Laminar-structured covalent organic framework (COF) membranes hold great promise in molecular separation. Precise nanochannel manipulation of laminar-structured COF membranes is of critical significance. In this study, COF membranes are engineered by assembling COF-TbTG nanosheets and sulfobutylether-β-cyclodextrin (SCD) into laminar structures. The interlamellar spaces of COFs are regulated to achieve molecular sieving for precise separation; the intrinsic pores of COFs are utilized as fast molecule-transport channels. The obtained COF membranes exhibit a superior ethanol dehydration performance with a permeation flux of 5.2 kg m⁻² h⁻¹ and a separation factor of 1072, which exceeds the performances of state-of-the-art membranes for water/ethanol separation. Moreover, the optimal membranes show a steady permeation flux maintaining around 5.0 kg m⁻² h⁻¹ during a 72-h operation test. This work may provide a new approach to the design of molecular-sieving COF membranes for precise separation.

中文翻译：

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COF 膜具有快速且选择性的水传输通道，可实现高效的乙醇脱水

层状结构共价有机框架 （COF） 膜在分子分离方面前景广阔。层状结构 COF 膜的精确纳米通道作具有至关重要的意义。在本研究中，通过将 COF-TbTG 纳米片和磺丁基醚-β-环糊精 （SCD） 组装成层状结构来设计 COF 膜。调节 COF 的层间空间以实现分子筛分以实现精确分离;COF 的内禀孔隙被用作快速分子传输通道。获得的 COF 膜表现出优异的乙醇脱水性能，渗透通量为 5.2 kg ^{m-2 h-1}，分离因子为 1072，超过了最先进的水/乙醇分离膜的性能。此外，在 72 小时的运行测试中，最佳膜显示出稳定的渗透通量，保持在 5.0 kg ^{m-2 h-1} 左右。这项工作可能为设计分子筛 COF 膜提供一种新方法，以实现精确分离。