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Near-complete blocking of multivalent anions in graphene oxide membranes with tunable interlayer spacing from 3.7 to 8.0 angstrom

Authors
Kim, JongwoonLee, Seung EunSeo, SeunghwanWoo, Ju YeonHan, Chang-Soo
Issue Date
15-12월-2019
Publisher
ELSEVIER
Keywords
Graphene oxide; Interlayer spacing; Reduction; Swelling; Dehydration
Citation
JOURNAL OF MEMBRANE SCIENCE, v.592
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF MEMBRANE SCIENCE
Volume
592
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/60916
DOI
10.1016/j.memsci.2019.117394
ISSN
0376-7388
Abstract
Graphene oxide (GO) membranes have attracted attention as a promising candidate for selective ion permeation due to narrow interlayer spacing. Among several methods to control the interlayer spacing, the reduction of GO membranes has great potential for desalination and water purification. To apply GO membranes for ion separation, investigating ion transport of sub-nanometer channels of reduced GO membranes is needed. In this study, thermally and chemically reduced GO membranes were fabricated with different interlayer spacing ranging from 3.7 to 8.0 angstrom in a dry state. It was experimentally determined that the minimum spacing allowing water permeation was 5.7 angstrom (9.6 angstrom in water), and no water permeated at 5.0 angstrom or less. For ion permeation, a pure GO membrane exhibited similar permeability for most ions, while the permeability of GO membrane with 5.7 A spacing was strongly dependent of the size and charge of ions. The permeability of cations significantly changed along with the ionic radius, while there was a noticeable cutoff for permeability of multivalent anions such as SO42- and Fe(CN)(6)(3-). Our reduced GO membrane could be used to effectively block the permeation of large ions and multivalent anions.
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공과대학 (기계공학부)
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