CIESC Journal ›› 2022, Vol. 73 ›› Issue (4): 1781-1793.DOI: 10.11949/0438-1157.20211846

• Material science and engineering, nanotechnology • Previous Articles     Next Articles

Preparation and performance of ion exchange membrane with K+ selectivity based on dibenzo-18-crown-6 modification

Shanshan YANG1,2(),Yuyang YAO1,Yundi DONG1,Zhipeng XU1,Shangshang GAO1,Huimin RUAN1,Jiangnan SHEN1()   

  1. 1.College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
    2.College of Chemical Engineering, Shijiazhuang University, Shijiazhuang 050035, Hebei, China
  • Received:2021-12-30 Revised:2022-02-10 Online:2022-04-25 Published:2022-04-05
  • Contact: Jiangnan SHEN

基于二苯并-18-冠-6基体改性的K+选择性离子交换膜的制备及性能研究

杨珊珊1,2(),姚宇洋1,董云迪1,徐志鹏1,高尚上1,阮慧敏1,沈江南1()   

  1. 1.浙江工业大学化学工程学院,浙江 杭州 310014
    2.石家庄学院化工学院,河北 石家庄 050035
  • 通讯作者: 沈江南
  • 作者简介:杨珊珊(1990—),女,博士,yangss97@163.com
  • 基金资助:
    国家自然科学基金项目(21878273);国家自然科学青年基金项目(22008214);浙江省重点研发计划项目(2021C03170);浙江省自然科学青年基金项目(LQ20B060005)

Abstract:

Based on the fact that the 18-crown-6 ether ring cavity can form a 1∶1 stable complex with K+, 4,4'-diamino-dibenzo-18-crown-6 (A18C6) was introduced into the ion-exchange membrane-based material and formed into a membrane, and then A18C6 molecules were cross-linked and immobilized with 1,3,5-benzenetricarbonyl chloride (TMC) to obtain a series of modified cation-exchange membranes. By changing the content of A18C6 and the reaction time of TMC to adjust the matrix structure of CEMs, the ED permselectivity to K+ for the modified membranes in binary systems of K+/Mg2+, K+/Na+ and K+/Li+ were systematically investigated. At a constant current density of 5.0 mA·cm-2, the modified membrane M-A18C6-10%-T30 shows prominent permselectivity to K+ in K+/Mg2+ and K+/Li+ binary systems (PMg2+K+=6.96,PLi+K+=3.73), which is superior to commercial monovalent selective cation exchange membrane (MSCEM) CIMS (PMg2+K+=5.36). The introduction of A18C6 improves the compactness of membrane matrix (pore-size sieving effect) and further provides new ion transport channels for K+ (ion-dipole interaction).

Key words: membranes, electrodialysis, ion exchange, 4,4'-diamino-dibenzo-18-crown-6, selectivity

摘要:

基于18-冠-6醚环腔体可与K+形成1∶1型稳定的络合物,通过掺杂的方式将4,4'-二氨基-二苯并-18-冠-6(A18C6)引入离子交换膜基材料中并成膜,然后利用1,3,5-苯三甲酰氯(TMC)对A18C6分子进行交联固定,制得一系列改性阳离子交换膜。通过改变A18C6的含量和TMC的反应时间来调控阳离子交换膜的基体结构,系统考察了改性膜在K+/Mg2+、K+/Na+ 和K+/Li+的二元体系中对K+的电渗析选择性。研究结果表明,在电流密度为5.0 mA·cm-2的条件下,最优膜M-A18C6-10%-T30在K+/Mg2+和K+/Li+体系中对K+的选择性(PMg2+K+=6.96PLi+K+=3.73)高于商业的单价选择性阳离子交换膜CIMS(PMg2+K+=5.36)。A18C6的掺杂引入不仅提高了膜基体的致密性(孔径筛分效应),也为K+在膜基体中的传输提供了新的离子传输通道(离子-偶极作用)。

关键词: 膜, 电渗析, 离子交换, 4, 4'-二氨基-二苯并-18-冠-6, 选择性

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