Polysulfone-graft-monoazabenzo-15-crown-5 ether (PSf-g-BN15C5) was synthesized via nucleophilic substitution reaction and used to prepare PSf-g-BN15C5/non-woven fabrics (NWF) composite membrane for lithium isotopes adsorptive separation by non-induced phase separation (NIPS). The influences of polymer concentration, additive and coagulation bath temperature on membrane properties were systematically explored. A solid–liquid dynamic extraction method was employed to investigate the lithium isotopes separation of the composite membrane. Results showed that the PSf-g-BN15C5/NWF composite membrane with a sponge-like pore structure, the porosity of 69% and the pure water flux of 1433 L/m²/h were obtained under the conditions: PSf-g-BN15C5 polymer concentration of 14 wt%, DMF as solvent and water as a non-solvent in coagulation bath at 60 °C. Moreover, it was found that the lithium isotopes equilibrium separation factor obtained from the membrane with immobilization amount (I_A) of 0.81 mmol/g was up to 1.052 ± 0.002, which was much higher than that obtained from the traditional liquid–liquid extraction system of H₂O-LiI/BN15C5-CHCl₃ (1.007 ± 0.002) and the solid–liquid static extraction using PSf-g-BN15C5 polymer (1.014 ± 0.002) as extractant. In brief, the composite membrane has a great potential application in the development of a green-friendly adsorptive separation method for lithium isotopes.

通过亲核取代反应合成了聚砜-接枝-单氮杂苯并-15-冠-5醚（PSf- g- BN15C5），用于制备PSf - g -BN15C5 /无纺布（NWF）复合膜，用于锂同位素吸附分离。非诱导相分离（NIPS）。系统地探讨了聚合物浓度，添加剂和混凝浴温度对膜性能的影响。固液动力萃取法用于研究复合膜的锂同位素分离。结果表明，PSf- g -BN15C5 / NWF复合膜具有海绵状孔结构，孔隙率为69％，纯水通量为1433 L / m ^2。在以下条件下获得/ h：在60℃的凝固浴中，PSf- g- BN15C5聚合物浓度为14wt％，DMF作为溶剂，水作为非溶剂。此外，发现固定化量（I _A）为0.81 mmol / g的膜所获得的锂同位素平衡分离系数高达1.052±0.002，远高于传统液-液萃取系统所获得的锂同位素平衡分离系数。H ₂ O-LiI / BN15C5-CHCl ₃（1.007±0.002）的分离，以及使用PSf- g进行的固液静态萃取-BN15C5聚合物（1.014±0.002）作为萃取剂。简而言之，该复合膜在开发绿色环保的锂同位素吸附分离方法中具有巨大的潜在应用前景。