Nanoscale architecture of graphene oxide membranes for improving dehumidification performance

Chernova, É. A.; Петухов, Д. И.; Kapitanova, Olesya O.; Boytsova, O. V.; Lukashin, A. V.; Eliseev, A. A.

doi:10.17586/2220-8054-2018-9-5-614-621

Cited by 6 publications

(3 citation statements)

References 21 publications

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“…It should be noted that the amount of both spacers should definitely strongly influence the membrane’s structure and performance. The role of the amount of nanoribbons on the permeance of the membranes was reported earlier in Ref [ 39 ], revealing a strong enhancement in parasitic permanent gas flow when increasing the amount of nanoribbons. However, no permeance stabilizing effects were exposed in the work.…”

Section: Resultssupporting

confidence: 59%

Oxidized Carbon-Based Spacers for Pressure-Resistant Graphene Oxide Membranes

et al. 2022

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In this study, we report the influence of carbon-based spacer-oxidized derivatives of fullerenes (fullerenols) C60(OH)26–32 and graphene oxide nanoribbons on the performance and pressure stability of graphene-oxide-based composite membranes. The impact of the intercalant shape and composition on the permeance of the selective layers for water vapors has been studied under pressure gradients. It is shown that the insertion of ball-shaped fullerenols between graphene oxide nanoflakes allows a suppression in irreversible permeance loss to 2–4.5% and reversible permeance loss to <25% (at 0.1 MPa), while retaining large H2O/N2 selectivities of up to ~30,000. The demonstrated approach opens avenues for the highly effective stabilization of GO membranes at elevated pressures for industrial-scale dehumidification.

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Section: Resultssupporting

confidence: 59%

Oxidized Carbon-Based Spacers for Pressure-Resistant Graphene Oxide Membranes

et al. 2022

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“…[ 5 ] In many studies, the driving force of vapor permeation is assumed to be a gradient of water pressure on opposite sides of membranes. [ 77,78 ] This pressure gradient (mbar) is significantly smaller compared to the pressure gradient (1–20 bar) used in pressure‐driven filtration experiments. Since the permeance of membranes is usually expressed in units which include pressure, the small gradient of pressure due to difference in humidity between feed and permeate streams in pervaporation experiments results in calculations of huge values, e.g., ≈80 000 L/(m 2 bar h) even for quite common water flux.…”

Section: Discussionmentioning

confidence: 99%

Swelling Pressures of Graphite Oxide and Graphene Oxide Membranes in Water and Ethanol

Iakunkov

Boulanger

Nordenström

et al. 2021

Adv Materials Inter

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the methods commonly used for the preparation of GO thin films and freestanding foils/membranes.Most of the applications cited above are enabled by the ability of GO multilayers to swell in polar solvents similarly to their precursor graphite oxides. [18][19][20][21][22] In this respect GO is similar to very common clay minerals, e.g., montmorillonites, [23] vermiculites, [24] and bentonites. [25] Swelling occurs in these materials due to sorption of water (or other solvents) between 2D layers and the expansion of interlayered distance. [26][27][28] The driving force of swelling is hydration of anions in clay minerals and hydration of interlayer functional groups in GO. The crystalline swelling refers to layer-by-layer intercalation of solvent. Osmotic swelling is controlled by the relatively easy flow of solvent in and out of structure regulated by osmotic effects. [29][30][31][32][33] Remarkably, crystalline swelling is found for Brodie GO in all so far studied solvents except water [34][35][36][37][38] while for Hummers GO only osmotic-like swelling was so far reported. [37,39,40] Adding water to clays under conditions of confinement is known to produce pressures in the range of tens or even hundreds of bar. [25,41,42] Swelling pressure is complex phenomena, which depends on many parameters, e.g., degree of compaction, [25] concentration of salts in solution, [43] temperature [44] etc. It is an important factor, e.g., in construction works since the pressure is sufficient to induce damage in buildings or roads. Swelling pressure has been studied in detail for clay minerals but so far not reported for multilayered GO and graphite oxides. At the same time, the swelling pressure is an important factor affecting performance of GO membranes.The swelling of GO membranes is directly related to the size of "permeation channels" which enable a flow of solvents and solutions. Strong variation in the size of the "permeation channels" is observed in GO membranes depending on the solvent used, [45] concentration and chemical nature of dissolved molecules or ions, [17] shelf storage time, [40] and many other parameters related to the preparation of membranes. For example, the swelling in liquid ethanol was reported with significant scatter providing d(001) values in the range ≈11-17.7 Å. [10,16,46,47] Swelling in longer alcohols provides interlayer distances up to ≈50 Å. [10,48] There are also examples showing that the swelling of GO membranes can be significantly different compared to precursor graphite oxides. [16,17] Strong variation of interlayer distance in swollen GO membranes is a problem for nanofiltration applications, which require Swelling of graphene oxide (GO) membranes and bulk graphite oxide under confinement conditions is found to produce pressures up to ≈220 bar. Swelling pressure is important to take into account in many applications of GO membranes, but it has not been previously reported. Swelling pressures are typically measured only for bulk materials. However, it is demonstrated that even µm thick GO ...

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“…The lamellar microstructure of graphene oxide is represented by an assembly of stacked nanoflakes richly decorated with functional oxygen-containing groups endowing GO with an ability to separate water vapors from gas mixtures for a variety of industrial applications. For instance, GO-based composite membranes can achieve water vapor permeance of 10-60 m 3 •m −2 •bar −1 •h −1 in the relative humidity range of a feed stream from 40 to 90% and can be used for the dehumidification of gases with moderate-to-high concentrations of water vapor [4,5]. Moreover, by adjusting oxygen-to-carbon ratio (C/O ratio), it is possible to tune the permeance-selectivity characteristics of GO-based membranes [6].…”

Section: Introductionmentioning

confidence: 99%

Ageing of graphene oxide thin films: the dynamics of gas and water vapors permeability in time

Chernova¹,

Gurianov²,

Berekchiian³

et al. 2022

Nanosystems: Phys. Chem. Math.

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Composite membranes are formed based on ultrathin 20 nm-thick selective layers of graphene oxide nanoflakes deposited on porous anodic alumina substrates. The long-term dynamics of permanent gases transport and water vapor permeability across the composite membranes is measured during 240 days (8 months). It is revealed that the permeability towards permanent gases remains nearly constant during a prolonged period of time. Contrary, water vapor flux decreases rapidly within the first 30 days from the membrane preparation moment and reaches about 80% of permeability loss during 8 months. The rapid decrease of membrane permeability during the first month could be attributed to a gradual packing of graphene oxide nanoflakes, particularly, locating in the surface sublayers, into more tight microstructure due to the evaporation of remaining solvent (membrane drying) under ambient conditions. Further decrease in permeability during more prolonged time could be caused additionally by deoxygenation of surface GO nanoflakes preventing water vapors diffusion into the GO film. This phenomenon, the so called "ageing" accompanies graphene oxide thin films similarly to some types of highly-permeable polymers. Holding the aged membrane under saturated water vapors, and even liquid water, didn't allow one to revitalize completely its permeability. The obtained results should be taken into account when designing membranes and other devices based on graphene oxide and its derivatives. KEYWORDS graphene oxide nanoflakes, anodic alumina, membrane ageing, dehumidification, water vapor transport. ACKNOWLEDGEMENTS The work is supported by the Russian Science Foundation (project 22-23-00662 "Membranes for molecular filtration and membrane electrocatalysis based on reduced graphene oxide").

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Nanoscale architecture of graphene oxide membranes for improving dehumidification performance

Cited by 6 publications

References 21 publications

Oxidized Carbon-Based Spacers for Pressure-Resistant Graphene Oxide Membranes

Oxidized Carbon-Based Spacers for Pressure-Resistant Graphene Oxide Membranes

Swelling Pressures of Graphite Oxide and Graphene Oxide Membranes in Water and Ethanol

Ageing of graphene oxide thin films: the dynamics of gas and water vapors permeability in time

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