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Preparation method of molecular sieve modified polysulfone ultrafiltration membrane

A polysulfone ultrafiltration membrane and molecular sieve technology, which is applied in the field of membrane separation to achieve the effects of increasing mechanical properties, improving water flux, improving water flux and interception

Active Publication Date: 2012-06-27
NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Through the above analysis, it can be found that by adding molecular sieves to the casting solution, the water flux and retention of the membrane can be improved by means of the nano-microporous channels of the molecular sieve itself, thereby preparing a polysulfone membrane with improved water flux and retention. to report

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Step (1). Add 50g of polyethylene glycol, 730g of dimethylformamide, 200g of polysulfone and 20g of molecular sieve into the container in order and stir for 24 hours at 30°C, stirring and dissolving to obtain a preliminarily uniformly dispersed casting solution; wherein the molecular sieve It is a type A molecular sieve with an average particle size of 10 nanometers and an average micropore channel diameter of 0.3 nanometers;

[0023] Step (2). Place the preliminarily uniformly dispersed casting solution at 30° C. for 36 hours for defoaming;

[0024] Step (3). Acting the defoamed casting solution in an ultrasonic field with a frequency of 100 kHz and a temperature of 50° C. for 1 hour to obtain a casting solution in which molecular sieves are uniformly dispersed;

[0025] Step (4). The film casting solution in which the molecular sieves are uniformly dispersed is prepared into a microporous film by a phase inversion method;

[0026] Step (5). Soak the microporous membr...

Embodiment 2

[0034] Step (1). Add 20g of polyvinylpyrrolidone, 675g of dimethylacetamide, 300g of polysulfone and 5g of molecular sieve into the container in order and stir for 15 hours at 50°C, stir and dissolve to obtain a uniformly dispersed casting solution; wherein the molecular sieve is X-type molecular sieve, with an average particle size of 300 nanometers and an average micropore channel diameter of 0.5 nanometers;

[0035] Step (2). Place the preliminarily uniformly dispersed casting solution at 40° C. for 32 hours for defoaming;

[0036] Step (3). Acting the degassed casting solution in an ultrasonic field with a frequency of 80 kHz and a temperature of 40° C. for 2 hours to obtain a casting solution in which molecular sieves are uniformly dispersed;

[0037] Step (4). The film casting solution in which the molecular sieves are uniformly dispersed is prepared into a microporous film by a phase inversion method;

[0038] Step (5). Soak the microporous membrane in water for 30 hou...

Embodiment 3

[0046] Step (1). Add 10g ethylene glycol, 810g dimethyl sulfoxide, 150g polysulfone and 30g molecular sieve into the container in order and stir for 18 hours at 45°C, stir and dissolve to obtain a uniformly dispersed casting solution; wherein the molecular sieve is Y-type molecular sieve, with an average particle size of 500 nanometers and an average micropore channel diameter of 0.8 nanometers;

[0047] Step (2). Place the preliminarily uniformly dispersed casting solution at 50° C. for 30 hours for defoaming;

[0048] Step (3). Acting the degassed casting solution in an ultrasonic field with a frequency of 60 kHz and a temperature of 60° C. for 3 hours to obtain a casting solution in which molecular sieves are uniformly dispersed;

[0049] Step (4). The film casting solution in which the molecular sieves are uniformly dispersed is prepared into a microporous film by a phase inversion method;

[0050] Step (5). Soak the microporous membrane in water for 25 hours to remove th...

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Abstract

The invention relates to a preparation method of a molecular sieve modified polysulfone ultrafiltration membrane. Existing methods for improving the permeability of polysulfone membranes cannot give consideration to both water flux and interception performance. The method comprises: first adding an organic additive, a solvent, polysulfone and a molecular sieve into a container in order and conducting stirring for dissolving so as to obtain a preliminarily well dispersed membrane casting solution, which is then leaved to stand for 18-36 hours at a temperature of 30-80DEG C for deaeration; subjecting the deaerated membrane casting solution to 1-5h of action in an ultrasonic field, thus obtaining a molecular sieve uniformly dispersed membrane casting solution; and preparing the molecular sieve uniformly dispersed membrane casting solution into a microporous membrane by a phase inversion method, dipping the microporous membrane in water for at least 24h to remove the solvent, thus obtaining the polysulfone ultrafiltration membrane. The polysulfone ultrafiltration membrane prepared by the method of the invention can has simultaneously improved water flux and interception performance.

Description

technical field [0001] The invention relates to the technical field of membrane separation, and relates to a preparation method of molecular sieve modified polysulfone ultrafiltration membrane. Background technique [0002] Ultrafiltration membrane is a pressure-driven membrane with properties between microfiltration and nanofiltration. It can remove pigment, colloid, protein and other harmful substances, so it has been widely used in water treatment, food processing, medicine, textile and other industries. Because polysulfone has high mechanical properties, thermal stability, chemical stability, etc., polysulfone ultrafiltration membranes are often used as support layers for composite membranes such as nanofiltration, forward osmosis, and reverse osmosis. However, since polysulfone is a hydrophobic material, the water flux of the prepared composite membrane is usually relatively low. [0003] Many methods have been used to improve the hydrophilicity of polysulfone membran...

Claims

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Application Information

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IPC IPC(8): B01D71/68
Inventor 刘富马碧荣石虎砚陶咪咪薛立新
Owner NINGBO INST OF MATERIALS TECH & ENG CHINESE ACADEMY OF SCI
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