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Enhanced synergistic coordination in 2D Janus covalent organic framework membranes for efficient Sr/Y ion separation

Separation and Purification Technology, ISSN: 1383-5866, Vol: 360, Page: 131120
2025
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Article Description

The relatively large pore sizes (typically around 1 nm) and the prevalence of defect sites make it challenging for covalent organic framework (COF) membranes to efficiently separate sub-nanometer scale ions. In this study, we customized four types of 2D Janus COF membranes using the acetic acid buffering interlayer interface method. By leveraging the design flexibility of COFs, we finely tuned the positioning of functional groups on the pore walls to achieve the preparation of 2D Janus COF membranes with enhanced synergistic coordination properties, which were then employed for the efficient separation of Sr and Y ions. The different relative positions of phenolic hydroxyl groups on the pore walls impart distinct coordination states with respect to Sr and Y ions, whereby COF membranes with ortho -hydroxyl configurations exhibit enhanced synergistic coordination capabilities compared to those with para -hydroxyl configurations. Screening experiments revealed that, with the same number of hydroxyl groups, the COF membranes featuring ortho -hydroxyl groups demonstrated a greater tendency to coordinate with Y (III) ions compared to those with para -hydroxyl groups, mainly due to the additional binding site provided by the ortho configuration. In the Sr/Y separation system, the selectivity of the COF membrane with synergistic coordination ability was as high as 99.7 % for Sr (II), maintaining selectivity above 95.8 % even after five repeated experiments. In contrast, the para -hydroxyl COF membranes exhibited a significantly lower selectivity for Sr (II), measuring only 66.4 %. This work provides valuable insights into the design and fabrication of high-performance ions separation membranes and Janus membranes.

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