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Nanofiltration membrane with brush-shaped zwitterionic polymer modified layer and preparation method thereof

A technology of zwitterions and polymers, which is applied in the field of nanofiltration membranes, can solve the problems of decreased ion retention performance and functional layer damage of nanofiltration membranes, and achieves good application prospects.

Inactive Publication Date: 2019-05-10
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of directly introducing a brush-like zwitterionic structure in the functional layer may lead to the destruction of the functional layer and the decrease of the ion retention performance of the nanofiltration membrane.

Method used

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  • Nanofiltration membrane with brush-shaped zwitterionic polymer modified layer and preparation method thereof
  • Nanofiltration membrane with brush-shaped zwitterionic polymer modified layer and preparation method thereof
  • Nanofiltration membrane with brush-shaped zwitterionic polymer modified layer and preparation method thereof

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preparation example Construction

[0022] The preparation environment of all initial nanofiltration membranes in the present invention is: temperature is 25°C, humidity is 40%, and normal pressure.

[0023] A high-flux, high-retention brush-like zwitterionic nanofiltration membrane is characterized in that it is a high-flux, high-retention brush composed of a polysulfone ultrafiltration membrane as a support layer and an amphoteric polyimide layer as a functional layer. zwitterionic nanofiltration membrane. The steps of its preparation method are as follows:

[0024] (1) Soaking the polysulfone ultrafiltration membrane supporting membrane and the water phase monomer to form a water phase liquid layer; wherein the water phase monomer is piperazine.

[0025] (2) The described aqueous phase liquid layer is contacted with the organic phase solution containing active monomer, forms polyimide layer on the surface of polysulfone ultrafiltration support layer by interfacial polymerization, obtains initial nanofiltrati...

Embodiment 1

[0029] Specific steps are as follows:

[0030] (1) Immerse 0.2wt% piperazine aqueous solution with pH=10 on the polysulfone ultrafiltration membrane support layer, after immersion for 4min, pour off the aqueous solution, and dry the membrane to form an aqueous phase liquid layer on its surface;

[0031] (2) The aqueous phase liquid layer and 0.1wt% trimesoyl chloride-n-hexane solution are polymerized through the interface of 1min, and a polyimide layer is formed on the surface of the polysulfone ultrafiltration membrane support layer to obtain the initial nanofiltration membrane .

Embodiment 2

[0033] Specific steps are as follows:

[0034] (1) Immerse 0.2wt% piperazine aqueous solution with pH=10 on the polysulfone ultrafiltration membrane support layer, after immersion for 4min, pour off the aqueous solution, and dry the membrane to form an aqueous phase liquid layer on its surface;

[0035] (2) The aqueous phase liquid layer and 0.1wt% trimesoyl chloride-n-hexane solution are polymerized through the interface of 1min, and a polyimide layer is formed on the surface of the polysulfone ultrafiltration membrane support layer to obtain the initial nanofiltration membrane ;

[0036] (3) With the described initial nanofiltration membrane, dimethylaminoethyl methacrylate and a concentration of 4 × 10 -4 g / mL of azobisisobutyronitrile ethanol solution at 40°C for 4 hours to obtain a nanofiltration membrane (modified nanofiltration membrane: NF-PDMA) containing tertiary amine groups, and deionized water After cleaning, the ethanol solution of 1,3-propane sultone with a co...

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Abstract

The invention discloses a nanofiltration membrane with a brush-shaped zwitterionic polymer modified layer and a preparation method thereof. The preparation method of the nanofiltration membrane with the brush-shaped zwitterionic polymer modified layer comprises the following steps: soaking a polysulfone ultrafiltration membrane support membrane in a piperazine solution to form an aqueous phase liquid layer; contacting the aqueous phase liquid layer with an organic solution containing trimesoyl chloride, and forming a polyimide layer on the surface of a polysulfone ultrafiltration support layerby virtue of interface polymerization reaction to obtain an initial nanofiltration membrane; soaking a polysulfone ultrafiltration membrane of the polyimide layer in a solution containing a tertiaryamine monomer and an azo initiator, and grafting and modifying the surface to obtain a tertiary amine-based nanofiltration membrane containing tertiary amine groups; and cleaning with deionized water,quaternizing with a solution containing sultone or alkyl sulfonate monomers, and cleaning to obtain the nanofiltration membrane with the brush-shaped zwitterionic polymer modified layer. The novel brush-shaped zwitterion nanofiltration membrane with high flux and high interception prepared by the invention is suitable for the fields of water softening, wastewater treatment and the like, and has good application prospect.

Description

technical field [0001] The invention relates to the technical field of nanofiltration membranes, in particular to a nanofiltration membrane with a brush-like zwitterionic polymer modification layer with high flux and high retention and a preparation method thereof. Background technique [0002] In recent years, the development of membrane separation technology is getting better and better. Due to its advantages of energy saving, environmental protection and high efficiency, it has risen from the ground and developed rapidly in terms of separation and purification. Nanofiltration is a new pressure-driven separation process between reverse osmosis and ultrafiltration. Nanofiltration membrane is a charged separation membrane, which effectively separates inorganic salts of different valence states through the dual effects of pore size sieving and electrostatic repulsion. It rejects less than 50% of monovalent salts but more than 90% of polyvalent salts. Nanofiltration has the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D71/78B01D69/02B01D67/00B01D61/02
Inventor 薛立新董丰恺孙志娟高从堦
Owner ZHEJIANG UNIV OF TECH
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