期刊
CHEMICAL ENGINEERING SCIENCE
卷 216, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2020.115497
关键词
Polymers of intrinsic microporosity; Nano-sized ZIFs; Mixed matrix membrane; Biogas upgrading; Modified Maxwell model
资金
- National Key Research and Development Program of China [2017YFB0603400]
- National Natural Science Foundation of China [21838008, 21621004]
- State Key Laboratory of Separation Membranes and Membrane Processes and Tianjin Polytechnic University [M1-201501]
- National Key Laboratory of United Laboratory for Chemical Engineering [SKL-ChE-17B01]
Membrane-based separations are of energy-efficient and environmentally benign attributes for biogas energy developments. Membranes from polymers of intrinsic microporosity (PIMs) often suffer from low selectivity. In this study, remarkable enhancements in CO2/CH4 selectivity of PIM-1 membranes are achieved by incorporating nano-sized ZIF-67 (ZIF-S) filler with a larger specific surface area and a better compatibility, thereby fortifying the interactions with PIM-1 matrix and effectively alleviating nonselective interfacial voids. For the resulting PIM-1/ZIF-S membranes, a maximum CO2/CH4 selectivity of 21.1 was acquired with 15 wt% loading of ZIF-S, an increase of 69.40% compared with the pristine PIM-1 membrane, along with an associated CO2 permeability above 2800 Barrer. To elucidate gas transport behaviors within membranes, a modified Maxwell model is developed and the calculation results match well with the experimental data. The strategy of incorporating framework nanofillers into membranes may find promising applications in enhancing the selectivity of highly permeable polymer membranes. (C) 2020 Elsevier Ltd. All rights reserved.
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