Ion beam engineered graphene oxide membranes for mono-/divalent metal ions separation

Yibin Wei, Zeljko Pastuovic, Chao Shen, Timothy Murphy, Damian B. Gore

Research output: Contribution to journalArticle

Abstract

Graphene oxide (GO) membranes with precisely controlled nanopores are promising for selectively ionic separation. Here, an ion beam was used to efficiently and simply post-modify GO membranes, creating nanopores in a controllable manner. We compared the influence of GO membrane thickness and ion fluence on the GO structure and the consequent mono-/di-valent metal ion separation performance. Experimental results indicate all GO membranes exhibited improved K+ selectivity with respect to other ions after ion beam irradiation. Moreover, the K+ ion permeability of the optimal membranes is up to 1.4 × 10−3 mol m−2 h−1 and the membrane shows extremely high K+ separation factor to di-valent ions. Remarkably, this method could be used as an in-situ post-treatment for pre-assembled GO membranes. We believe that this strategy offers novel insights into fabricating nanoporous membranes constructed by two-dimensional nanomaterials for a variety of fields including energy, desalination and biomedical applications.
Original languageEnglish
Pages (from-to)598-606
Number of pages9
JournalCarbon
Volume158
DOIs
Publication statusPublished - Mar 2020

Keywords

  • Graphene oxide
  • Membrane
  • Ion beam
  • Ion sieving
  • Defect

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