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 Å in a dry state. It was experimentally determined that the minimum spacing allowing water permeation was 5.7 Å (9.6 Å in water), and no water permeated at 5.0 Å or less. For ion permeation, a pure GO membrane exhibited similar permeability for most ions, while the permeability of GO membrane with 5.7 Å 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 SO4 2− and Fe(CN)6 3−. Our reduced GO membrane could be used to effectively block the permeation of large ions and multivalent anions.
| Original language | English |
|---|---|
| Article number | 117394 |
| Journal | Journal of Membrane Science |
| Volume | 592 |
| DOIs | |
| Publication status | Published - 2019 Dec 15 |
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Keywords
- Dehydration
- Graphene oxide
- Interlayer spacing
- Reduction
- Swelling
ASJC Scopus subject areas
- Biochemistry
- Materials Science(all)
- Physical and Theoretical Chemistry
- Filtration and Separation
Cite this
Near-complete blocking of multivalent anions in graphene oxide membranes with tunable interlayer spacing from 3.7 to 8.0 angstrom. / Kim, Jongwoon; Lee, Seung Eun; Seo, Seunghwan; Woo, Ju Yeon; Han, Chang-Soo.
In: Journal of Membrane Science, Vol. 592, 117394, 15.12.2019.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Near-complete blocking of multivalent anions in graphene oxide membranes with tunable interlayer spacing from 3.7 to 8.0 angstrom
AU - Kim, Jongwoon
AU - Lee, Seung Eun
AU - Seo, Seunghwan
AU - Woo, Ju Yeon
AU - Han, Chang-Soo
PY - 2019/12/15
Y1 - 2019/12/15
N2 - 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 Å in a dry state. It was experimentally determined that the minimum spacing allowing water permeation was 5.7 Å (9.6 Å in water), and no water permeated at 5.0 Å or less. For ion permeation, a pure GO membrane exhibited similar permeability for most ions, while the permeability of GO membrane with 5.7 Å 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 SO4 2− and Fe(CN)6 3−. Our reduced GO membrane could be used to effectively block the permeation of large ions and multivalent anions.
AB - 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 Å in a dry state. It was experimentally determined that the minimum spacing allowing water permeation was 5.7 Å (9.6 Å in water), and no water permeated at 5.0 Å or less. For ion permeation, a pure GO membrane exhibited similar permeability for most ions, while the permeability of GO membrane with 5.7 Å 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 SO4 2− and Fe(CN)6 3−. Our reduced GO membrane could be used to effectively block the permeation of large ions and multivalent anions.
KW - Dehydration
KW - Graphene oxide
KW - Interlayer spacing
KW - Reduction
KW - Swelling
UR - http://www.scopus.com/inward/record.url?scp=85071007873&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85071007873&partnerID=8YFLogxK
U2 - 10.1016/j.memsci.2019.117394
DO - 10.1016/j.memsci.2019.117394
M3 - Article
VL - 592
JO - Jornal of Membrane Science
JF - Jornal of Membrane Science
SN - 0376-7388
M1 - 117394
ER -