Covalent organic framework (COF)-based membranes are burgeoning candidates for separation technologies owing to their well-ordered channel structures. However, it is still a significant challenge to obtain high-quality COF membranes with a mild and convenient preparation strategy. In this paper, we adopted a simple liquid-liquid interfacial polymerization method to manufacture a self-standing COF membrane with decent crystallinity at room temperature. Aldehyde monomer and catalyst were dissolved in water as the bottom layer and the amine monomer was dissolved in ethyl acetate as the top layer, and new COF membranes were subsequently obtained by interfacial polymerization in the two-phase interface. The synthetic conditions including precursor and catalyst dosage were further optimized, and thus-synthesized PDA-TAPB-ABC membrane displayed a stable rejection to MB of 97.57% with a high water permeance of up to 101. 32 L mhbar. Its dyes separation performance was much better than their AA-stacking counterpart. Moreover, the prepared membrane endowed favorable chemical stability and long-term durability.

中文翻译：

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用于染料分离的自支撑ABC堆积共价有机框架膜的界面聚合

基于共价有机框架（COF）的膜由于其有序的通道结构而成为分离技术的新兴候选者。然而，通过温和、便捷的制备策略获得高质量的COF膜仍然是一个重大挑战。在本文中，我们采用简单的液-液界面聚合方法制备了室温下具有良好结晶度的自支撑COF膜。将醛单体和催化剂溶解在水中作为底层，胺单体溶解在乙酸乙酯中作为顶层，随后通过两相界面的界面聚合得到新的COF膜。进一步优化了前驱体和催化剂用量等合成条件，合成的 PDA-TAPB-ABC 膜对 MB 的稳定截留率为 97.57%，水渗透率高达 101. 32 L mhbar。其染料分离性能比 AA 堆积同类产品要好得多。此外，所制备的膜具有良好的化学稳定性和长期耐久性。