膜科学与技术

表面接枝法荷正电复合纳滤膜制备及其镁锂分离性能

作者：张桢琳，王露，程亮，杨虎，汤永健，许振良

单位：化学工程联合国家重点实验室，华东理工大学化学工程研究所，膜科学与工程研发中心，上海200237

关键词：表面接枝；纳滤膜；氧化石墨烯；镁锂分离

出版年,卷(期):页码： 2024,44(2):1-7

摘要：

以哌嗪（PIP）与均苯三甲酰氯（TMC）界面聚合制备PA 纳滤膜作为底膜，利用聚乙烯亚胺（PEI）与氧化石墨烯（GO）混合溶液对其表面接枝，并制备PEI-GOS纳滤膜。通过扫描电镜（SEM)、Zeta点位和接触角等仪器对其微观形貌、表面电荷和水接触角等进行表征，在溶液总质量浓度1 000 mg/L （锂镁质量浓度比为50）的条件下，考察了纳滤膜的锂镁分离性能，结果表明，PEI-GOS纳滤膜具有致密平滑的聚酰胺层，膜表面荷正电，纯水通量可达50.1 L·m-2·h-1·MPa-1，对Mg2+具有良好的截留性能。PEI-GOS纳滤膜镁锂分离因子可达38.1，具备良好的镁锂分离性能。

PA nanofiltration membranes were prepared by interfacial polymerization of piperazine(PIP) and trimesoyl chloride(TMC) as the base membrane, and PEI-GOS nanofiltration membranes were prepared by surface grafting using a mixture of polyethyleneimine (PEI) and graphene oxide (GO).The results showed that the PEI-GOS nanofiltration membrane has a dense and smooth polyamide layer with a large positive charge on the membrane surface, and the pure water flux can reach 50.1 L·m-2·h-1·MPa-1 with excellent retention performance of Mg2+. The Mg-lithium separation factor of PEI-GOS nanofiltration membrane can reach 38.1, which has excellent Mg-Li separation performance.

张桢琳（1998-），男，四川成都市人，硕士生，研究方向为膜制备与应用

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