Tunable water desalination across graphene oxide framework membranes

Adrien Nicolaï, Bobby G. Sumpter, Vincent Meunier

Research output: Contribution to journalArticlepeer-review

204 Scopus citations

Abstract

The performance of graphene oxide framework (GOF) membranes for water desalination is assessed using classical molecular dynamics (MD) simulations. The coupling between water permeability and salt rejection of GOF membranes is studied as a function of linker concentration n, thickness h and applied pressure ΔP. The simulations reveal that water permeability in GOF-(n,h) membranes can be tuned from ∼5 (n = 32 and h = 6.5 nm) to 400 L cm -2 day-1 MPa-1 (n = 64 and h = 2.5 nm) and follows a Cnhn law. For a given pore size (n = 16 or 32), water permeability of GOF membranes increases when the pore spacing decreases, whereas for a given pore spacing (n = 32 or 64), water permeability increases by up to two orders of magnitude when the pore size increases. Furthermore, for linker concentrations n ≤ 32, the high water permeability corresponds to a 100% salt rejection, elevating this type of GOF membrane as an ideal candidate for water desalination. Compared to experimental performance of reverse osmosis membranes, our calculations suggest that under the same conditions of applied pressure and characteristics of membranes (ΔP ∼ 10 MPa and h ∼ 100 nm), one can expect a perfect salt rejection coupled to a water permeability two orders of magnitude higher than existing technologies, i.e., from a few cL cm-2 day-1 MPa-1 to a few L cm-2 day-1 MPa -1.

Original languageEnglish (US)
Pages (from-to)8646-8654
Number of pages9
JournalPhysical Chemistry Chemical Physics
Volume16
Issue number18
DOIs
StatePublished - May 14 2014

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry

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