Incorporating multivalent metal cations into graphene oxide: Towards highly-aqueous-stable free-standing membrane via vacuum filtration with polymeric filters

Antai Li, Kai Han*, Yonghua Zhou, Hongqi Ye, Gonggang Liu, Harold H Kung

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

Aqueous stability is an essential prerequisite for solution-based applications of graphene oxide (GO) membranes. In this work, we rationally explore the possibility of incorporating ppm-level multivalent metal cations to enhance the aqueous stability of GO membranes via vacuum filtration with low-cost polymer filters and focus on the effect of incorporation approach. Based on two basic ideas of introducing metal cations into GO or polymer filters during membrane preparing and processing, four metal cations, including Al3+, Cr3+, Mg2+, Cu2+, were incorporated into GO membrane prepared using nitrocellulose filter by pre-, post-, and filter-incorporation approaches. It is found that the neat GO membranes disintegrate in water within 4 h. When using pre-incorporation approach, the studied four metal cations showed very similar results, crack and swelling appear for GO membranes in 24 h in water. As for the post-and filter-incorporation approaches, the GO membranes showed superior aqueous stability for at least one month. The corresponding models and mechanisms were further proposed to understand the effect of metal cations on filtration process and GO membrane aqueous stability. The results demonstrate the successful attempts of incorporating ppm-level multivalent metal cations into GO to achieve highly-aqueous-stable GO membranes via vacuum filtration with low-cost polymeric filters.

Original languageEnglish (US)
Pages (from-to)139-146
Number of pages8
JournalMaterials Today Communications
Volume11
DOIs
StatePublished - Jun 1 2017

Keywords

  • Aqueous stability
  • Graphene oxide membrane
  • Multivalent metal cations
  • Polymeric filters
  • Vacuum filtration

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanics of Materials
  • Materials Chemistry

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