Partitioning COF Membrane Channels into Ultramicroporous and π‐Electron‐Rich Compartments for Multicomponent Ion Separations

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Abstract
Covalent organic frameworks (COFs) build a versatile platform for constructing separation membranes, affording them disruptive candidates for nanoscale molecule/ion sieving. However, the reported aperture of COFs mainly concentrates on 0.8–10.0 nm, leaving a daunting challenge in fabrication of ultramicroporous (+ /Mg 2+ /(K + ) and F − /SO 4 2− /(Cl − ). Example of dealing with a K + /Li + /Mg 2+ ternary mixture, the optimum p ‐TpPa‐C≡CH membrane exhibits an actual selectivity of 101.2 for K + /Mg 2+ and 30.9 for Li + /Mg 2+ . The strong adaptability and wide range of application scenarios of our COF membranes exceed the ever‐reported membranes. This work provides a fundamental to comprehending the channel manipulation mechanisms and advances the development of high‐performance ion separation membranes.
Funding Information
  • National Natural Science Foundation of China (22408211, 22371165)
  • Higher Education Discipline Innovation Project (D20015)

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