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Preparing method of chlorine-resistance 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 improving anti-pollution performance, convenient operation and simple preparation process

Active Publication Date: 2019-05-31
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Preparing method of chlorine-resistance aromatic polyamide composite nanofiltration membrane
  • Preparing method of chlorine-resistance aromatic polyamide composite nanofiltration membrane

Examples

Experimental program
Comparison scheme
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 preparing method of a chlorine-resistance aromatic polyamide composite nanofiltration membrane, and belongs to the technical field of membrane separation. According to the preparing method, through interficial polymerization between polyamine and aromatic acyl chloride, a polyamide layer is generated; a membrane is immersed in an activation solution, the unreacted acyl chloride in polyamide is hydrolyzed to carboxyl, and then the carboxyl is activated to active ester; the polyamine serves as a connecting unit of the active ester and oxidized graphene quantum dots, the oxidized graphene quantum dots are grafted on the surface of a polyamide membrane, and preparation of the chlorine-resistance aromatic polyamide composite nanofiltration membrane is achieved. According to the preparing method, the chlorine-resistance aromatic polyamide composite nanofiltration membrane is prepared by adopting interficial polymerization first, and then conducting quantum dot modification afterwards; the preparing technology is simple, the operation is convenient, and the production repeatability is high.

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 Applications(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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