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Title: Room-temperature synthesis of ZIF-90 nanocrystals and the derived nano-composite membranes for hydrogen separation
Authors: Yang, T.
Chung, T.-S. 
Issue Date: 2013
Citation: Yang, T., Chung, T.-S. (2013). Room-temperature synthesis of ZIF-90 nanocrystals and the derived nano-composite membranes for hydrogen separation. Journal of Materials Chemistry A 1 (19) : 6081-6090. ScholarBank@NUS Repository.
Abstract: Nanocrystals of ZIF-90 have been synthesized at room temperature through a novel procedure and incorporated into PBI-based nano-composite membranes for hydrogen purification. The physical and chemical structures of the ZIF-90 nanoparticles have been examined via multiple advanced instrumental analyses including DLS, XRD, FESEM, NMR and FTIR. The nanocrystals show identical morphology, crystallinity and chemical structure but a significantly reduced particle size (around 100 nm) when compared with the ZIF-90 particles in previous studies. The derived ZIF-90-PBI nano-composite membranes exhibit homogeneous particle dispersion and fine particle-polymer adhesion, as well as excellent hydrogen purification performance at various testing conditions. The 45/55 (w/w) ZIF-90-PBI membrane with the highest ZIF-90 volume loading of up to 50.9 vol% possesses the best ideal H2-CO2 separation performance with a moderate H2 permeability of 24.5 Barrer and a high H2-CO2 selectivity of 25.0 in pure gas permeation tests at 35 °C. The membrane also shows promoted gas separation performance during mixed gas tests at 180 °C with an H2 permeability of 226.9 Barrer and an H2-CO2 separation factor of 13.3 that surpasses the latest Robeson upper bound for H2-CO2 separation. This work not only expands the field of nano-composite membrane fabrication, but also provides prospects for interdisciplinary research combining nano-science and chemical engineering for clean energy development. © The Royal Society of Chemistry 2013.
Source Title: Journal of Materials Chemistry A
ISSN: 20507488
DOI: 10.1039/c3ta10928c
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