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Micromolecular zwitterion modified surface polyamide composite membrane and preparation method thereof

A technology of surface polyamide and zwitterions, which is applied in semi-permeable membrane separation, chemical instruments and methods, membranes, etc., can solve the problems of membrane pollution, increased operating costs, permeate flux and quality reduction required by industrialization, and achieve faster Effects of mass transfer, improved hydrophilicity, and high rejection

Active Publication Date: 2020-08-21
TIANJIN POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although polyamide membranes have many advantages, there are still problems to be solved, such as the permeate flux cannot meet the needs of industrialization and serious membrane fouling problems. With the occurrence of membrane fouling, the flux and quality of permeate continue to decrease, and finally increase the operation cost

Method used

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  • Micromolecular zwitterion modified surface polyamide composite membrane and preparation method thereof
  • Micromolecular zwitterion modified surface polyamide composite membrane and preparation method thereof
  • Micromolecular zwitterion modified surface polyamide composite membrane and preparation method thereof

Examples

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Embodiment 1

[0056] A small molecule zwitterion modified surface polyamide composite membrane, the polyamide composite membrane includes an ultrafiltration bottom membrane and a polyamide layer modified by small molecules, and the polyamide layer covers the surface of the ultrafiltration bottom membrane;

[0057] The small molecule is 3-((2-((4-aminophenyl)amino)-ethyl)dimethyl)propane-1-sulfonate.

[0058] The preparation method of the described small molecule zwitterion modified surface polyamide composite membrane comprises the following steps:

[0059] (1) Immerse the polysulfone ultrafiltration membrane in the mixed aqueous solution containing 2.4wt% camphorsulfonic acid, 1.1wt% triethylamine and 2.0wt% m-phenylenediamine for 2min, then take out and remove the water on the surface phase solution;

[0060] (2) Immerse the polysulfone ultrafiltration membrane treated in the step (1) in the n-hexane solution containing 0.1wt% trimesoyl chloride for 1min, then take out and remove the org...

Embodiment 2

[0063] A small molecule zwitterion modified surface polyamide composite membrane, the polyamide composite membrane includes an ultrafiltration bottom membrane and a polyamide layer modified by small molecules, and the polyamide layer covers the surface of the ultrafiltration bottom membrane;

[0064] The small molecule is 3-((2-((4-aminophenyl)amino)-ethyl)dimethyl)propane-1-sulfonate.

[0065] The preparation method of the described small molecule zwitterion modified surface polyamide composite membrane comprises the following steps:

[0066] (1) Immerse the polysulfone ultrafiltration membrane in the mixed aqueous solution containing 2.4wt% camphorsulfonic acid, 1.1wt% triethylamine and 2.0wt% m-phenylenediamine for 2min, then take out and remove the water on the surface phase solution;

[0067] (2) Immerse the polysulfone ultrafiltration membrane treated in the step (1) in the n-hexane solution containing 0.1wt% trimesoyl chloride for 1min, then take out and remove the org...

Embodiment 3

[0070] A small molecule zwitterion modified surface polyamide composite membrane, the polyamide composite membrane includes an ultrafiltration bottom membrane and a polyamide layer modified by small molecules, and the polyamide layer covers the surface of the ultrafiltration bottom membrane;

[0071] The small molecule is 3-((2-((4-aminophenyl)amino)-ethyl)dimethyl)propane-1-sulfonate.

[0072] The preparation method of the described small molecule zwitterion modified surface polyamide composite membrane comprises the following steps:

[0073] (1) Immerse the polysulfone ultrafiltration membrane in the mixed aqueous solution containing 2.4wt% camphorsulfonic acid, 1.1wt% triethylamine and 2.0wt% m-phenylenediamine for 2min, then take out and remove the water on the surface phase solution;

[0074] (2) Immerse the polysulfone ultrafiltration membrane treated in the step (1) in the n-hexane solution containing 0.1wt% trimesoyl chloride for 1min, then take out and remove the org...

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Abstract

The invention provides a micromolecular zwitterion modified surface polyamide composite membrane which comprises an ultrafiltration bottom membrane and a micromolecular modified polyamide layer, and the polyamide layer covers the surface of the ultrafiltration bottom membrane. The functional groups of the small molecules comprise at least one of amino or hydroxyl. According to the micromolecular zwitterion modified surface polyamide composite membrane, an easily available functional micromolecular monomer with an amino or hydroxyl functional group is grafted to the surface of a polyamide composite membrane through a surface secondary interface polymerization method to obtain a zwitterion surface, the hydrophilicity of the surface of the membrane is improved, the mass transfer of water molecules is accelerated and the aims of high flux and pollution resistance are realized by utilizing extremely strong acting force between zwitterions and the water molecules, and the water flux of the modified membrane can be improved by 30-60% compared with that of an unmodified polyamide membrane on the premise of keeping high rejection rate.

Description

technical field [0001] The invention belongs to the field of separation membrane preparation, and in particular relates to a small molecule zwitterion-modified surface polyamide composite membrane and a preparation method thereof. Background technique [0002] In recent years, membrane separation technology has emerged as a promising water treatment technology due to its energy efficiency, environmental protection, and ease of commercialization. Membrane materials currently used mainly include cellulose acetate, aromatic polyamide, and yellowed polysulfone. Among them, the polyamide composite membrane is prepared by interfacial polymerization reaction of polyamine and polyacyl chloride on the support membrane. It has excellent water permeability and selective separation, and is widely used in the production and application fields of reverse osmosis, nanofiltration membrane and forward osmosis membrane in the world. occupy a dominant position. [0003] Although polyamide me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D69/12B01D71/56B01D67/00C02F1/44
CPCB01D69/12B01D71/56B01D67/0006C02F1/44B01D2325/36
Inventor 李少路胡云霞单鑫尧
Owner TIANJIN POLYTECHNIC UNIV
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