Organic solvent nanofiltration (OSN) has a good application prospect in the field of organic solvent separation, but low organic solvent permeance is the main obstacle restricting its application. This work reports a thin film composite (TFC) nanofiltration membrane prepared by interfacial polymerization (IP) on the HKUST-1 MOF interlayer grown in situ on a crosslinked polyimide (PI) substrate. The MOF interlayer improves the hydrophilicity and porosity of the support membrane. In addition, the MOF interlayer controls the diffusion of piperazine (PIP) during the IP process, which induced to form a thin and highly crosslinked polyamide (PA) separation layer. The increased effective membrane area and the reduced thickness of PA separation layer resulted in a methanol permeation flux up to 9.59 L·m·h·bar, while maintaining the rejection of the negatively charged Brilliant Blue G 250 dye (MW = 858.05 g·mol) at 98.8%. Furthermore, the stability of the TFC membranes in polar aprotic solvents such as N, N-dimethylformamide highlights their potential for OSN applications in chemical industries.

中文翻译：

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在聚酰亚胺基材表面原位生长金属有机骨架夹层，提高渗透性的有机溶剂纳滤膜


有机溶剂纳滤（OSN）在有机溶剂分离领域具有良好的应用前景，但有机溶剂渗透性低是限制其应用的主要障碍。这项工作报告了在交联聚酰亚胺（PI）基材上原位生长的 HKUST-1 MOF 中间层上通过界面聚合（IP）制备的薄膜复合（TFC）纳滤膜。 MOF中间层提高了支撑膜的亲水性和孔隙率。此外，MOF中间层在IP过程中控制哌嗪（PIP）的扩散，从而形成薄且高度交联的聚酰胺（PA）分离层。有效膜面积的增加和 PA 分离层厚度的减小使甲醇渗透通量高达 9.59 L·m·h·bar，同时保持对带负电的亮蓝 G 250 染料的截留率（MW = 858.05 g·mol） ）为 98.8%。此外，TFC 膜在 N,N-二甲基甲酰胺等极性非质子溶剂中的稳定性凸显了它们在化学工业中 OSN 应用的潜力。