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Construction of PDMS@ZIF-8 composite membrane on PVDF hollow fiber inner surface for ultrafast ethanol/water separation.
- Source :
-
Journal of Membrane Science . Jun2024, Vol. 704, pN.PAG-N.PAG. 1p. - Publication Year :
- 2024
-
Abstract
- Construction of ultra-thin and defect-free separation membrane on inner surface of hollow fiber supports is significant but challenging for molecular separation. In this study, the highly permeable PDMS@ZIF-8/PVDF composite membranes were successfully fabricated upon the inner-surface of polyvinylidene fluoride (PVDF) hollow fiber membrane for pervaporation (PV) ethanol/water separation. The efficient preparation of hierarchical PDMS@ZIF-8/PVDF composite membranes benefited from the precise regulation of ZIF-8 layer through interfacial synthesis and sequential coating of PDMS matrix. The thickness of the PDMS layer was only 16 ± 2 nm, which admirably eliminated the non-selective defects in ZIF-8 layer. Owning to the optimal combination of MOF layer and ultra-thin polymer layer, the as-prepared membrane exhibited the excellent ethanol flux of 1.34 kg m−2 h−1 with an ethanol concentration in permeate of 31.3 wt% for separating 5 wt% ethanol aqueous solution at 40 °C. The separation performance of the resultant membrane was superior to that of the other ethanol selective PV membranes. These findings herein provided a new way for preparing high-performance hollow fiber composite membranes for PV separation. [Display omitted] • Highly permeable PDMS@ZIF-8 hollow fiber composite membranes were prepared. • ZIF-8 layer was prepared on inner surface of hollow fiber by interfacial synthesis. • Ultra-thin PDMS layer (∼16 nm) successfully repaired the defects of ZIF-8 layer. • The strategy avoided the fillers agglomeration in conventional composite membranes. • The membrane readily overcame the trade-off effect in permeability and selectivity. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03767388
- Volume :
- 704
- Database :
- Academic Search Index
- Journal :
- Journal of Membrane Science
- Publication Type :
- Academic Journal
- Accession number :
- 177564020
- Full Text :
- https://doi.org/10.1016/j.memsci.2024.122889