Cited by 68Membrane Separation and Gas TransportNanopore and Nanochannel Transport StudiesGraphene research and applications

Gas Separation in Nanoporous Graphene from First Principle Calculations

Ambrosetti, Alberto, Silvestrelli, Pier Luigi·2014·The Journal of Physical Chemistry C

Abstract

Thanks to its single atom thickness and its mechanical strength, nanoporous graphene is currently being regarded as a promising candidate for efficient and reliable gas separation applications. Clearly, the accurate energetic characterization of the penetration processes involving relevant gas-phase molecules is a fundamental prerequisite for any possible application. Here we evaluate permeation barriers and adsorption energies of the H 2 O, CH 4, CO, CO 2, O 2, and H 2 molecules and of the Ar atom on two types of hydrogen saturated pores by means of ab initio simulations, based on the density functional theory (DFT), able to include dispersion corrections too. We find that, although the qualitative trend followed by the values of the permeation barriers of the considered molecules is independent of the adopted DFT functional, at a quantitative level the results are noticeably affected by the dispersion corrections and the chosen exchange contribution characterizing the different functionals, as well as by the allowed graphene sheet distortions. Interestingly, we observe that, due to the occurrence of nontrivial H-bond interactions with the pore-saturating H atoms, the permeation barrier of water remains low even considering a small-size pore. The barrier is further diminished when considering the interaction with a second water molecule on the opposite side of the pore. These observations, combined with the relatively strong binding of the water molecule with the defected surface, suggests that porous graphene could also represent a promising membrane for water filtration.

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Crossref · 10.1021/jp504914u

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Authors
Ambrosetti, A., & Silvestrelli, P. L.
Affiliations
University of Padua (IT)
Corresponding author
Ambrosetti, Alberto
Venue
The Journal of Physical Chemistry C
Published
2014-08-13
Volume
118
Issue
33
Pages
19172-19179
ISSN
  • 1932-7447 (ISSN-L)
  • 1932-7455
OpenAlex
W2073625297
Cited by
68
References
61
Citations by year
2026: 1 · 2025: 3 · 2024: 1 · 2023: 4 · 2022: 5 · 2021: 7 · 2020: 4 · 2019: 9 · 2018: 5 · 2017: 9 · 2016: 10 · 2015: 8 · 2014: 2
FWCI
11.28
Type
journal article
Language
en
Open access
closed
Locations
  • The Journal of Physical Chemistry C (publishedVersion)
  • Padua Research Archive (University of Padova) (submittedVersion)
Funders
Ministero dell'Istruzione, dell'Universit? e della Ricerca
Topics
  • Physical Sciences › Engineering › Mechanical Engineering › Membrane Separation and Gas Transport
  • Physical Sciences › Engineering › Biomedical Engineering › Nanopore and Nanochannel Transport Studies
  • Physical Sciences › Materials Science › Materials Chemistry › Graphene research and applications
Keywords
nanoporous graphene, gas separation, adsorption energy, water permeation, water filtration membranes, dispersion correction, exchange-correlation functionals, hydrogen bonding, methane, carbon dioxide, oxygen, hydrogen, argon

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