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A novel membrane chromatography with PSf-g-AB15C5 microporous membrane for lithium isotopes adsorptive separation

Authors： LIU Congcong1, 2, PEI Hongchang1, 2, LIU Yaolong1, 3,YAN Feng1, 3, LI Jianxin1, 2*, CUI Zhenyu1, 2, HE Benqiao1, 2

Units： 1 State Key Laboratory of Separation Membranes and Membrane Processes / National Center for International Joint Research on Separation Membranes, Tianjin Polytechnic University, Tianjin 300387, 2 School of Materials Science and Engineering, Tianjin Polytechnic University, Tianjin 300387, 3 School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387

KeyWords： polysulfone-graft-4’-aminobenzo-15-crown-5-ether (PSf-g-AB15C5); porous polymeric membrane; membrane chromatography; lithium isotope separation; separation factor

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2018,38(4):14-22

Abstract：

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.

Funds：

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）

AuthorIntro：

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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