A kind of preparation method of modified cation exchange membrane

A cation exchange membrane and modification technology, which is applied in the field of preparation of modified cation exchange membranes, can solve the problems of limited application, low selectivity of environmental effects, etc., and achieve the effects of simple preparation process, good selection and separation performance, and easy operation
CN110813386BActive Publication Date: 2022-04-19ZHEJIANG UNIV OF TECH +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV OF TECH
Publication Date
2022-04-19

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Abstract

A preparation method of a modified cation exchange membrane, the preparation method adopts the AC membrane assembly device shown in Figure 1, and the preparation method comprises the following steps: (1) pretreatment; (2) using the AC electric field membrane surface assembly technology, A positively charged monomer layer formed by the reaction of polydopamine and TC was constructed on the surface of the pretreated cation exchange membrane, and (3) a PSSMA band was constructed on the surface of the positively charged monomer layer using alternating current electric field membrane surface assembly technology. Negatively charged polymer layer; (4) according to the required number of layers, continue to alternately construct the membrane surface according to steps (2) and (3), and finally obtain a modified layer on the surface of the cation exchange membrane; (5) combine the steps ( 4) The prepared modified cation exchange membrane is fully soaked in the mixed solution of EDC-HCl and NHS, and washed with water to obtain the modified cation exchange membrane. The modified cation exchange membrane prepared by the invention has good selective separation performance for lithium ions, divalent magnesium ions and calcium ions.
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Description

technical field

[0001] The invention relates to a preparation method of a modified cation exchange membrane used for extracting lithium ions.

[0002] technical background

[0003] Energy shortage and environmental pollution are the most pressing challenges facing our modern civilization, and extracting clean resources from the environment for energy utilization is an economical and eco-friendly approach that can replace traditional non-renewable and environmentally costly fossil fuels. Lithium, as an energy material used in rechargeable lithium batteries and powering most of today's electronics, has been recognized as one of the most promising and efficient resources. Currently, the main source of lithium compounds is limited rock reserves, but producing lithium from these rocks may raise environmental concerns. On the other hand, the richness of salt lakes as lithium resources (accounting for about 62% of the total lithium resources in the world) has aroused people's atten...

Claims

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