The thin-film composite (TFC) nanofiltration (NF) membrane is an excellent choice to solve water shortage based on the advantages of high flux and selective separation. However, the current NF membrane still causes a tremendous amount of energy consumption in the practical applications due to the limitation of flux. In this work, dextran nanoparticles (DNPs) with the cross-linked organic components, numerous hydrophilic groups and internal cavities were added into the aqueous phase solution, and novel NF membranes were fabricated by adjusting the concentration and particle size of DNPs to control the interfacial polymerization (IP) reaction. After modification, the decrease of membrane thickness and the increase of surface hydrophilicity improved the separation performance of NF membrane. The water flux of NF membrane with 0.5 wt% DNPs doping was up to 211.2 Lm⁻²h⁻¹MPa⁻¹, which was more than twice as high as the unmodified membrane with Na₂SO₄ retention up to above 98%. It was also worth mentioning that the modified membrane indicated excellent monovalent/divalent ion selectivity and anti-fouling performance. This strategy of improving membrane performance by controlling the concentration and particle size of the aqueous phase additives with the advantages of simplicity and universality provides a certain impetus for the development of TFC membrane.

基于高通量和选择性分离的优势，薄膜复合（TFC）纳滤（NF）膜是解决缺水问题的绝佳选择。然而，由于通量的限制，目前的NF膜在实际应用中仍然会造成巨大的能量消耗。在这项工作中，将具有交联有机组分、大量亲水基团和内腔的葡聚糖纳米颗粒 (DNPs) 添加到水相溶液中，并通过调节 DNPs 的浓度和粒径来控制界面制备新型 NF 膜。聚合 (IP) 反应。改性后膜厚的降低和表面亲水性的增加提高了纳滤膜的分离性能。NF膜的水通量为0。^-2 h ^-1 MPa ^-1，是未改性膜的两倍多，Na ₂ SO ₄保留率高达98%以上。还值得一提的是，改性膜显示出优异的单价/二价离子选择性和防污性能。这种通过控制水相添加剂的浓度和粒径来提高膜性能的策略具有简单通用的优点，为TFC膜的发展提供了一定的推动力。