Hydrophilic and porous nanofillers have shown great benefits in the attainment of high-performance nanofiltration (NF) membranes. In this work, a novel nanoporous covalent organic framework (NCOF) was facilely synthesized under mild conditions and deposited onto a polyethersulfone substrate to induce formations of crumpled polyamide layers via interfacial polymerization. With the incorporation of NCOFs, the surface of the COF-based thin-film nanocomposite (CTN) membranes gradually transformed from tent-like to mesh morphology, which significantly enhanced the water permeance owing to the increased effective membrane filtration area and additional water transport channels provided by NCOFs. Besides, the favorable compatibility between NCOFs and the polyamide layer endowed the CTN membranes with high rejection capacities to a variety of solutes. The optimal membrane with the NCOF deposition density of 19.27 μg cm⁻², CTN9 membrane, showed nearly twice higher water permeance of 15.5 L m⁻² h⁻¹ bar⁻¹ while maintaining high rejections of Na₂SO₄ and MgCl₂ (98.9% and 94.2%, respectively). In addition, the CTN membranes exhibited a satisfying stability during the long-term filtration of saline solutions as well as an improved antifouling ability to the model foulants of bovine serum albumin. The superior NF performance rendered the NCOF functionalized membranes highly promising for water treatment.

亲水性和多孔性纳米填料在获得高性能纳米过滤（NF）膜方面已显示出巨大的优势。在这项工作中，一种新颖的纳米多孔共价有机骨架（NCOF）在温和条件下被合成轻便和沉积到基板聚醚砜以诱导折皱聚酰胺层的地层通过界面聚合。随着NCOF的加入，基于COF的薄膜纳米复合材料（CTN）膜的表面逐渐从帐篷状转变为网状形态，这归因于有效膜过滤面积的增加和附加的水传输通道，从而大大提高了水的渗透性由NCOF提供。此外，NCOF和聚酰胺层之间的良好相容性使CTN膜对各种溶质具有高排斥能力。最佳膜的NCOF沉积密度为19.27μgcm ^-2，即CTN9膜，在保持较高的Na ₂ SO截留率的同时，其水渗透率达到15.5 L m ^-2  h ^-1 bar ^-1的两倍。₄和MgCl ₂（分别为98.9％和94.2％）。此外，CTN膜在长期过滤盐溶液期间表现出令人满意的稳定性，并且对牛血清白蛋白的模型污垢物具有改进的防污能力。出色的NF性能使NCOF功能化膜极有希望用于水处理。