Abstract Recently, engineering the sublayer of polyamide thin film composite (PA-TFC) membrane by functional nanomaterials at nanoscale has been developed as an effective strategy to control interfacial polymerization reaction to fabricate high-performance reverse osmosis (RO) membrane. However, a reliable and practical manipulation technique is still needed to overcome the limitation of conventional sublayers. In this work, an approach of using atomic layer deposited (ALD) monomer-affinitive titanium dioxide (TiO2) nanofilm to modify the sublayer of TFC was proposed to form a thin, smooth, and highly cross-linked PA selective top layer. The functional TiO2 nanofilm increases the affinity between modified sublayer and amine monomer in favor of the efficient and subtle tuning of the adsorption and diffusion of amine monomer during the interfacial polymerization process. The obtained TFC membrane with optimal ALD TiO2 coverage demonstrates well-improved RO performance in terms of high permeance of 1.8 L.m−2.h−1.bar−1 and high salt rejection rate of 96.1% in a dead-end process. This work reveals that coating functional nanomaterials by ALD is a practical manipulation technique toward the controllable fabrication of promising TFC membrane and the optimization of sublayer materials.

中文翻译：

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具有功能性 TiO2 纳米膜的亚层的原子尺度操纵朝向高性能反渗透膜

摘要 近年来，通过纳米级功能纳米材料对聚酰胺薄膜复合（PA-TFC）膜的亚层进行工程化已成为控制界面聚合反应以制造高性能反渗透（RO）膜的有效策略。然而，仍然需要一种可靠且实用的操作技术来克服传统子层的局限性。在这项工作中，提出了一种使用原子层沉积 (ALD) 单体亲和二氧化钛 (TiO2) 纳米膜来修饰 TFC 子层的方法，以形成薄、光滑且高度交联的 PA 选择性顶层。功能性 TiO2 纳米膜增加了改性亚层和胺单体之间的亲和力，有利于在界面聚合过程中有效和微妙地调节胺单体的吸附和扩散。获得的具有最佳 ALD TiO2 覆盖率的 TFC 膜在 1.8 Lm-2.h-1.bar-1 的高渗透率和 96.1% 的高脱盐率方面表现出良好的 RO 性能。这项工作表明，通过 ALD 涂覆功能性纳米材料是一种实用的操作技术，可用于可控制造有前景的 TFC 膜和优化亚层材料。1% 处于死胡同中。这项工作表明，通过 ALD 涂覆功能性纳米材料是一种实用的操作技术，可用于可控制造有前景的 TFC 膜和优化亚层材料。1% 处于死胡同中。这项工作表明，通过 ALD 涂覆功能性纳米材料是一种实用的操作技术，可用于可控制造有前景的 TFC 膜和优化亚层材料。