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A kind of in-situ doped carbon quantum dot sulfonated polyether ether ketone mixed matrix membrane and its preparation method and application

A technology of sulfonated polyether ether ketone and mixed matrix membrane, which is applied in the direction of chemical instruments and methods, separation methods, membrane technology, etc., can solve the problems of low gas permeability and high crystallinity, achieve cheap and easy raw materials, improve Penetration and dispersibility improvement effects

Active Publication Date: 2020-11-24
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the strong interaction between molecular chains and high crystallinity of the sulfonated polyetheretherketone membrane, the dissolution mechanism of the membrane is restricted by the diffusion mechanism, resulting in generally low gas permeability.

Method used

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  • A kind of in-situ doped carbon quantum dot sulfonated polyether ether ketone mixed matrix membrane and its preparation method and application

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Embodiment 1

[0031] Embodiment 1: The preparation method of the sulfonated polyetheretherketone composite membrane doped with carbon quantum dots in situ according to the present invention, the steps are as follows:

[0032] (1) Take a porous polysulfone filter membrane with a molecular weight cut off of 6000 as a supporting membrane, soak it in 2% ethylenediamine aqueous solution at 30°C for 72 hours, wash and dry it before use.

[0033] (2) Sulfonated PEEK composites doped with carbon quantum dots in situ: PVA and PEEK were dried in a vacuum oven at 80 °C for 24 to remove residual moisture. Add the dried solid mixture of polyether ether ketone and polyvinyl alcohol with a mass ratio of 99.75%:0.25% to the concentrated sulfuric acid solution (the mass ratio of solid mixture to concentrated sulfuric acid is 1:10), at a temperature of 25°C Under the condition of 250rpm, after mechanically stirring for 6h at a rotating speed of 250rpm, the temperature was raised to 60°C for 12h. After the r...

Embodiment 2

[0036] Embodiment 2: The preparation method of the sulfonated polyetheretherketone composite membrane doped with carbon quantum dots in situ according to the present invention, the steps are as follows:

[0037] (1) Take a porous polysulfone filter membrane with a molecular weight cut off of 6000 as a supporting membrane, soak it in 2% ethylenediamine aqueous solution at 30°C for 72 hours, wash and dry it before use.

[0038] (2) Sulfonated polyetheretherketone composites doped with carbon quantum dots in situ: polyvinyl alcohol and polyetheretherketone were dried in a vacuum oven at 80 °C for 24 h to remove residual moisture. Add the dried solid mixture of polyether ether ketone and polyvinyl alcohol with a mass ratio of 99.50%:0.50% to the concentrated sulfuric acid solution (the mass ratio of solid mixture to concentrated sulfuric acid is 1:10), at a temperature of 25°C Under the condition of 250rpm, after mechanically stirring for 6h at a rotating speed of 250rpm, the temp...

Embodiment 3

[0041] Embodiment 3: The preparation method of the sulfonated polyetheretherketone composite membrane doped with carbon quantum dots in situ according to the present invention, the steps are as follows:

[0042] (1) Take a porous polysulfone filter membrane with a molecular weight cut off of 6000 as a supporting membrane, soak it in 2% ethylenediamine aqueous solution at 30°C for 72 hours, wash and dry it before use.

[0043] (2) Sulfonated polyetheretherketone composites doped with carbon quantum dots in situ: polyvinyl alcohol and polyetheretherketone were dried in a vacuum oven at 80 °C for 24 h to remove residual moisture. Add the dried solid mixture of polyether ether ketone and polyvinyl alcohol with a mass ratio of 99.00%:1.00% to the concentrated sulfuric acid solution (the mass ratio of solid mixture to concentrated sulfuric acid is 1:10), at a temperature of 25°C Under the condition of 250rpm, after mechanically stirring for 6h at a rotating speed of 250rpm, the temp...

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Abstract

The invention discloses an SPEEK (Sulfonated Polyether Ether Ketone) mixed matrix membrane with in-situ doped carbon quantum dots as well as a preparation method and application thereof. The preparation method comprises the following steps: taking polyvinyl alcohol and polyether ether ketone as raw materials and adding the raw materials in concentrated sulfuric acid, and reacting, thus obtaining an SPEEK composite material with the in-situ doped carbon quantum dots; dissolving the SPEEK composite material into deionized water, thus preparing a membrane casting solution; preparing a functionallayer on the surface of a microporous filter membrane through a coating method, and forming the SPEEK mixed matrix membrane of the in-situ doped carbon quantum dots, the mixed matrix membrane is formed by SPEEK and carbon quantum dots, wherein the carbon quantum dots account for 0.1 to 5.0 percent by mass of the SPEEK.. The preparation method provided by the invention is simple and easy, a prepared functional membrane can be applied to CO2 / N2 gas separation, and higher CO2 permeability and separation factors are obtained.

Description

technical field [0001] The invention relates to a sulfonated polyether ether ketone mixed matrix membrane doped with carbon quantum dots in situ and its preparation method and application, belonging to the technical field of chemical engineering membrane separation. Background technique [0002] Sulfonated polyetheretherketone contains sulfonic acid groups on the molecular chain to CO 2 Has a strong affinity and is often used to prepare CO 2 separation membrane. Moreover, the preparation process of the sulfonated polyether ether ketone is simple and low in cost, so it has good industrial application prospects. However, due to the strong interaction between molecular chains and high crystallinity of the sulfonated polyetheretherketone membrane, the dissolution mechanism of the membrane is restricted by the diffusion mechanism, resulting in generally low gas permeability. Fine regulation of CO in sulfonated polyetheretherketone groups 2 The structure of the separation memb...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D71/52B01D67/00B01D53/22
CPCB01D53/228B01D67/0079B01D71/52B01D2256/22
Inventor 王永洪张新儒侯蒙杰刘成岑
Owner TAIYUAN UNIV OF TECH