Scalable fabrication of graphene-based laminate membranes for liquid and gas separations by crosslinking-induced gelation and doctor-blade casting
- Yang, Euntae; Karahan, H. Enis; Goh, Kunli; Chuah, Chong Yang; Wang, Rong; Bae, Tae-Hyun
- Issue Date
- PERGAMON-ELSEVIER SCIENCE LTD
- Membrane separation; Graphene oxide; Gelation; Metal ions; Polyethylene oxide; Polyethyleneimine
- CARBON, v.155, pp.129 - 137
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- Graphene-based laminate membranes have recently demonstrated unique advantages over the traditional separation membranes made of polymers or ceramics. For both gas and liquid separations, various designs of crosslinker-stabilized graphene oxide (GO) membranes have been reported. However, the preparation methods used for those are poorly scalable for industrial applications. Herein, we report the fabrication of large-area (1333 cm(2)) GO-based membranes via doctor-blade casting of gel-like slurries prepared by incorporating calcium ions (Ca2+), ferric ions (Fe3+), polyethylene oxide (PEO), or polyethyleneimine (PEI) as crosslinkers. We found that all crosslinkers tested are suitable for the gelation of dilute GO dispersions (1-5mg/mL) for doctor-blade casting. Besides, all crosslinked-GO membranes demonstrated outstanding stability under sonication compared to a GO-only membrane prepared via vacuum-assisted filtration. In aqueous nanofiltration tests, Fe3+-crosslinked GO membranes achieved virtually complete rejection of different organic dyes. PEO-crosslinked GO membranes, on the other hand, exhibited an outstanding performance for the separation of carbon dioxide (CO2) and nitrogen (N-2) gases with a CO2/N-2 selectivity of 52. Given the scaleup potential of doctor-blade casting and the practicality of crosslinking-based gelation approach, the proposed approach is promising to increase the industrial relevance of GO-based laminate membranes. (C) 2019 Elsevier Ltd. All rights reserved.
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- 해양과학대학 > Department of Marine Environmental Engineering > Journal Articles
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