High-performance polyamide composite separation membrane based on biopolymer fouling base membrane and preparation method thereof

A polyamide and separation membrane technology, applied in the field of membrane separation, to achieve the effects of enhanced water permeability, simple operation and guaranteed retention performance

Active Publication Date: 2022-04-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] Aiming at the problems in the prior art, the present invention provides a high-performance polyamide composite separation membrane based on a biopolymer-contaminated base membrane and a preparation method thereof. The method of the present invention first uses a biopolymer-contaminated base membrane to obtain Contaminated layer composite, and then generate a polyamide interception layer on the surface of the composite through interfacial polymerization. The present invention innovatively utilizes biopolymer contamination as a means of modifying the base membrane, and improves the interfacial polymerization reaction conditions , prepared a high-flux and high-rejection polyamide composite separation membrane based on biopolymer-contaminated base membranes, opened up the green recycling chain between low-pressure membranes and high-pressure membranes, and solved pollution / scrap low-pressure membrane recycling Using puzzles provides effective means

Method used

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  • High-performance polyamide composite separation membrane based on biopolymer fouling base membrane and preparation method thereof
  • High-performance polyamide composite separation membrane based on biopolymer fouling base membrane and preparation method thereof
  • High-performance polyamide composite separation membrane based on biopolymer fouling base membrane and preparation method thereof

Examples

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Effect test

Embodiment 1

[0027] Preparation of High Performance Polyamide Composite Separation Membrane Based on Polysaccharide Contaminated Base Membrane:

[0028] (1) Prepare 80 mL of 10 mg / L sodium alginate aqueous solution, and then vacuum filter it onto a circular polyethersulfone microfiltration membrane (pore size 0.22 μm) with a diameter of 4 cm to obtain a polysaccharide-contaminated basement membrane, that is, the basement membrane The complex of the membrane and the polysaccharide fouling layer (such as figure 1 As shown, the basement membrane surface has been successfully polluted by polysaccharide);

[0029] (2) dissolving piperazine in water to form a first solution with a mass concentration of 0.05%, then place the complex obtained in step (1) in the first solution and soak for 2 minutes, then take it out, and remove excess liquid on the surface of the complex with a rubber roller drop;

[0030] (3) Dissolving trimesoyl chloride in n-hexane to form a second solution with a mass concen...

Embodiment 2

[0032] Preparation of high-performance polyamide composite separation membrane based on protein fouling base membrane:

[0033] (1) Vacuum filter 80 mL of 10 mg / L bovine serum albumin aqueous solution onto a circular polyethersulfone microfiltration membrane (pore size 0.22 μm) with a diameter of 4 cm to obtain a protein-contaminated basement membrane, that is, basement membrane and protein contamination complex of layers (such as figure 1 As shown, the basement membrane surface has been successfully contaminated with protein);

[0034] (2) dissolving piperazine in water to form a first solution with a mass concentration of 0.05%, then place the complex obtained in step (1) in the first solution and soak for 2 minutes, then take it out, and remove excess liquid on the surface of the complex with a rubber roller drop;

[0035] (3) Dissolving trimesoyl chloride in n-hexane to form a second solution with a mass concentration of 0.04%, then immersing the complex after step (2) i...

Embodiment 3

[0037] Preparation of high-performance polyamide composite separation membrane based on humic acid-contaminated base membrane:

[0038] (1) 80mL of 10mg / L humic acid aqueous solution is vacuum filtered onto a circular polyethersulfone microfiltration membrane (aperture 0.22 μm) with a diameter of 4cm to obtain a humic acid-contaminated basement membrane, that is, basement membrane and The complex of humic acid pollution layer (such as figure 1 As shown, the basement membrane surface has been successfully polluted by humic acid);

[0039] (2) dissolving piperazine in water to form a first solution with a mass concentration of 0.05%, then place the complex obtained in step (1) in the first solution and soak for 2 minutes, then take it out, and remove excess liquid on the surface of the complex with a rubber roller drop;

[0040] (3) Dissolving trimesoyl chloride in n-hexane to form a second solution with a mass concentration of 0.04%, then immersing the complex after step (2) ...

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Abstract

The invention discloses a high-performance polyamide composite separation membrane based on a biopolymer polluted base membrane and a preparation method thereof, belonging to the technical field of membrane separation. In this method, the first choice is to use the biopolymer-contaminated basement membrane to obtain a complex of the basement membrane and the biopolymer-contaminated layer; The excess liquid droplets on the surface of the body; then immerse the compound after the previous step treatment in the second solution formed by dissolving the acid chloride monomer in n-hexane to carry out interfacial polymerization to form a trapping layer on the surface of the compound. After the reaction is completed, take it out to dry, and then Heat treatment to obtain the target separation membrane. The present invention innovatively utilizes biological polymer pollution as a means of modifying the base membrane, which plays a positive role in regulating the interfacial polymerization to form a polyamide interception layer, and significantly improves the water passing capacity of the prepared polyamide separation membrane. It provides an effective means to solve the problem of pollution / scrap low-pressure membrane recycling and use.

Description

technical field [0001] The invention relates to a polyamide composite separation membrane and a preparation method thereof, in particular to a high-performance polyamide composite separation membrane based on a biopolymer polluted base membrane and a preparation method thereof, belonging to the technical field of membrane separation. Background technique [0002] Membrane separation technology is widely used in seawater desalination, sewage treatment and reuse, chemical separation, etc., and the global demand for membrane separation technology is still growing. One of the main problems faced by membrane separation technology is membrane fouling. Membrane fouling will lead to a decrease in the water flux of the membrane and an increase in operating energy consumption. Although the flux can be restored to a certain extent after proper cleaning, due to the existence of irreversible or irreversible fouling in the membrane fouling, the membrane module will not be reversible after...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/56B01D69/12B01D67/00
CPCB01D71/56B01D69/12B01D67/0002B01D67/0006B01D69/105B01D71/08B01D69/1251B01D67/0095B01D69/122B01D2321/16
Inventor 王志伟戴若彬韩鸿毅王天霖
Owner TONGJI UNIV
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