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^(+)/Mg^(2+)、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^(+)/Mg^(2+)和K^(+)/Li^(+)体系中对K^(+)的选择性(PK^(+)Mg^(2+)=6.96,PK^(+)Li^(+)=3.73)高于商业的单价选择性阳离子交换膜CIMS(PK^(+)Mg^(2+)=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)。
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^(+)/Mg^(2+),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^(+)/Mg^(2+)and K^(+)/Li+binary systems(PK^(+)Mg^(2+)=6.96,PK^(+)Li+=3.73),which is superior to commercial monovalent selective cation exchange membrane(MSCEM)CIMS(PK^(+)Mg^(2+)=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).
作者
杨珊珊
姚宇洋
董云迪
徐志鹏
高尚上
阮慧敏
沈江南
YANG Shanshan;YAO Yuyang;DONG Yundi;XU Zhipeng;GAO Shangshang;RUAN Huimin;SHEN Jiangnan(College of Chemical Engineering,Zhejiang University of Technology,Hangzhou 310014,Zhejiang,China;College of Chemical Engineering,Shijiazhuang University,Shijiazhuang 050035,Hebei,China)
出处
《化工学报》
EI
CAS
CSCD
北大核心
2022年第4期1781-1793,共13页
CIESC Journal
基金
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)。