In-situ linker doping as an effective means to tune zeolitic-imidazolate framework-8 (ZIF-8) fillers in mixed-matrix membranes for propylene/propane separation
In-situ linker doping as an effective means to tune zeolitic-imidazolate framework-8 (ZIF-8) fillers in mixed-matrix membranes for propylene/propane separation
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DOI：
10.1016/j.memsci.2019.117689
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发表时间：
2020-02-15
影响因子：
9.5
通讯作者：
Jeong, Hae-Kwon
中科院分区：
文献类型：
--
作者：
Park, Sunghwan;Jeong, Hae-Kwon
咪唑骨架分子筛（ZIF-8）作为分子筛填料在丙烯/丙烷（C3）分离的混合基质膜（MMM）中得到了广泛的研究。含有ZIF-8的MMM的C3分离性能尚未满足商业可行性标准。最近，已经发现在ZIF-8骨架中掺杂或混合连接体在调节ZIF-8的分子筛性质中是有效的。本文中，我们尝试通过掺杂2-乙基咪唑（elm）连接剂来调节MMM中ZIF-8填料的分子筛性能，以改善其C3分离性能。通过使用我们最近报道的聚合物改性使能的原位MOF形成（PMMOF）工艺在聚酰亚胺中原位形成榆树掺杂的ZIF-8填料来制备MMM。由于elm连接体掺杂到ZIF-8填料晶体中，所得MMM的丙烯/丙烷分离因子显著增强。最后，成功制备了基于掺杂连接剂ZIF-8的混合基质中空纤维膜，展示了其可规模化实际应用的潜力。
Zeolitic-imidazole framework-8 (ZIF-8) has been extensively studied as a molecular sieving filler in mixed-matrix membranes (MMMs) for propylene/propane (C3) separation. The C3 separation performance of ZIF-8-containing MMMs has yet to meet the commercial viability criteria. Recently, doping or mixing linkers in ZIF-8 framework has been found effective in tuning the molecular sieving properties of ZIF-8. Herein, we attempted to tune the molecular sieving properties of ZIF-8 fillers in MMMs by doping with 2-ethylimidazole (elm) linkers in order to improve their C3 separation performance. MMMs were prepared by in-situ forming elm-doped ZIF-8 fillers in polyimide using our recently reported polymer-modification-enabled in-situ MOF formation (PMMOF) process. As elm linkers were doped into ZIF-8 filler crystals, the propylene/propane separation factor of the resulting MMMs was dramatically enhanced. Lastly, doped-linker ZIF-8 based mixed-matrix hollow fiber membranes were successfully prepared, demonstrating potential of their scalable practical applications.