Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 1, Issue 19, Pages 6081-6090Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3ta10928c
Keywords
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Funding
- Singapore National Research Foundation (NRF) [R-279-000-261-281, R-279-000-311-281]
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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 H-2-CO2 separation performance with a moderate H-2 permeability of 24.5 Barrer and a high H-2-CO2 selectivity of 25.0 in pure gas permeation tests at 35 degrees C. The membrane also shows promoted gas separation performance during mixed gas tests at 180 degrees C with an H-2 permeability of 226.9 Barrer and an H-2-CO2 separation factor of 13.3 that surpasses the latest Robeson upper bound for H-2-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.
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