Herein, thin-film composite membranes consisting of poly(m-phenyleneisophthalamide) substrate and polyamide active layer were constructed by transition metal ion-assisted interfacial polymerization method. As compared to the traditional polyamide membranes, a much thinner polyamide layer (33 vs. 200 nm) can be synthesized with higher permeance (3.2 vs. 0.62 L m⁻² h⁻¹ bar⁻¹) in the organic solvent nanofiltration. Similarly, the prepared membranes maintained a high rejection (>99%) for various dyes. Optimal membranes prepared by using Co²⁺ exhibited strong tolerance to various organic solvents with good long-term stability. Positron annihilation spectroscopy and other characterization methods were used to investigate the relationships between the membrane microstructures and the enhanced separation performance. Based on molecular dynamics simulation, it was found that the diffusion coefficient of polyethyleneimine monomer decreased by about 18 times after adding Co²⁺ to the aqueous solution (forming coordination interaction). This procedure has great potential and sustainability for practical organic solvent nanofiltration applications.

中文翻译：

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金属离子辅助界面聚合法增强有机溶剂纳滤性能的聚酰胺复合膜

在此，采用过渡金属离子辅助界面聚合法构建了由聚（间苯二甲酰间苯二胺）基底和聚酰胺活性层组成的薄膜复合膜。与传统的聚酰胺膜相比，在有机溶剂纳滤中可以合成具有更高渗透性（3.2 对 0.62 L m ^-2  h ^-1  bar ^{-1 ）的更薄的聚酰胺层（33 对 200 nm）。}同样，制备的膜对各种染料保持高排斥率 (>99%)。Co ^{2+制备的最佳膜}对多种有机溶剂表现出很强的耐受性，具有良好的长期稳定性。正电子湮没光谱和其他表征方法用于研究膜微结构与增强分离性能之间的关系。基于分子动力学模拟发现，在水溶液中加入Co ^{2+ （形成配位相互作用）后，聚乙烯亚胺单体的扩散系数降低了约18倍。}该程序对于实际的有机溶剂纳滤应用具有巨大的潜力和可持续性。