Conventional interfacial polymerization (IP) requires excessive amounts of reactive monomers and solvents due to the dip-coating method. Herein, we report a rod-coating assisted IP process to prepare nanofiltration (NF) membranes. The results demonstrate that a perfect PA layer can be fabricated by using low monomer dosages of PIP (0.08 g/m²) and TMC (0.016 g/m²). This can significantly reduce the consumption of monomers and organic solvents, and effectively avoid the waste of hazardous and expensive chemicals. Thanks to the fewer monomer dosages, the prepared NF membranes were much thinner and looser, which significantly improved the membrane permeability. The highest permeance of the rod-coated membranes reached 204.0 L/(m² h MPa), which was increased by ∼251% compared to the dip-coated NF membrane. More importantly, the rod-coated membranes possessed excellent Na₂SO₄ rejections (>99.0%) and ultralow NaCl rejections (<14.4%). And the maximum NaCl/Na₂SO₄ selective efficiency reached 125.7, which was about 7 folds to that of the dip-coated NF membrane. This study suggests that the rod-coating method is highly feasible for the preparation of polyamide NF membranes with high performance. It is reasonable to expect that this rod-coating assisted IP process offers a new approach to fabricating NF membranes.

由于浸涂法，传统的界面聚合 (IP) 需要过量的反应性单体和溶剂。在此，我们报告了一种棒涂辅助 IP 工艺来制备纳滤 (NF) 膜。结果表明，使用低单体剂量的 PIP (0.08 g/m ² ) 和 TMC (0.016 g/m ² ) 可以制造出完美的 PA 层。这可以显着减少单体和有机溶剂的消耗，有效避免危险和昂贵化学品的浪费。由于单体用量较少，制备的纳滤膜更薄、更松散，显着提高了膜的通透性。棒涂膜的最高渗透率达到204.0 L/(m ² h MPa)，与浸涂纳滤膜相比提高了~251%。更重要的是，棒涂膜具有出色的 Na ₂ SO ₄截留率 (>99.0%) 和超低的 NaCl 截留率 (<14.4%)。_{NaCl/Na 2} SO ₄的最大选择效率达到125.7，是浸涂纳滤膜的7倍左右。该研究表明棒涂法制备高性能聚酰胺纳滤膜具有高度可行性。有理由期待这种棒状涂层辅助 IP 工艺提供了一种制造 NF 膜的新方法。