Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 466, Issue -, Pages 92-102Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.memsci.2014.04.024
Keywords
Mixed matrix membrane; Metal organic framework; Gas separation; Post-treatment
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Funding
- National High Technology Research and Development Program of China [2012AA03A611]
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this work a series of mixed matrix membranes (MMMs) containing metal organic frameworks (MOFs) were fabricated to investigate the influence of post-treatment on their gas separation properties. It was revealed that gas permeabilities increased considerably as treatment temperature increased from 150 degrees C to 180 degrees C and remained almost unchanged after 200 degrees C; gas permeability of MMMs from 200 degrees C treatment was about 3 times higher when compared with MMMs treated at 150 degrees C. From results of physical characterization including TGA, XRD, SEM, ATR-FTIR and nitrogen absorption it was inferred that higher temperature treatment induced gas permeability increase should be mainly attributed to more effective removal of residual solvent in micro-pores of MOFs; and gas permeation properties of MMMs with different treatment durations from 24 h to 96 h further confirmed our conclusion. This heat treatment induced permeability increase phenomenon was further verified by varying the polymer and MOF combinations. At the end Cu-3(BTC)(2)/ODPA-TMPDA MMMs with different MOF loadings were prepared and the one with best performance appeared at 40 wft loading: a dramatic increase of CO2 permeability from 47.7 Barrer to 260.7 Barrer with almost unchanged CO2/CH4 selectivity from 29.26 to 27.75. (C) 2014 Elsevier B.V. All rights reserved.
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