Zhang Xin, Zhang Xu, Xu Lushen, Zhang Guoliang, Meng Qin
Center for Membrane and Water Science & Technology, Collaborative Innovation Center of Membrane Separation and Water Treatment of Zhejiang Province, Zhejiang University of Technology, Hangzhou 310014, China.
College of Chemical and Biological Engineering, and State Key Laboratory of Chemical Engineering, Zhejiang University, Yugu Road 38#, 310027 Hangzhou, China.
ACS Appl Mater Interfaces. 2024 Mar 20;16(11):14321-14332. doi: 10.1021/acsami.3c19291. Epub 2024 Mar 6.
High-quality thin-film composite (TFC) membranes with high selectivity and permeability have great significance owing to their practical applications, specifically for the accurate differentiation of monovalent and divalent ions. However, the trade-off effect between selectivity and permeability is still a big challenge due to the difficult structure adjustment of the selective layer. Herein, polydopamine (PDA) functionalized with a hydrophobic long alkane chain was first explored as a functional amphiphilic interlayer to synthesize high-quality TFC membranes via a confined interfacial polymerization (IP) reaction. The amphiphilic interlayer not only restricted the formation of the polyamide (PA) matrix in the pores of the substrate but also accelerated spatially more homogeneous polymerization and formed a PA active layer with a more uniform pore size distribution. The method may provide an effective principle for the construction of versatile polyamide-based membranes with high perm-selectivity on various supports. The NaCl/NaSO separation factor of the D-8/PA membrane reached as high as 204.07, while the flux increased up to 25.71 L m h bar. This progress provides a more feasible way for the construction of high-quality TFC membranes with a devisable and creative amphiphilic interlayer for industrial application.
具有高选择性和渗透性的高质量薄膜复合（TFC）膜因其实际应用而具有重要意义，特别是对于单价和二价离子的精确区分。然而，由于选择性层的结构调整困难，选择性和渗透性之间的权衡效应仍然是一个巨大的挑战。在此，首次探索了用疏水性长链烷烃官能化的聚多巴胺（PDA）作为功能性两亲性中间层，通过受限界面聚合（IP）反应合成高质量的TFC膜。两亲性中间层不仅限制了聚酰胺（PA）基质在基材孔中的形成，而且在空间上加速了更均匀的聚合，并形成了孔径分布更均匀的PA活性层。该方法可为在各种载体上构建具有高渗透选择性的通用聚酰胺基膜提供有效原理。D-8/PA膜的NaCl/NaSO分离因子高达204.07，而通量增加到25.71 L m h bar。这一进展为构建具有可设计和创造性两亲性中间层的高质量TFC膜用于工业应用提供了更可行的方法。
