Nanoscale architecture of graphene oxide membranes for improving dehumidification performance
https://doi.org/10.17586/2220-8054-2018-9-5-614-621
Abstract
Thin composite graphene oxide (GO) membranes prepared from the mixture of GO nanoflakes and nanoribbons are proposed to enhance membrane stability at elevated pressure gradients. It is shown that addition of 5 – 15 % of GO nanoribbons to medium flake graphene oxide during deposition allows up to a 60 % increase in the porosity of GO membranes. The membranes illustrate strong barrier properties to permanent gases with a permeance below 0.01 m3 /(m2 ·bar·h), while revealing high permeance to water vapor over 50 m3 /(m2 ·bar·h). This results in H2O/N2 selectivity up to 12500 at water vapor fluxes over 1 m3 /(m2 ·h) at relative humidity of feed stream of 90 %. Despite ∼ 10 % loss of membrane performance with addition of nanoribbons, the membranes reveal an improved stability to pressure gradients. Irreversible permeance loss of composite membranes does not exceed 10 % as compared to ∼ 35 % performance loss for pure medium flake graphene oxide (MFGO) after long term exposure to 0.1 MPa pressure difference. An improved stability is invoked for the prevention of the irreversible conglomeration of GO flakes and appearance of permanent channels for water transport along the edges of nanoribbons.
Keywords
graphene oxide flakes,
nanoribbons,
anodic alumina,
pressure stability,
dehumidification,
water transport
Supporting agencies: The work is supported by the Ministry of education and science of the Russian Federation within a Federal Targeted Programme for “Research and Development in Priority Areas of Development of the Russian Scientific and Technological Complex for 2014–2020” (Agreement No. 14.604.21.0177, unique Project Identification RFMEFI60417X0177).
About the Authors
E. A. Chernova
Lomonosov Moscow State University
Russian Federation
Russian Federation
Leninskiye Gory, Moscow, 119991
D. I. Petukhov
Lomonosov Moscow State University
Russian Federation
Russian Federation
Leninskiye Gory, Moscow, 119991
O. O. Kapitanova
Lomonosov Moscow State University
Russian Federation
Russian Federation
Leninskiye Gory, Moscow, 119991
O. V. Boytsova
Lomonosov Moscow State University; Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences
Russian Federation
Russian Federation
Leninskiye Gory, Moscow, 119991; Leninsky prospect, 31, Moscow, 119991
A. V. Lukashin
Lomonosov Moscow State University
Russian Federation
Russian Federation
Leninskiye Gory, Moscow, 119991
A. A. Eliseev
Lomonosov Moscow State University
Russian Federation
Russian Federation
Leninskiye Gory, Moscow, 119991
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Review
For citations:
Chernova E.A., Petukhov D.I., Kapitanova O.O., Boytsova O.V., Lukashin A.V., Eliseev A.A. Nanoscale architecture of graphene oxide membranes for improving dehumidification performance. Nanosystems: Physics, Chemistry, Mathematics. 2018;9(5):614-621. https://doi.org/10.17586/2220-8054-2018-9-5-614-621
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