Preparation of high permeability polyamide nanofiltration membranes by constructing stable 1D material interlayers

Water flux and ion sieving capability are the primary indicators determining the separation performance of nanofiltration membranes. Increasing the effective contact area between the membrane surface and water without sacrificing the membrane's density is a practical way to improve water flow while preserving salt rejection. By integrating hydrophilic nanoparticles during the interfacial polymerization process, it is feasible to indirectly modify the surface morphology of the nanofiltration membrane, so efficiently managing the generation and structure of the polyamide selective layer. Here it is suggested a technique that includes adding produced hydrophilic nanoparticles in one dimension to the interfacial polymerization process to form the polyamide composite membrane through interfacial polymerization. The fabricated ultrathin composite membrane exhibits a water flux of 19.4 Lm -2  h −1  bar −1 and a salt (Na 2 SO 4 ) rejection rate exceeding 93 %. Furthermore, due to the modification of the added nanomaterials, they can participate in the interfacial polymerization process, resulting in enhanced stability during prolonged testing.