A monovalent selective cation exchange membrane coupled with dibenzo-18-crown-6 nanomaterials and a preparation method thereof

CN117919964BActive Publication Date: 2026-07-07ZHEJIANG UNIV OF TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV OF TECH
Filing Date
2024-01-24
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing electrodialysis technologies lack high-performance, highly selective ion exchange membranes, making it difficult to achieve effective separation of specific ions, especially in areas such as lithium extraction from salt lakes, crude salt refining, and waste acid and alkali recovery.

Method used

A monovalent selective cation exchange membrane coupled with dibenzo-18-crown-6 nanomaterials was prepared by a casting method. By introducing A18C6 and DHTA into the sulfonated polymer, a mixed matrix membrane of crown ether groups and sulfonic acid groups was formed, which promoted the transport and selective separation of K+, Na+ and Li+.

Benefits of technology

It achieves highly selective separation of Li+/Mg2+, Na+/Mg2+ and K+/Mg2+, with performance superior to commercial membranes. It is suitable for lithium extraction from salt lakes and crude salt refining, and the preparation method is simple and easy to operate.

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Abstract

This invention belongs to the field of cation exchange membranes and discloses a method for preparing a monovalent selective cation exchange membrane coupled with dibenzo-18-crown-6 nanomaterials. Utilizing the interaction between amino and sulfonic acids, diaminodibenzo-18-crown-6 (A18C6) is first added to a polymer, where A18C6 is immobilized near the sulfonate group. Then, 2,5-dihydroxyterephthalaldehyde (DHTA) is added, thereby achieving the growth of nanomaterials with crown ether structures around the sulfonate group. The crown ether structure exhibits electrostatic interactions with alkali metals, and the forces differ depending on the metal. A18C6 exhibits different forces with K... + Na + Li + The strength of the interaction with Mg 2+ The monovalent selective cation exchange membrane prepared by this invention is suitable for electrodialysis processes due to the action of the force.
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