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Nanofiber-polydopamine composite membrane as well as preparation method and application thereof

A nanofiber membrane and nanofiber technology, applied in the field of nanofiltration membranes, can solve the problems of chemical stability, weather resistance and thermal stability that cannot meet application requirements, limitations, and inability to achieve accurate screening of substances, so as to improve the retention performance. , The method is simple, and the effect of improving the hydrophilicity

Inactive Publication Date: 2021-12-07
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The separation selectivity of nanofiltration membranes depends on their pore size distribution. The nanofiltration membranes prepared by traditional methods have a wide pore size distribution and cannot achieve precise screening of substances.
Moreover, traditional organic nanofiltration membrane materials are limited by their chemical structure, and their chemical stability, weather resistance, and thermal stability usually cannot meet relatively demanding application requirements.

Method used

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  • Nanofiber-polydopamine composite membrane as well as preparation method and application thereof
  • Nanofiber-polydopamine composite membrane as well as preparation method and application thereof
  • Nanofiber-polydopamine composite membrane as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Nano fiber - polydopamine composite film preparation method comprising the steps of:

[0051] 1) 1g and 2g of the aramid fibers dispersed in 100mL of KOH in dimethyl sulfoxide, stirred for 7 days at room temperature, stirring speed 600rpm, to obtain a nanofiber sol (length of nanofibers is 50μm ~ 100μm, diameter of 5nm ~ 20nm);

[0052] 2) The nanofiber sol after pumping to remove bubbles in vacuo doctor blading 200nm pore size of the organic nylon membrane, a blade height of 500μm, 60 ℃ dried in vacuo 12h, then peeled off from the porous base membrane with deionized water soaking the film surface to remove impurities to give nanofiber membrane;

[0053] 3) The dispersion of dopamine hydrochloride 4g 100mL of N, N- dimethyl formamide, magnetic stirring in a nitrogen atmosphere, stirring speed of 500r / min, stirring time of 8h, then with 50mL concentration of 50mmol / L, pH = 8.5 Tris-HCl buffer solution is mixed to obtain a mixed solution dopamine;

[0054] 4) The nanofibe...

Embodiment 2

[0065] Nano fiber - polydopamine composite film preparation method comprising the steps of:

[0066] 1) A 3g and 2g of aramid fibers dispersed in 150mL of KOH in dimethyl sulfoxide, stirred for 5 days at room temperature, stirring speed of 500 rpm for, to obtain a nanofiber sol (length of nanofibers is 10μm ~ 200μm, 10nm diameter ~ 20nm);

[0067] 2) The nanofiber sol after pumping to remove bubbles in vacuo doctor blading 200nm pore size of the organic nylon membrane, a blade height of 300μm, 60 ℃ dried in vacuo 12h, then peeled off from the porous base membrane with deionized water soaking the film surface to remove impurities to give nanofiber membrane;

[0068] 3) The dispersion of dopamine hydrochloride 2g 100mL of N, N- dimethyl formamide, magnetic stirring in a nitrogen atmosphere, stirring speed of 300r / min, the stirring time was 5h, and then 30mL concentration of 50mmol / L, pH = 8.5 Tris-HCl buffer solution is mixed to obtain a mixed solution dopamine;

[0069] 4) The ...

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Abstract

The invention discloses a nanofiber-polydopamine composite membrane as well as a preparation method and application thereof. The nanofiber-polydopamine composite membrane comprises a nanofiber membrane and polydopamine, the nanofiber membrane is formed by interweaving nanofibers, and the polydopamine is attached to the surfaces of the nanofibers. The preparation method of the nanofiber-polydopamine composite membrane comprises the following steps: 1) preparing nanofiber sol; 2) preparing a nanofiber membrane; 3) preparing a dopamine mixed solution; and 4) immersing the nanofiber membrane into the dopamine mixed solution, dipping, taking out, washing with water, and drying to obtain the nanofiber-polydopamine composite membrane. The nanofiber-polydopamine composite membrane has the advantages of good permeability, good interception performance, good hydrophilicity, high structural stability and the like, and the preparation method is simple, high in applicability and suitable for large-scale industrial production.

Description

Technical field [0001] The present invention relates to a nanofiltration membrane technologies, and particularly relates to a nanofiber - Polydopamine composite membrane and a preparation method and application. Background technique [0002] With the development of the world population increases and industrial pollution a growing problem on Earth can take advantage of the declining amount of fresh water, water shortage has become one of the key issues of global concern. Nanofiltration is a pressure between reverse osmosis and ultrafiltration driven separation process, having a low operating pressure, low cost, selectivity, etc., it is widely used in water softening, water treatment and other fields, and nanofiltration nanofiltration membrane is the key technology. [0003] Nanofiltration is a pressure driven membrane, nanofiltration membrane solute transport will in effect be controlled Road South, spatial effect, migration effect and dielectric effects, the membrane pore size is...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D71/48B01D71/26B01D71/10B01D69/12B01D69/02B01D67/00B01D61/02
CPCB01D71/48B01D71/10B01D71/26B01D71/68B01D69/12B01D61/027B01D69/02B01D67/0002B01D2325/36
Inventor 肖丹丁力赵子颢
Owner SOUTH CHINA UNIV OF TECH
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