Abstract Interfacial matching optimization between polyamide (PA) layer and porous substrate is crucial for an efficient thin-film-composite (TFC) membrane for desalination. In this study, TFC membranes were prepared via interfacial polymerization, and a series of single-walled carbon nanotubes (SWCNTs) interlayers with single-side dopamine-polyethyleneimine (DA-PEI) post-modification was constructed to regulate the interfacial matching. Interlayer robustness was enhanced by the synergic interactions of π−π stacking among CNTs and packing effect of DA-PEI deposition. The effects of interlayer on the microstructure and separation performance of PA layers were systematically investigated. It indicated that compared to the membrane without interlayers, a more hydrophilic interlayer facilitated to form a more uniform, more robust, thinner and denser PA layer. The resulting TFC membrane exhibited a superior performance in both RO test and FO test, compared to the most available commercially and reported membranes in literature. A high H2O/NaCl selectivity (permeance ratio, A/B) of 44.0 bar−1 was achieved in RO test. A high water flux of 51.3 L m−2 h−1 with a relatively superior H2O/NaCl selectivity (reverse salt flux/water flux, Js/Jv of 0.16 g L−1) was achieved in FO mode. This work paved a way to understand the crucial roles of interfacial regulation between PA layer and substrate.

中文翻译：

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通过单侧后改性碳纳米管网络界面调节聚酰胺膜的微观结构和脱盐性能

摘要 聚酰胺 (PA) 层与多孔基材之间的界面匹配优化对于用于脱盐的高效薄膜复合 (TFC) 膜至关重要。在这项研究中，TFC 膜通过界面聚合制备，并构建了一系列单壁多巴胺-聚乙烯亚胺 (DA-PEI) 后修饰的单壁碳纳米管 (SWCNT) 夹层以调节界面匹配。碳纳米管之间的 π-π 堆积和 DA-PEI 沉积的堆积效应的协同相互作用增强了层间的稳健性。系统地研究了夹层对 PA 层的微观结构和分离性能的影响。它表明，与没有夹层的膜相比，更亲水的夹层有助于形成更均匀、更坚固、更薄和更致密的 PA 层。与最常见的市售膜和文献报道的膜相比，所得 TFC 膜在 RO 测试和 FO 测试中均表现出优异的性能。在 RO 测试中实现了 44.0 bar-1 的高 H2O/NaCl 选择性（渗透率，A/B）。在 FO 模式下实现了 51.3 L m-2 h-1 的高水通量和相对优越的 H2O/NaCl 选择性（反向盐通量/水通量，Js/Jv 为 0.16 g L-1）。这项工作为理解 PA 层和基材之间的界面调节的关键作用铺平了道路。在 FO 模式下实现了具有相对优越的 H2O/NaCl 选择性（反向盐通量/水通量，Js/Jv 为 0.16 g L-1）的 3 L m-2 h-1。这项工作为理解 PA 层和基材之间的界面调节的关键作用铺平了道路。在 FO 模式下实现了具有相对优越的 H2O/NaCl 选择性（反向盐通量/水通量，Js/Jv 为 0.16 g L-1）的 3 L m-2 h-1。这项工作为理解 PA 层和基材之间的界面调节的关键作用铺平了道路。