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A preparation method of chlorine-resistant aromatic polyamide composite nanofiltration membrane

An aromatic polyamide and composite nanofiltration membrane technology, applied in the field of membrane separation, can solve problems such as membrane separation performance deterioration, and achieve the effects of not easy to run off, improved water permeability and retention rate, and convenient operation.

Active Publication Date: 2021-06-08
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the introduced oxidizing active chlorine will react with the polyamide, causing irreversible damage to the separation layer structure of the polyamide membrane, thereby deteriorating the separation performance of the membrane.

Method used

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  • A preparation method of chlorine-resistant aromatic polyamide composite nanofiltration membrane
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Examples

Experimental program
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Effect test

Embodiment 1

[0025] (1) Monomer solution configuration: m-phenylenediamine was dissolved in water to prepare an aqueous phase solution with a mass concentration of 1%, and trimesoyl chloride was dissolved in n-hexane to prepare an organic phase solution with a mass concentration of 0.01%;

[0026] (2) Interface polymerization: soak the polyvinylidene fluoride ultrafiltration bottom membrane in the aqueous phase solution for 30 minutes, take it out and remove the excess aqueous phase solution on the surface of the membrane with an air knife, and then immerse it in the organic phase solution for 30 seconds to carry out interfacial polymerization After reaction, the membrane was taken out and drained, heat-treated in an oven at 70°C for 5 minutes, then soaked in deionized water for 24 hours to remove unreacted monomers to obtain an aromatic polyamide composite nanofiltration membrane;

[0027] (3) Membrane surface activation: configure the activation solution of 1-(3-dimethylaminopropyl)-3-eth...

Embodiment 2

[0032] (1) Monomer solution configuration: o-phenylenediamine was dissolved in water to prepare an aqueous phase solution with a mass concentration of 15%, and biphenyltetrayl chloride was dissolved in n-hexane to prepare an organic phase solution with a mass concentration of 2%;

[0033] (2) Interface polymerization: soak the polysulfone ultrafiltration bottom membrane in the aqueous phase solution for 30 minutes, take it out and use an air knife to remove excess aqueous phase solution on the membrane surface, then immerse it in the organic phase solution for 30 seconds to carry out interfacial polymerization reaction, Then the membrane was taken out and drained, heat-treated in an oven at 100°C for 3 minutes, then soaked in deionized water for 24 hours to remove unreacted monomers to obtain an aromatic polyamide composite nanofiltration membrane;

[0034] (3) Membrane surface activation: configure the activation solution of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimide hydroc...

Embodiment 3

[0038] (1) Monomer solution configuration: Dissolving syrylenetriamine in water to prepare an aqueous phase solution with a mass concentration of 0.1%, dissolving terephthaloyl chloride in n-hexane to prepare an organic phase solution with a mass concentration of 1%;

[0039](2) Interface polymerization: soak the polyacrylonitrile ultrafiltration bottom membrane in the aqueous phase solution for 30 minutes, take it out and remove the excess aqueous phase solution on the surface of the membrane with an air knife, and then immerse it in the organic phase solution for 30 seconds to carry out interfacial polymerization reaction , and then the membrane was taken out and drained, heat-treated in an oven at 50°C for 7 minutes, then soaked in deionized water for 24 hours to remove unreacted monomers to obtain an aromatic polyamide composite nanofiltration membrane;

[0040] (3) Membrane surface activation: configure the activation solution of 1-(3-dimethylaminopropyl)-3-ethylcarbodiimi...

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Abstract

The invention relates to a preparation method of a chlorine-resistant aromatic polyamide composite nanofiltration membrane, belonging to the technical field of membrane separation. It generates a polyamide layer through interfacial polymerization between polyamines and aromatic acid chlorides; the membrane is immersed in an activation solution, and the unreacted acid chlorides in the polyamide are hydrolyzed into carboxyl groups and then activated into active esters; the polyamines are then used as active esters and oxidized The connecting unit of graphene quantum dots grafts graphene oxide quantum dots onto the surface of polyamide membranes to realize the preparation of chlorine-resistant aromatic polyamide composite nanofiltration membranes. The invention adopts the method of interfacial polymerization first and then quantum dot modification to prepare the chlorine-resistant polyamide composite nanofiltration membrane, the preparation process is simple, the operation is convenient, and the production repeatability is good.

Description

technical field [0001] The invention relates to a preparation method of a chlorine-resistant aromatic polyamide composite nanofiltration membrane, belonging to the technical field of membrane separation. Background technique [0002] Nanofiltration is a pressure-driven membrane separation technology with separation performance between ultrafiltration and reverse osmosis. It has the advantages of small footprint, low overall cost, and relatively high energy efficiency. It has been widely used in wastewater treatment, reclaimed water recycling, etc. Seawater desalination and drinking water purification and other fields. The separation mechanism of nanofiltration membrane is mainly based on nanoscale micropore sieving and charging effect, so the physical and chemical properties and structure of the membrane material have a significant impact on the separation performance. Currently commercially available nanofiltration membranes are mainly polyamide composite nanofiltration me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D61/02B01D69/12B01D67/00
Inventor 彭锦桢张春芳张硕李想仲镜鸿曹万霖王瑞琪
Owner JIANGNAN UNIV
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