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A method for improving anti-fouling modification of homoporous membranes by using covalent bond layer-by-layer self-assembly

A technology of layer-by-layer self-assembly and covalent bonding, applied in chemical instruments and methods, membrane technology, semi-permeable membrane separation, etc. The effect of gentle process

Active Publication Date: 2022-05-10
吾净科技(深圳)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the difficulty in constructing starting layers that can be used to initiate layer-by-layer covalent self-assembly is a key obstacle hindering the application of this technology in surface modification.

Method used

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  • A method for improving anti-fouling modification of homoporous membranes by using covalent bond layer-by-layer self-assembly
  • A method for improving anti-fouling modification of homoporous membranes by using covalent bond layer-by-layer self-assembly
  • A method for improving anti-fouling modification of homoporous membranes by using covalent bond layer-by-layer self-assembly

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Effect test

Embodiment 1

[0039] A method for improving the anti-pollution modification of homoporous membranes by using covalent bond layer-by-layer self-assembly, specifically comprising the following steps:

[0040] 1. Adsorption and reduction of metal ions on the surface of the homoporous membrane: immerse a symmetrical homoporous membrane based on polystyrene-block-polyacrylic acid (PS-b-PAA) copolymer with a thickness of 15nm in 0.1mg / L silver nitrate aqueous solution , The membrane was removed after 2h. Immerse the above in 25mg / L sodium borohydride aqueous solution, and take out the membrane after 0.5h;

[0041] 2. Immerse the homoporous membrane covered with simple silver in an aqueous solution of polymethacrylate phosphorylcholine with a molecular weight of 10,000 g / mol containing mercapto groups and stir or shake the solution for 0.5 hours. Wherein: the molar ratio of the mercapto functional group is 0.5%, the concentration of polyphosphorylcholine is 1 mg / ml, and the unadsorbed or weakly a...

Embodiment 2

[0046] A method for improving the anti-pollution modification of homoporous membranes by using covalent bond layer-by-layer self-assembly, specifically comprising the following steps:

[0047] 1. Attachment and reduction of metal ions on the surface of the homoporous membrane: Immerse an asymmetric homoporous membrane based on polystyrene-block-poly(4-vinylpyridine) (PS-b-P4VP) with a thickness of 30um into 0.5mg / L Chloroauric acid aqueous solution, the film was taken out after 2h. Then immerse the membrane in 200mg / L ammonia solution, and take it out after 1.5h;

[0048] 2. Immerse the homoporous membrane covered with gold simple substance in the aqueous solution of polystyryl carboxybetaine with molecular weight of 10000g / mol and stir or shake for 0.5h, wherein: the molar ratio of mercapto functional group is 4.5%, and the concentration of carboxybetaine is 5mg / ml, wash with water to elute unadsorbed or weakly adsorbed carboxybetaine polymer;

[0049] 3. The homoporous me...

Embodiment 3

[0053] A method for improving the anti-pollution modification of homoporous membranes by using covalent bond layer-by-layer self-assembly, specifically comprising the following steps:

[0054] 1. Attachment and reduction of metal ions on the surface of the homoporous membrane: Immerse an asymmetric homoporous membrane with a thickness of 35um and based on polystyrene-block-poly(2-vinylpyridine) (PS-b-P2VP) copolymer into 3.5mg / L of zirconium chloride aqueous solution, the film was taken out after 2h. Then immerse the membrane in 1 mg / L aqueous solution of thioglycolic acid, and take out the membrane after 1 hour;

[0055] 2. Immerse the isoporous membrane covered with zirconium simple substance in an aqueous solution of polyacrylic acid phosphorylcholine with a molecular weight of 13000 g / mol and soak for 12 hours with shaking. Wherein: the molar ratio of the mercapto functional group is 11.5%, the concentration of polyacrylic acid phosphorylcholine is 3 mg / ml, and the unads...

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Abstract

The invention discloses a method for improving the anti-pollution modification of a homoporous membrane by using covalent bond layer-by-layer self-assembly. The method comprises the following key steps: 1) using the inherent polar groups on the homoporous membrane to absorb metal ions, and reducing the metal ions to metal simple substances by electroless deposition; 2) using catechol-containing structures and mercapto-containing structures to Adhesion of zwitterionic polymers to metals and mutual Michael addition reactions initiate covalently bonded layer-by-layer self-assembly from ultrathin metal layers. The technical advantages of this method are: all steps are carried out in water, the reaction process is mild, no organic solvent is used, and there is no pollution; the thickness of the metal coating and the gel coating can be adjusted separately, and the precise regulation of the pore size of the homoporous membrane can be realized; The gel coating formed by the covalent bond connection between the zwitterionic polymers has a stable structure and can meet the application requirements in heavily polluted fields.

Description

technical field [0001] The invention belongs to the field of surface functionalization and modification, and in particular relates to a method for improving anti-pollution modification of homoporous membranes by using covalent bond layer-by-layer self-assembly. Background technique [0002] With high porosity, pore density and uniform pore structure, block copolymer homoporous membranes have great potential in the field of ultrafast and precise separation, especially in the extraction of high value-added products such as protein, natural product and drug separation. application potential. Due to the fast filtration rate and (surface) straight-through pore structure, homoporous membranes are easily blocked during use, which causes serious membrane fouling. This feature fundamentally hinders the high-efficiency separation performance of homoporous membranes in the above-mentioned applications. According to different preparation methods, block copolymer homoporous membranes a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/80B01D69/02C08J9/40C08J9/42C08L53/00C08L53/02
CPCB01D71/80B01D69/02C08J9/40C08J9/42C08J2353/00C08J2353/02C08J2433/14C08J2425/18C08J2433/24
Inventor 易砖杨草英吴骏
Owner 吾净科技(深圳)有限公司