Nanofiltration process has been perceived as one of the promising approaches in desalination and separation of monovalent/divalent salts. Despite significant progresses has been made in permeability and salt rejection, the industrial separation for monovalent/divalent salts is limited by the insufficient selectivity for ions with different charges and sizes. This work firstly proposed a porous organic cage supramolecular membrane with topologically structured “window-to-window” channels for the fast transport of monovalent ions and water molecules. Specifically, porous organic cage (RCC3) molecule and nonpolar alkyl of dodecyltrimethylammonium bromide (DTAB) were assembled into supramolecular RCC3@DTAB through hydrophobic interaction by molecular recognition of polar cavity. Furthermore, terephthaloyl chloride (TPC) was employed as a crosslinker by interfacial polymerization to construct RCC3@DTAB-TPC supramolecular film onto the surface of polydopamine modified polysulfone (PSf) substrate. The results suggested that RCC3@DTAB-TPC membrane displayed a high permeability of 13.9 L m⁻² h⁻¹ bar⁻¹, and attractive performance for monovalent/divalent salts separation and small molecule solutions desalination. The salt rejections to Na₂SO₄, MgSO₄, NaCl and MgCl₂ are 98.5%, 90.1%, 19.8% and 12.8%, and the selectivities of NaCl/Na₂SO₄ and NaCl/MgSO₄ reached 42.6 and 7.8, respectively. Besides, the separation factors for NaCl/medicine and NaCl/dye mixtures are 95.5 of δ_NaCl/DG and 76.6 of δ_NaCl/CR, respectively. The excellent separation performance of RCC3@DTAB-TPC supramolecular membrane provides a new idea for developing high-efficiency membranes for monovalent/divalent salts separation.

纳滤工艺被认为是脱盐和分离一价/二价盐的有前途的方法之一。尽管在渗透性和脱盐率方面取得了重大进展，但单价/二价盐的工业分离受到对不同电荷和大小离子的选择性不足的限制。这项工作首先提出了一种具有拓扑结构的“窗口到窗口”通道的多孔有机笼超分子膜，用于单价离子和水分子的快速传输。具体而言，多孔有机笼（RCC3）分子和十二烷基三甲基溴化铵（DTAB）的非极性烷基通过极性腔的分子识别通过疏水相互作用组装成超分子RCC3@DTAB。此外，以对苯二甲酰氯（TPC）为交联剂，通过界面聚合在聚多巴胺改性聚砜（PSf）基材表面构建RCC3@DTAB-TPC超分子膜。结果表明RCC3@DTAB-TPC膜具有13.9 L m的高渗透性^-2  h ^-1  bar ^-1，以及用于单价/二价盐分离和小分子溶液脱盐的有吸引力的性能。_{对Na 2} SO ₄、MgSO ₄、NaCl和MgCl ₂的脱盐率分别为98.5%、90.1%、19.8%和12.8%，对NaCl/Na ₂ SO ₄和NaCl/MgSO ₄的选择性分别达到42.6和7.8 . 此外，NaCl/药物和NaCl/染料混合物的分离因子分别为δ _{NaCl/DG 95.5和}δ _NaCl/CR 76.6， 分别。RCC3@DTAB-TPC超分子膜优异的分离性能为开发用于单价/二价盐分离的高效膜提供了新思路。