Sealing functional ionic liquids in conjugated microporous polymer membrane by solvent-assisted micropore tightening
Sealing functional ionic liquids in conjugated microporous polymer membrane by solvent-assisted micropore tightening
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DOI：
10.1007/s12274-021-3750-z
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发表时间：
2021-08
期刊：
影响因子：
9.9
通讯作者：
Mengxi Zhang;An-Guo Yu;Xiangyu Wu;Pengpeng Shao;Xin Huang;Dou Ma;Xianghao Han;Jing Xie;Xiao Feng;Boran Wang
中科院分区：
文献类型：
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作者：
Mengxi Zhang;An-Guo Yu;Xiangyu Wu;Pengpeng Shao;Xin Huang;Dou Ma;Xianghao Han;Jing Xie;Xiao Feng;Boran Wang
多孔有机聚合物在分子筛膜分离方面具有广阔的前景。尽管孔中包含功能性离子液体（IL）提供了一种控制其分离性能的简便方法，但分离过程中的离子液体浸出是难以避免的。在此，我们报告了一种通过 6 分钟电聚合将离子液体原位封装到共轭微孔聚合物膜的微孔中的策略，并通过溶剂辅助微孔紧缩 (SAMT) 进一步密封孔的孔径以防止离子液体浸出。通过筛选不同离子液体与气体分子之间的结合能，选择两种离子液体掺入膜中用于 CO2/CH4 和 O2/N2 气体分离。由此产生的分离性能超过了 2008 年 Robeson 上限。值得注意的是，通过简单的高表面张力溶剂处理工艺可以将离子液体锁定在微孔中，以提高其分离稳定性，7 天的连续测试证明了这一点。这种简单且可控的过程不仅能够实现高效稳定的分离性能，而且还为各种应用的多孔固体中限制和密封功能性客体分子提供了有效的策略。
Porous organic polymers hold great promise for molecular sieving membrane separation. Although the inclusion of functional ionic liquid (IL) in the pores offers a facile way to manipulate their separation properties, the IL leaching during the separation process is difficult to avoid. Herein, we report a strategy toin-situencapsulate ILs into the micropores of the conjugated microporous polymer membrane via a 6-min electropolymerization and further seal the aperture of the pores to prevent ILs leaching by solvent-assisted micropore tightening (SAMT). Upon screening the binding energy between different ILs and gas molecules, two ILs were selected to be incorporated into the membrane for CO2/CH4and O2/N2gas separations. The resultant separation performances surpass the 2008 Robeson upper bound. Notably, the ILs can be locked in the micropores by a facile high surface tension solvent treatment process to improve their separation stability, as evidenced by a 7-day continuous test. This simple and controllable process not only enables efficient and steady separation performance but also provides an effective strategy for confining and sealing functional guest molecules in the porous solids for various applications.