Gas permeation and separation properties of large-sheet stacked graphene oxide membranes

Ibrahim, Amr F. M.; Lin, Youzuo

doi:10.1016/j.memsci.2017.12.081

Cited by 71 publications

(61 citation statements)

References 18 publications

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“…We note that neon has a significantly lower permeation, [48,49]). Similar behaviour has been observed in carbon [5,57] and silica membranes 1 [49,58], where for example, hydrogen has much higher permeance than helium or neon. This 2 behaviour may be explained by the higher relative adsorption of hydrogen compared to neon, 3 which has been measured in porous carbons [59,60] which are comparable to nanographite.…”

supporting

confidence: 70%

“…where sieving is dominated by the interlayer spacing between sheets, whereby smaller molecules can pass between stacked sheets but larger molecules cannot [5,16,47] and thus the larger gases have a much lower permeance. Ibrahim et al [57] recently proposed a twopathway transport model in graphene oxide, whereby there are inter-sheet pathways composed of nanoscale wrinkles between sheets, and inner-sheet pathways consisting of structural defects in the sheets.…”

Section: Discussion Of Separation Behaviourmentioning

confidence: 99%

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Micromachined nanocrystalline graphite membranes for gas separation

Fishlock

Bhattacharya

et al. 2018

Carbon

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Carbon nanoporous membranes show promising performance for the passive separation and sieving of different gases, for example for helium and hydrogen separation. In this paper, nanocrystalline graphite (or nanographite) has been evaluated as a membrane material for molecular sieving of helium and hydrogen from larger gas constituents. Nanographite of 350 nm thickness was prepared using plasma-enhanced chemical vapour deposition onto fused silica substrates, from which membranes were microfabricated using deep wet etching. Permeability of hydrogen and helium were 1.79 ×10-16 and 1.40×10-16 mol•m•m-2 •s-1 •Pa-1 at 150 °C respectively, and measured separation was 48 for He/Ne, >135 for H 2 /CO 2 and >1000 for H 2 /O 2. The gas separation properties of the nanographite membranes were tested in the temperature range of 25 to 150 °C, and the permeation measurements show nanographite to be highly selective of helium and hydrogen over all larger gas molecules, including neon.

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supporting

confidence: 70%

Section: Discussion Of Separation Behaviourmentioning

confidence: 99%

Micromachined nanocrystalline graphite membranes for gas separation

Fishlock

Bhattacharya

et al. 2018

Carbon

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“…The membranes have a tendency to display Knudsen diffusion with the permeance of permanent gases lowering proportional to square root from molecular weight ( Table 2). Such transport mechanism corresponds to gaseous diffusion through interflake edges [22]. The permeance of membranes generally increases with content of GO nanoribbons which obviously corresponds to additional pathways created by introduction of ribbons to the layered structure.…”

Section: Fig 1 Schematic Illustration Of the Structure Of Mfgo-cntgmentioning

confidence: 98%

Nanoscale architecture of graphene oxide membranes for improving dehumidification performance

Chernova¹,

Петухов²,

Kapitanova³

et al. 2018

Nanosystems: Phys. Chem. Math.

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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 m 3 /(m 2 •bar•h), while revealing high permeance to water vapor over 50 m 3 /(m 2 •bar•h). This results in H 2 O/N 2 selectivity up to 12500 at water vapor fluxes over 1 m 3 /(m 2 •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.

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“…An efficient spray-evaporation method was explored in [11] to optimize performance of GO membranes. The very interesting experimental results related to the transport of gases such as CH 4 , N 2 , CO 2 , H 2 and He through GO membranes are given in [12]. These results can be used in a study of the separation of gas mixtures and in a development of new models for mass transfer through GO membranes.…”

Section: Introductionmentioning

confidence: 97%

“…GO membranes contain stacked GO sheets as well as vacancy defects and functional groups distributed in carbon lattice, these membranes can be cheaply produced by oxidation and exfoliation of graphite [2]. The problems related to preparation of GO membranes and mass transfer in them were discussed in particular in [10][11][12]. In [10] it was shown that self-standing GO membranes demonstrate outstanding performance for hydrogen separations, including mixtures of H 2 /CO 2 and H 2 /hydrocarbons.…”

Section: Introductionmentioning

confidence: 99%

Mass Transfer Through Graphene-Based Membranes

et al. 2020

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The problems related to the transport of gases through nanoporous graphene (NG) and graphene oxide (GO) membranes are considered. The influence of surface processes on the transport of gas molecules through the aforementioned membranes is studied theoretically. The obtained regularities allow finding the dependence of the flux of the gas molecules passing through the membrane on the kinetic parameters which describe the interaction of the gas molecules with the graphene sheets. This allows to take into account the influence of external fields (e.g., resonance radiation), affecting the aforementioned kinetic parameters, on the transport of gas molecules through the membranes. The proposed approach makes it possible to explain some experimental results related to mass transfer in the GO membranes. The possibility of the management of mass transfer through the NG and GO membranes using resonance radiation is discussed.

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Gas permeation and separation properties of large-sheet stacked graphene oxide membranes

Cited by 71 publications

References 18 publications

Micromachined nanocrystalline graphite membranes for gas separation

Micromachined nanocrystalline graphite membranes for gas separation

Nanoscale architecture of graphene oxide membranes for improving dehumidification performance

Mass Transfer Through Graphene-Based Membranes

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