to make the soaked polyacrylonitrile base membrane transparent and obtain an intermediate membrane 1; (3) putting the intermediate membrane 1 in an oven for heat treatment to obtain an intermediate membrane 2; and (4) putting the intermediate membrane 2 in deionized water for soaking, taking out the soaked intermediate membrane 2, and putting the soaked intermediate membrane 2 in the oven for drying to obtain the hydrophilic polyacrylonitrile base film. The composite nanofiltration membrane has a high retention rate and high water flux at the same time.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a polyacrylonitrile composite nanofiltration membrane used for sewage treatment and a preparation method thereof. Background technique [0002] The pore size or separation precision of the nanofiltration membrane is between ultrafiltration and reverse osmosis, the interception of molecules is between 200~1000Da, and the pore size of the membrane is about 1 nanometer, which can be used to separate small molecular organic substances and ions , and has the characteristics of low operating pressure and low energy consumption. At present, nanofiltration membranes have been widely used in sewage treatment, water softening, and separation and purification processes in food, dye and other industries. The preparation techniques of nanofiltration membranes include phase inversion method, blending method, composite method, thermally induced phase inversion method, chemical...

Claims

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Application Information

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IPC IPC(8): B01D71/42B01D69/12B01D69/02B01D67/00B01D61/02C02F1/44
CPCB01D71/42B01D61/027B01D67/0002B01D69/02B01D69/12B01D2323/30B01D2323/46B01D2325/36C02F1/442
Inventor 赵志云
Owner 长兴科创科技咨询有限公司