Zeolitic Imidazolate Framework Membranes Supported on Macroporous Carbon Hollow Fibers by Fluidic Processing Techniques
Zeolitic Imidazolate Framework Membranes Supported on Macroporous Carbon Hollow Fibers by Fluidic Processing Techniques
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DOI：
10.1002/admi.201700080
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发表时间：
2017-06-23
影响因子：
5.4
通讯作者：
Nair, Sankar
中科院分区：
文献类型：
--
作者：
Eum, Kiwon;Ma, Chen;Nair, Sankar
本研究解决了金属-有机框架（特别是沸石咪唑酯框架（ZIF））中空纤维膜的可推广制造的挑战，所述中空纤维膜可以允许更广泛的分离，包括烃（石化）以及有机物/水（生物精炼）分离。我们报告了一种新的策略，将流体膜处理与化学惰性碳中空纤维相结合，以产生坚固的ZIF膜。通过对交联聚合物中空纤维的热解转化，成功制备了大孔碳中空纤维。该步骤允许使用宽范围的相对侵蚀性的流体处理溶剂和条件。使用这些惰性纤维支持，ZIF-90膜的制造被证明和他们的丁烷异构体分离的第一次调查。此外，碳中空纤维上的ZIF膜可用于水/有机混合物的分离，而没有ZIF/聚合物中空纤维膜中所见的纤维溶胀或溶解的问题。ZIF-8/炭膜对糠醛和乙醇的脱水表现出持续数天的稳定操作，具有高的水渗透率和分离因子。在所有情况下，ZIF膜的制备无需任何接种、载体改性或合成后程序，从而简化了制造工艺并增加了大规模膜制造的潜力。
This study addresses the challenge of generalizable fabrication of metal-organic framework (particularly zeolitic imidazolate frameworks (ZIF)) hollow fiber membranes that can allow a broader range of separations including hydrocarbon (petrochemical) as well as organics/water (biorefining) separations. We report a novel strategy that combines fluidic membrane processing with chemically inert carbon hollow fibers to produce robust ZIF membranes. Macroporous carbon hollow fibers are successfully fabricated by pyrolytic conversion of cross-linked polymer hollow fibers. This step allows the use of a wide range of relatively aggressive fluidic processing solvents and conditions. Using these inert fiber supports, the fabrication of ZIF-90 membranes is demonstrated and their butane isomer separations are investigated for the first time. Furthermore, ZIF membranes on carbon hollow fibers can be used in the separation of water/organic mixtures without the issue of fiber swelling or dissolution as seen in ZIF/polymer hollow fiber membranes. ZIF-8/carbon membranes show stable operation spanning several days for dehydration of furfural and ethanol, with high water permeances and separation factors. In all cases, the ZIF membranes are prepared without any seeding, support modification, or postsynthesis procedures, thereby simplifying the fabrication process and increasing the potential for larger-scale membrane fabrication.