Ultrathin graphene-based membrane with precise molecular sieving and ultrafast solvent permeation

Q Yang, Yang Su, C Chi, C. T. Cherian, K Huang, V. G. Kravets, F. C. Wang, Jason Zhang, Andrew Pratt, A. N. Grigorenko, F Guinea, A. K. Geim, R. R. Nair

Research output: Contribution to journalArticlepeer-review

Abstract

Graphene oxide (GO) membranes continue to attract intense interest due to their unique molecular sieving properties combined with fast permeation. However, their use is limited to aqueous solutions because GO membranes appear impermeable to organic solvents, a phenomenon not yet fully understood. Here, we report efficient and fast filtration of organic solutions through GO laminates containing smooth two-dimensional (2D) capillaries made from large (10-20 μm) flakes. Without modification of sieving characteristics, these membranes can be made exceptionally thin, down to â 1/410 nm, which translates into fast water and organic solvent permeation. We attribute organic solvent permeation and sieving properties to randomly distributed pinholes interconnected by short graphene channels with a width of 1 nm. With increasing membrane thickness, organic solvent permeation rates decay exponentially but water continues to permeate quickly, in agreement with previous reports. The potential of ultrathin GO laminates for organic solvent nanofiltration is demonstrated by showing >99.9% rejection of small molecular weight organic dyes dissolved in methanol. Our work significantly expands possibilities for the use of GO membranes in purification and filtration technologies.

Original languageEnglish
Pages (from-to)1198-1202
Number of pages5
JournalNature Materials
Volume16
Issue number12
DOIs
Publication statusPublished - 13 Nov 2017

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© 2017 Macmillan Publishers Limited. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details

Keywords

  • Graphene
  • Two-dimensional materials
  • Chemical engineering
  • X-ray photoelectron spectroscopy

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