Abstract Covalent organic frameworks (COFs) have emerged as promising candidate for the construction of advanced separation membranes due to their well-defined pore structure and highly ordered porous channels. Nevertheless, the implementation of high-efficient COFs-incorporated membranes still suffers from harsh synthetic conditions and possible agglomeration of COFs. Herein, a kind of sandwich-like thin film composite reverse osmosis (RO) membranes was fabricated to overcome such challenges via interfacial assembly of a COFs interlayer on polysulfone substrate, then followed by the formation of a polyamide skin layer via traditional interfacial polymerization (IP) process. The COFs interlayer not only tailored the pore structure and interfacial properties of the substrate, but also manipulated the uptake and release of the amine monomer during the IP process, which would contribute to forming a more ordered polyamide separation layer. The resultant COFs-interlayered RO membrane exhibited a nearly 33.8% higher water permeance (16.78 L m−2 h−1 MPa−1) along with a slightly increased NaCl rejection (99.2%) compared with the pristine RO membrane. More importantly, the emerging RO membrane presented a superior chemical (critic acid and NaOH) resistance and desirable long-term filtration stability, which paved a new pathway to construct high-performance RO membranes for desalination.

中文翻译：

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具有界面组装共价有机框架夹层的新型三明治式反渗透膜，用于高效脱盐

摘要 共价有机骨架 (COF) 因其明确的孔结构和高度有序的多孔通道而成为构建先进分离膜的有希望的候选材料。然而，高效的 COFs 结合膜的实施仍然受到苛刻的合成条件和可能的 COFs 团聚的影响。在此，通过在聚砜基材上进行 COFs 夹层的界面组装，制造了一种夹层状薄膜复合反渗透 (RO) 膜以克服这些挑战，然后通过传统的界面聚合 (IP) 形成聚酰胺表层。 ） 过程。COFs 夹层不仅调整了基材的孔结构和界面特性，而且还控制了 IP 过程中胺单体的吸收和释放，这将有助于形成更有序的聚酰胺分离层。与原始 RO 膜相比，所得 COFs 夹层 RO 膜的水渗透率（16.78 L m-2 h-1 MPa-1）高出近 33.8%，同时 NaCl 截留率（99.2%）略有增加。更重要的是，新兴的反渗透膜表现出优异的耐化学性（临界酸和氢氧化钠）和理想的长期过滤稳定性，为构建高性能反渗透膜用于海水淡化铺平了新途径。78 L m-2 h-1 MPa-1) 以及与原始 RO 膜相比略微增加的 NaCl 截留率 (99.2%)。更重要的是，新兴的反渗透膜表现出优异的耐化学性（临界酸和氢氧化钠）和理想的长期过滤稳定性，为构建高性能反渗透膜用于海水淡化铺平了新途径。78 L m-2 h-1 MPa-1) 以及与原始 RO 膜相比略微增加的 NaCl 截留率 (99.2%)。更重要的是，新兴的反渗透膜表现出优异的耐化学性（临界酸和氢氧化钠）和理想的长期过滤稳定性，为构建高性能反渗透膜用于海水淡化铺平了新途径。