Humanity is facing a global challenge of dwindling water resources and the situation is intensifying due to growing population leading to excessive water pollution. Nanofiltration is an important membrane-based technology for the production of clean and potable water for domestic and industrial setups. Hyper-cross-linked polyamide thin film composite nanofiltration (HCPA-TFC-NF) membranes have been fabricated by using multifunctional amine 1 (possessing two primary -NH₂ and two secondary -NH groups) and bifunctional terephthaloyl chloride 2 (TPC) through interfacial polymerization. The structure of the hyper-cross-linked polyamide network has been successfully confirmed by solid (CP-MAS) ¹³C NMR, XPS, AFM, FT-IR, elemental mapping, and EDX analysis. The membrane features such as surface morphology and hydrophilicity have been established by FE-SEM and water contact angle measurements. The FE-SEM analysis revealed the formation of uniform polyamide active layer on the surface of PS/PET support, and the pore structure of the membranes was tuned by studying the effect of curing temperature and curing time. The nanofiltration membranes efficiently rejected a series of divalent salts including MgCl₂, CaCl₂, Na₂SO₄, MgSO_4, and NaCl using cross-flow filtration setup. Based on the cross-flow filtration performance, the best conditions for the membrane fabrication were found to be curing temperature of 80 °C with a curing time of 1 h. The highest salt rejection was observed in case of MgCl₂ reaching to a value of 98.11% in case of HCPA-TFC-NF@M3 and it was found to be 97.45% in case of HCPA-TFC-NF@M2 while the rejection of MgCl₂ was reduced to 94.59% in case HCPA-TFC-NF@M1. HCPA-TFC-NF@M2 showed NaCl rejection of 87.36%. The hydrofluoric acid treatment of HCPA-TFC-NF-M2 increased the water flux while keeping the rejection high. The HCPA-TFC-NF@M2 showed a rejection of >99% for EBT with a permeate flux of 75 LMH.

人类正面临水资源日益减少的全球​​性挑战，而且由于人口增长导致水污染过度，这种情况正在加剧。纳滤是一种重要的基于膜的技术，用于为家庭和工业设备生产清洁和饮用水。采用多功能胺1（具有两个伯-NH ₂和两个仲-NH 基团）和双官能对苯二甲酰氯2 (TPC) 通过界面制备超交联聚酰胺薄膜复合纳滤 (HCPA-TFC-NF) 膜。聚合。超交联聚酰胺网络的结构已被固体 (CP-MAS) ^{13成功证实}C NMR、XPS、AFM、FT-IR、元素映射和 EDX 分析。通过 FE-SEM 和水接触角测量确定了膜的表面形态和亲水性等特征。FE-SEM 分析表明，在 PS/PET 支撑体表面形成了均匀的聚酰胺活性层，通过研究固化温度和固化时间的影响来调整膜的孔结构。纳滤膜有效地滤除一系列二价盐，包括 MgCl ₂、CaCl ₂、Na ₂ SO ₄、MgSO _{4 、}和 NaCl 使用错流过滤装置。基于错流过滤性能，发现膜制备的最佳条件是固化温度为 80 ℃，固化时间为 1 小时。_{MgCl 2}的脱盐率最高，HCPA-TFC-NF@M3 达到 98.11%，HCPA-TFC-NF@M2 达到 97.45%，而在 HCPA-TFC-NF@M1 的情况下， MgCl ₂降低到 94.59%。HCPA-TFC-NF@M2 的 NaCl 排斥率为 87.36%。HCPA-TFC-NF-M2 的氢氟酸处理增加了水通量，同时保持较高的排斥率。HCPA-TFC-NF@M2 对 EBT 的拒绝率 > 99%，渗透通量为 75 LMH。