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
CN112973460AActive Publication Date: 2021-06-18CHINA UNIV OF PETROLEUM (BEIJING) +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
CHINA UNIV OF PETROLEUM (BEIJING)
Publication Date
2021-06-18

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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.
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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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