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Cross-linked covalent organic framework desalination membrane as well as preparation method and application thereof

A covalent organic framework and cross-linking technology, which is applied in the field of separation membranes, can solve the problems of complex COF mixed matrix membrane methods, large covalent organic framework pore size, and easy defects in the formed membrane, so as to achieve the elimination of defects, small thickness, The effect of simple reaction system components

Active Publication Date: 2021-06-18
CHINA UNIV OF PETROLEUM (BEIJING) +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is difficult to completely avoid the aggregation of COFs nanoparticles during the film preparation process, and the preparation process is complicated, which makes the film prone to defects.
[0004] Therefore, it is necessary to provide a covalent organic framework desalination membrane that can effectively solve the problems of large pore size of the covalent organic framework, low desalination efficiency caused by defects in the formed membrane, and the complexity of the COF mixed matrix membrane method and the tendency to agglomerate.

Method used

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  • Cross-linked covalent organic framework desalination membrane as well as preparation method and application thereof
  • Cross-linked covalent organic framework desalination membrane as well as preparation method and application thereof
  • Cross-linked covalent organic framework desalination membrane as well as preparation method and application thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0059] This example provides a cross-linked covalent organic framework desalination membrane, figure 1 It is a schematic flow chart of the preparation method of the desalination membrane. Such as figure 1 Shown, preparation method comprises the following steps:

[0060] 1. Mix PSF (weight average molecular weight 35,000Da), PVP, and NMP according to the mass ratio of 15:8:77, and stir magnetically for 24 hours until the solution is uniform and clear, and the casting solution is obtained. Leave the casting solution to defoam for more than 24 hours, adjust the air humidity to 75-77RH%, quickly pour the casting solution on one end of a clean and dry glass plate, scrape the film with a scraper knife with a thickness of 140 μm, and let it stay for 30 seconds. Put into a water bath and heat at 60°C for 30min, rinse with deionized water to obtain a polysulfone porous base membrane (i.e. figure 1 PSf matrix in ) and placed in deionized water for later use.

[0061] 2. Pour 15mL of...

Embodiment 2

[0064] This example provides a cross-linked covalent organic framework desalination membrane, the preparation method of which is basically the same as that of Example 1, the only difference being the residence time of the TMC solution in step 3 on the surface of the COFs layer (which can be regarded as the cross-linking reaction time, The same below) is 5s.

Embodiment 3

[0066] This example provides a cross-linked covalent organic framework desalination membrane, the preparation method of which is basically the same as that of Example 1, except that the cross-linking reaction time in step 3 is 10s.

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Abstract

The invention provides a cross-linked covalent organic framework desalination membrane as well as a preparation method and application thereof. The preparation method comprises the following steps: coating the surface of a base membrane having a COFs layer with an acyl chloride compound solution, carrying out a cross-linking reaction, and curing to obtain the cross-linked covalent organic framework desalination membrane. The invention also provides the cross-linked covalent organic framework desalination membrane prepared by the method. The invention further provides application of the cross-linked covalent organic framework desalination membrane in nanofiltration membranes and reverse osmosis membranes. According to the preparation method provided by the invention, the acyl chloride compound is used for carrying out in-situ crosslinking on the covalent organic framework layer, so that the rejection rate of the covalent organic framework desalination membrane on inorganic salt can be greatly improved, and the preparation method has important reference value for preparing a separable desalination membrane.

Description

technical field [0001] The invention relates to the field of separation membranes, in particular to a cross-linked covalent organic framework desalination membrane and its preparation method and application. Background technique [0002] Compared with traditional nanomaterials, covalent organic frameworks (COFs) have high porosity, high surface area, uniform pore size, and clear pore structure. The porous structure of COFs provides selectively permeable water channels, facilitating water transport. Therefore, increasing attention has been paid to constructing advanced separation membranes. [0003] However, due to the large pore size and poor desalination effect of COFs materials, most of the existing researches focus on the interception of dye molecules or organics. In addition, to date, most studies on membranes incorporating COFs have been devoted to the preparation of ultrafiltration and porous nanofiltration membranes, and recently, some interfacial synthesis at the w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D67/00B01D69/12B01D61/02
CPCB01D67/0088B01D69/125B01D61/025B01D61/027Y02A20/131
Inventor 孔繁鑫岳黎平杨智云孙广东
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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