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氨基苯并-15-冠-5接枝聚砜多孔膜填充膜色谱构建及锂同位素吸附分离性能研究

作者：刘丛丛¹， ²，裴洪昌¹， ²，刘耀龙¹， ³，严峰¹， ³，李建新¹， ²，崔振宇¹， ²，何本桥¹， ²

单位： 1天津工业大学分离膜与膜过程国家重点实验室/分离膜科学与技术国际联合研究中心，天津 300387；2天津工业大学材料科学与工程学院，天津 300387；3天津工业大学环境与化学化工学院，天津 300387

关键词： 4-氨基苯并-15冠-5接枝氯甲基化聚砜（PSf-g-AB15C5）；聚合物多孔膜；膜色谱；锂同位素分离；分离因子

DOI号：

分类号： TQ028.8

出版年,卷(期):页码： 2018,38(4):14-22

摘要：

本文以4-氨基苯并-15-冠-5（AB15C5）和氯甲基化聚砜（CMPSf）为原料，通过亲核取代制备4-氨基苯并-15-冠-5接枝氯甲基化聚砜聚合物（PSf-g-AB15C5），并采用反应-控制浸没沉淀相转化法制备冠醚接枝聚砜多孔膜。以该膜为填充介质，采用层层叠加方法构筑出20层膜色谱柱，以淋洗色谱法探索其锂同位素吸附分离规律及膜色谱分离动力学。结果表明，相较于原始丰度，膜色谱一次淋洗对7Li和6Li丰度分别提升了0.06%和0.04%。7Li富集在色谱带前端，6Li富集在色谱带后端；膜色谱分离因子为1.014。冠醚接枝聚砜聚合物膜对锂离子的吸附过程更适合于准二级动力学方程，其吸附速率的大小由化学吸附所控制。

4-aminobenzo-15-crown-5 (AB15C5) as the membrane ligand and chloromethylated polysulfone (CMPSf) as bulk polymer were used to prepare polysulfone-graft-4’-aminobenzo-15-crown-5-ether (PSf-g-AB15C5) polymer via nucleophilic substitution, which was employed to fabricate PSf-g-AB15C5 porous membrane by immersion precipitation phase inversion method. 20 layers of porous membranes as media were packed by layer by layer in a chromatography column with 75 mm (height) ×24 mm (I.D). The elution chromatography method was used to study the adsorption kinetics and lithium isotopes separation performance by PSf-g-AB15C5 membrane chromatography. The results showed that the membrane chromatography process for lithium isotopes separation fitted pseudo-second-order kinetic model. That is to say, the lithium ions were adsorbed by PSf-g-AB15C5 porous membrane through the chemisorption. Compared with the original abundance, the abundance of 7Li and 6Li increased 0.06% and 0.04%, respectively. The heavier isotope, 7Li is enriched at the front boundary, whereas the lighter isotope, 6Li enriched at the rear boundary of the band. A single separation factor was up to 1.014. In a word, this study provides a new pave for a green and efficient separation of lithium isotope.

基金项目：

长江学者和创新团队发展计划（IRT-17R80）及国家自然科学基金项目（51303130、21376176）

作者简介：

第一作者简介：刘丛丛（1992-），女，山东聊城人，硕士生，从事分离膜及锂同位素分离研究。 *通讯作者：李建新，E-mail：jxli@tjpu.edu.cn

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