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Preparation of ionic polyimide polymer membrane and separation performance of magnesium and lithium

Authors： LI Houyang1,2, MA Xiaohua1,2, LI Jianxin1,2

Units： 1. School of Materials Science and Engineering, Tiangong University, Tianjin 300387, China; 2. State Key Laboratory of Separation Membranes and Membrane Processes, Tiangong University, Tianjin 300387, China

KeyWords： crown ether; benzimidazole; polyimide; selective separation of magnesium and lithium

ClassificationCode：TQ028

year,volume(issue):pagination： 2024,44(6):1-9

Abstract：

In order to meet the increasing demand for lithium resources, diaminodibenzo-14-crown-4(DAB14C4), 2-(3,5-diaminophenyl)-benzimidazole (DABI) and 4,4-hexafluoroisopropyl phthalic anhydride (6FDA) were used. A novel polyimide polymer was prepared by polycondensation, quaternization and ion exchange reaction. Polymer porous membranes were prepared by NIPS method, and ion diffusion experiments were carried out. The results showed that crown ether-imidazole-based ionic polyimide polymer (PI-C-IL-NTf2) was successfully synthesized. The crown ether immobilization amount of PI-C-IL-NTf2 was 0.97 mmol/g, the imidazole immobilization amount was 0.51 mmol/g, NTf-2 anion substitution degree was 72%, molecular weight was 30 000, and glass transition temperature was 170.1 ℃. The prepared polymer porous membrane structure was dense in the upper layer, and the support layer was a through-hole structure that penetrates evenly; the average pore size was (8.95±0.4) nm, the porosity was (74.8±0.7)%, the mechanical strength was 5.2 MPa, the pure water contact angle was 71.2°, and the pure water permeability was 285 L/(m2·h·MPa). The permeation rates of porous membrane for Li+ and Mg2+ were 0.258 μm/s and 0.0455 μm/s respectively, and the Li/Mg separation factor was 9.49.

Funds：

国家自然科学基金项目（22278318）

AuthorIntro：

李厚阳（1999-），女，山东枣庄人，硕士生，主要研究方向为膜分离

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