Synthesis of Ultrathin Zeolitic Imidazolate Framework ZIF‑8 Membranes on Polymer Hollow Fibers Using a Polymer Modification Strategy for Propylene/Propane Separation
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© 2019 American Chemical Society. Polycrystalline zeolitic imidazolate framework ZIF-8 membranes have shown great potential for energy-efficient propylene/propane separation. Their large-scale applications are, however, hampered by the lack of facile and cost-effective processing technologies for ultrathin ZIF-8 membranes on scalable substrates. Here, we report facile preparation of ultrathin ZIF-8 membranes on the bore side of Matrimid hollow fibers based on a polymer modification strategy. Site-selective nature of the method enables a positional control over locations (i.e., bore or shell side) of active ZIF-8 layers on the hollow fibers. The ZIF-8 membranes grown on the bore side of Matrimid hollow fibers with polydimethylsiloxane coating displayed an average propylene permeance and a separation factor of â152 × 10-10 mol·m-2·Pa-1·s-1 and â55, respectively. Optimization of ZIF-8 seeding step resulted in an improvement in propylene permeance (â369 × 10-10 mol·m-2·Pa-1·s-1) while maintaining relatively high separation factor (â40).
author list (cited authors)
Hamid, M., Park, S., Kim, J. S., Lee, Y. M., & Jeong, H.