Thermally annealed polyimide-based mixed matrix membrane containing ZIF-67 decorated porous graphene oxide nanosheets with enhanced propylene/propane selectivity
- Authors
- Moghadam, Farhad; Lee, Tae Hoon; Park, Inho; Park, Ho Bum
- Issue Date
- May-2020
- Publisher
- ELSEVIER
- Keywords
- Mixed matrix membranes; Plasticization; Polyimides; Propylene/propane separation; Thermal annealing
- Citation
- JOURNAL OF MEMBRANE SCIENCE, v.603, pp.1 - 12
- Indexed
- SCIE
SCOPUS
- Journal Title
- JOURNAL OF MEMBRANE SCIENCE
- Volume
- 603
- Start Page
- 1
- End Page
- 12
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/1939
- DOI
- 10.1016/j.memsci.2020.118019
- ISSN
- 0376-7388
- Abstract
- This work presents a new type of thermally annealed 6FDA-DAM-based mixed matrix membranes (MMMs) containing two-dimensional (2D) ZIF-67-decorated porous graphene oxide nanosheets (ZPGO67) with promising C3H6/C3H8 transport properties. Different characterization techniques, including XRD, DSC, FTIR, and fluorescence spectroscopy, were used to elucidate possible changes in physicochemical properties and structure of MMMs through thermal annealing. C3H6/C3H8 sorption isotherms for pristine 6FDA-DAM and MMM containing ZPGO67 were also measured at different temperatures. Single-gas permeation data indicated that embedding a 20 wt% ZPGO67 filler in the polyimide matrix increased C3H6 permeability from 19.5 Barrer to 58.8 Barrer at 2 bar and 35 °C. The corresponding thermally annealed MMMs showed not only high C3H6/C3H8 permselectivity also excellent resistance to plasticization. For instance, MMM thermally annealed at 400 °C presented C3H6/C3H8 permselectivity of 17.8, at 2 bar and 35 °C, considerably higher than that obtained for the non-annealed MMM. This membrane also showed stable C3H6 permeability of 18.2 Barrer and C3H6/C3H8 permselectivity of 11.3 at 5 bar and 50 °C for 24 h. The high C3H6/C3H8 permselectivity and good anti-plasticization behavior of thermally annealed membranes were mainly attributed to the formation of charge-transfer complexes (CTCs), as evidenced by fluorescence spectroscopy analysis and Tg measurement.
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