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

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journal contribution
posted on 15.01.2020, 15:08 authored by Q Yang, Yang Su, C Chi, CT Cherian, K Huang, VG Kravets, FC Wang, JC Zhang, A Pratt, AN Grigorenko, F Guinea, AK Geim, RR Nair
© 2017 Macmillan Publishers Limited, part of Springer Nature. All rights reserved. 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.

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

Nature Materials

Volume

16

Issue

12

Pages

1198 - 1202

Publisher

Springer Science and Business Media LLC

Version

AM (Accepted Manuscript)

Rights holder

© Macmillan

Publisher statement

This is a post-peer-review, pre-copyedit version of an article published in Nature Materials. The definitive publisher-authenticated version YANG, Q. ... et al., Ultrathin graphene-based membrane with precise molecular sieving and ultrafast solvent permeation. Nature Materials, 16(12), pp. 1198 - 1202. is available online at: https://doi.org/10.1038/nmat5025

Acceptance date

05/10/2017

Publication date

2017-11-13

Copyright date

2017

ISSN

1476-1122

eISSN

1476-4660

Language

en

Location

England

Depositor

Dr Yang Su Deposit date: 14 January 2020