The role of oxidation level in mass-transport properties and dehumidification performance of graphene oxide membranes

被引:36
作者
Chernova, E. A. [1 ]
Petukhov, D. I. [1 ,2 ]
Chumakov, A. P. [3 ]
Kirianova, A. V. [1 ]
Sadilov, I. S. [1 ]
Kapitanova, O. O. [2 ]
Boytsova, O. V. [1 ,4 ]
Valeev, R. G. [5 ]
Roth, S. V. [3 ,6 ]
Eliseev, Ar A. [2 ]
Eliseev, An A. [1 ]
机构
[1] Lomonosov Moscow State Univ, Dept Mat Sci, 1-73 Leninskiye Gory, Moscow 119991, Russia
[2] Lomonosov Moscow State Univ, Dept Chem, 1-3 Leninskiye Gory, Moscow 119991, Russia
[3] DESY Deutsch Elekt Synchrotron, Notkestr 85, D-22607 Hamburg, Germany
[4] RAS, Kurnakov Inst Gen & Inorgan Chem, Leninsky Ave 31, Moscow 119991, Russia
[5] Russian Acad Sci UdmFRC UB RAS, Udmurt Fed Res Ctr, Ural Brunch, St Them Tatiana Baramzina 34, Izhevsk 426067, Russia
[6] KTH Royal Inst Technol, Dept Fibre & Polymer Technol, Teknikringen 56-58, SE-10044 Stockholm, Sweden
基金
俄罗斯基础研究基金会;
关键词
Graphene oxide membranes; Graphene oxide oxidation degree; Air dehumidification; Vapor transport; Labyrinthine transport; GRAPHITE OXIDE; WATER-VAPOR; GAS; PERMEATION; SEPARATION; REDUCTION; SOLVATION; SOLVENTS;
D O I
10.1016/j.carbon.2021.07.011
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Here we report on gas and vapor transport properties of ultra-thin graphene oxide (GO) membranes, with various C:O ratios. Graphene oxide nanosheets with an average lateral size of 800 nm and C:O ratio ranging from 2.11 to 1.81 have been obtained using improved Hummers' method by variation of graphite:KMnO4 ratio. Thin-film selective layers based on the obtained graphene oxide have been spin-coated onto porous substrates. To extend the C:O range to 2.60, thermal reduction of GO membranes was applied. A decrease in C:O ratio leads to significant water vapor permeance growth to over 60 m(3)(STP).m(-2).bar(-1).h(-1) while the permeance towards permanent gases reduces slightly. According to the permeation and sorption measurements, a decisive role of H2O diffusivity has been established, while the water sorption capacity of the graphene oxide stays nearly independent of C:O ratio in GO. The result is supported by semi-empirical modeling which reveals diminution of H2O jump activation barriers with both increasing GO interlayer spacing and its oxidation degree. The height of the activation barriers was found to vary up to an order of magnitude within the entire range of relative humidity (0-100% RH), lowering significantly for strongly oxidized GO. Our results evidence the necessity of attaining maximum GO oxidation degree for improving water transport in GO, especially at low partial pressures. (C) 2021 Published by Elsevier Ltd.
引用
收藏
页码:404 / 414
页数:11
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