A covalent organic framework mixed matrix membrane, its in-situ growth method and application in ion separation

Abstract

The application provides a kind of covalent organic framework mixed matrix membrane and its in-situ growth method and application in ion separation, comprising: respectively dissolving cellulose derivative, aldehyde monomer of covalent organic framework, amine monomer of covalent organic framework in organic solvent, to obtain first solution, second solution and third solution;Acetic acid solution and first solution, second solution, third solution are mixed to obtain homogeneous casting solution;Drop coating is carried out, and in-situ growth is obtained.The application constructs CD@COF mixed matrix membrane based on cellulose derivative matrix and low load covalent organic framework filler by in-situ growth method;The interface compatibility between the prepared mixed matrix membrane matrix and filler is good.The above-mentioned mixed matrix membrane preparation process is simple, has good mechanical strength and high expandability, has high ion flux and excellent ion selectivity for monovalent and divalent ion separation, and has wide application prospect in wastewater resource treatment, salt lake lithium extraction and energy storage and other fields.

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