期刊
JOURNAL OF MEMBRANE SCIENCE
卷 559, 期 -, 页码 28-34出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2018.04.041
关键词
Zeolitic-imidazolate frameworks; Olefin/paraffin separation; Hollow fibers; Membranes; Gas separation
资金
- National Science Foundation [CBET-1510530, DBI-0116835]
- Qatar National Research Fund (Qatar Foundation) [8-001-2-001]
Polymer hollow fibers have great potential as cost-effective scalable substrates for the practical applications of highly propylene-selective ZIF-8 membranes. We report ultrathin ZIF-8 membranes supported on porous Matrimid (R) polymer hollow fibers via microwave-assisted seeding and microfluidic secondary growth. Denselypacked ZIF-8 seed layers were rapidly prepared on polymeric hollow fibers under microwave heating. The seed layers were then secondarily grown into well-intergrown ZIF-8 membranes under the continuous flow of the growth solution. The effects of synthesis parameters on the microstructures of ZIF-8 seed crystals were systematically studied. The resulting ZIF-8 membranes were characterized with XRD and SEM, showing well-intergrown ZIF-8 films formed on the bore of hollow fibers. The unique nature of the current technique enables facile formation of ultrathin ZIF-8 membranes on either the bore or shell side of hollow fibers with a thickness of similar to 800 nm. Propylene/propane binary gas permeation measurements showed an average separation factor of similar to 46 and propylene permeance of similar to 55 GPU.
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