Janus Graphene Oxide-Doped, Lamellar Composite Membranes with Strong Aqueous Stability

Chang-Min Kim, Seunghyun Hong, Renyuan Li, In S. Kim, Peng Wang

Research output: Contribution to journalArticlepeer-review

20 Scopus citations

Abstract

Nanostructured graphene oxide (GO) membranes offer outstanding mass transport performances such as ultrahigh water flux and precise molecular sieving and thus have a great potential as a novel filtration platform for energy efficient molecular or ionic separation. However, the structural stability of the GO membranes in aqueous environments remains a challenging problem, which limits its practical application perspective. We, here, report a novel GO composite membrane composed of GO and asymmetrically functionalized Janus GO (JGO) sheets. Single-side functionalized JGO was made by amidation of dodecylamine. Incorporation of JGO in GO film exhibited extraordinary stability in water at broad pH values even under agitation. Moreover, JGO-doped GO composite membrane showed robust integrity in acid or base solutions over months. It exhibits high molecular retention above 95% for uncharged and charged dye molecules, rhodamine B, and brilliant blue G while maintaining water permeability comparable with previously reported GO-based membranes under osmotic pressure. This work significantly expands possibilities for new way to enhance the structural stability in graphene-based or 2D-material membrane and surface-selective functionalization in membrane fabrication for many applications.
Original languageEnglish (US)
Pages (from-to)7252-7259
Number of pages8
JournalACS Sustainable Chemistry & Engineering
Volume7
Issue number7
DOIs
StatePublished - Mar 18 2019

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: This work was supported by the King Abdullah University of Science and Technology (KAUST) center competitive fund (CCF) awarded to Water Desalination and Reuse Center (WDRC) and KAUST Solar Center (KSC). The authors also acknowledge the support from a grant (18IFIP-C071145-06) from Plant Research Program funded by Ministry of Land, Infrastructure and Transport, Republic of Korea.

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