Sorption and diffusion selectivity of water-ethanol transport in graphene oxide membranes

Gurianov, K.E.; Astvatsaturov, D.A.; Lesnykh, A.A.; Chumakov, A.; Eliseev, A.A.; Kolesnik, I.V.; Zhang, L.; Chumakova, N.A.; Eliseev, A.A.

Авторы: Gurianov Konstantin E., Astvatsaturov Dmitry A., Lesnykh Alexandra A., Chumakov Andrei, Eliseev Artem A., Kolesnik Irina V., Zhang Lizhi, Chumakova Natalia A., Eliseev Andrei A.
Журнал: Journal of Membrane Science
Том: 741
Год издания: 2026
Издательство: Elsevier BV
Местоположение издательства: Netherlands
Номер статьи: 125016
DOI: 10.1016/j.memsci.2025.125016
Аннотация: The paper reports on ethanol and water vapors sorption and diffusivity in hardly oxidized Hummers graphene oxide (GO) membranes (flake size ~6 μm, thickness ~100 nm) investigated with in situ and in operando X-ray scattering, IR spectroscopy, spin probe electron paramagnetic resonance (EPR) and permeance measurements. Both volumetric and mass sorption isotherms were established for swelling of GO membranes depending on partial pressure of water and ethanol vapors. It has been shown that the nanoslits widening in GO from ~0.75 to ~1.35 nm occurs with sorption of up to ~0.045 mol/g(GO) for water and ~0.009 mol/g(GO) for ethanol, corresponding accommodation of up to 1.24H2O or 0.24C2H5OH molecules per carbon atom. The membranes exhibit very low permeance towards ethanol vapors (<8.5⋅10 10 mol m2 Pa 1⋅s 1), while revealing typical GO permeance of ~1⋅10 6 mol m2 Pa 1⋅s 1 for water molecules. A huge (>3 orders of magnitude) difference in H2O and C2H5OH permeance is explained with preferential sorption of water and significant difference of the activation barriers for water and ethanol transport in nanoslits. Sorption selectivity for H2O:C2H5OH pair of over 50 was disclosed with in-situ IR measurements, and the effect of nanoslit width on molecular diffusivity adding a factor of 10 was exposed with EPR of spin probes. Both preferential sorption and diffusivity of water was confirmed with semi-empirical modelling, exposing a strong impact of guest phase density on a barrier height. The results are instructive for application of GO in separation of water-alcohol and water-organic solvent mixtures.
Добавил в систему: Гурьянов Константин Евгеньевич

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Sorption and diffusion selectivity of water-ethanol transport in graphene oxide membranesстатья Исследовательская статья

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