Realizing small-flake graphene oxide membranes for ultrafast size-dependent organic solvent nanofiltration

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Membranes for organic solvent nanofiltration (OSN) or solvent-resistant nanofiltration (SRNF) offer unprecedented opportunities for highly efficient and cost-competitive solvent recovery in the pharmaceutical industry. Here, we describe small-flake graphene oxide (SFGO) membranes for high-performance OSN applications. Our strategy exploits lateral dimension control to engineer shorter and less tortuous transport pathways for solvent molecules. By using La(3+ )as a cross-linker and spacer for intercalation, the SFGO membrane selective layer was stabilized, and size-dependent ultrafast selective molecular transport was achieved. The methanol permeance was up to 2.9-fold higher than its large-flake GO (LFGO) counterpart, with high selectivity toward three organic dyes. More importantly, the SFGO-La3+ membrane demonstrated robust stability for at least 24 hours under hydrodynamic stresses that are representative of realistic OSN operating conditions. These desirable attributes stem from the La3+ cross-linking, which forms uniquely strong coordination bonds with oxygen-containing functional groups of SFGO. Other cations were found to be ineffective.
Publisher
AMER ASSOC ADVANCEMENT SCIENCE
Issue Date
2020-04
Language
English
Article Type
Article
Citation

SCIENCE ADVANCES, v.6, no.17, pp.eaaz9184

ISSN
2375-2548
DOI
10.1126/sciadv.aaz9184
URI
http://hdl.handle.net/10203/274331
Appears in Collection
CBE-Journal Papers(저널논문)
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