Journal
SEPARATION AND PURIFICATION TECHNOLOGY
Volume 206, Issue -, Pages 80-89Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.seppur.2018.05.056
Keywords
Zeolitic imidazolate framework; Hydrophobic modification; Mixed matrix membrane; Pervaporation; Ethanol recovery
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Funding
- Wuhan ZHSB Environmental Technology Co. Ltd. [013-0231013406, 013-0231013416]
- Natural Science Foundation of Hubei Scientific Committee [2016CFA001]
- Open Research Fund Program of Collaborative Innovation Center of Membrane Separation and Water Treatment of Zhejiang Province [2016YB03]
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In this study, dodecylamine-modified zeolitic imidazolate framework-90 (DLA-ZIF-90) particles with enhanced surface hydrophobicity are synthesized and incorporated into the polydimethylsiloxane (PDMS) matrix to fabricate novel PDMS/DLA-ZIF-90 mixed matrix membranes (MMMs) for ethanol recovery via pervaporation. The successful modification of ZIF-90 particles is investigated via various characterization techniques. The morphology and physicochemical properties of the PDMS/DLA-ZIF-90 MMMs are studied and characterized. Compared to the PDMS MMM with unmodified ZIF-90, PDMS/DLA-ZIF-90 MMM exhibits enhanced morphology homogeneity and separation performance, contributed by the flexible inner channels of ZIF-90-DLA particles with enhanced adsorption selectivity, as well as the improved affinity between ZIF-90-DLA particles and PDMS matrix. The MMM with 2.5 wt% DLA-ZIF-90 loading shows the best performance with the optimal flux of 99.5 g m(-2) h(-1) and corresponding separation factor of 15.1 at 60 degrees C. The effect of operation temperature is also studied. The performance benchmarking shows that PDMS/DLA-ZIF-90 MMM exhibits superior pervaporation performance to most other PDMS-based membranes, and may therefore shed valuable insights to the development of high-performance ZIF-based MMMs for organic recovery.
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