Abstract
A combined experimental and molecular dynamics study revealed the role of oxygen debris (ODs) and functional groups on the nanofiltration performance of a graphene oxide (GO) membrane. A NaOH treatment removed ODs adsorbed onto the graphene oxide (DGO). COOH-decorated GO (CGO) was prepared by controlling the oxidation time of Hummer's method, resulting in 45% of carbons with a COOH group. The water permeance of the prepared GO membrane without ODs was 1 order of magnitude greater than that of GO membranes in our experiments: 1.24, 1.59, and 14.7 L m -2 h -1 bar -1 for GO, CGO, and DGO. However, the rejection of dye molecules below 1 nm in size was dramatically reduced without ODs, indicating that ODs play a critical role in rejecting molecules below 1 nm in size because of electrostatic and hydrogen bonding interactions and by narrowing the effective interlayer spacing, as noted in molecular simulations. Additionally, the CGO membrane displayed a similar separation performance compared to common GO membrane mainly decorated with OH and epoxy.
| Original language | English |
|---|---|
| Pages (from-to) | 17507-17517 |
| Number of pages | 11 |
| Journal | Journal of Physical Chemistry C |
| Volume | 122 |
| Issue number | 30 |
| DOIs | |
| Publication status | Published - 2018 Aug 2 |
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All Science Journal Classification (ASJC) codes
- Electronic, Optical and Magnetic Materials
- Energy(all)
- Physical and Theoretical Chemistry
- Surfaces, Coatings and Films
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Revealing the Role of Oxygen Debris and Functional Groups on the Water Flux and Molecular Separation of Graphene Oxide Membrane : A Combined Experimental and Theoretical Study. / Kim, Daewoo; Jang, Jidon; Kim, In; Nam, Yoon Tae; Jung, Yousung; Jung, Hee Tae.
In: Journal of Physical Chemistry C, Vol. 122, No. 30, 02.08.2018, p. 17507-17517.Research output: Contribution to journal › Article
TY - JOUR
T1 - Revealing the Role of Oxygen Debris and Functional Groups on the Water Flux and Molecular Separation of Graphene Oxide Membrane
T2 - A Combined Experimental and Theoretical Study
AU - Kim, Daewoo
AU - Jang, Jidon
AU - Kim, In
AU - Nam, Yoon Tae
AU - Jung, Yousung
AU - Jung, Hee Tae
PY - 2018/8/2
Y1 - 2018/8/2
N2 - A combined experimental and molecular dynamics study revealed the role of oxygen debris (ODs) and functional groups on the nanofiltration performance of a graphene oxide (GO) membrane. A NaOH treatment removed ODs adsorbed onto the graphene oxide (DGO). COOH-decorated GO (CGO) was prepared by controlling the oxidation time of Hummer's method, resulting in 45% of carbons with a COOH group. The water permeance of the prepared GO membrane without ODs was 1 order of magnitude greater than that of GO membranes in our experiments: 1.24, 1.59, and 14.7 L m -2 h -1 bar -1 for GO, CGO, and DGO. However, the rejection of dye molecules below 1 nm in size was dramatically reduced without ODs, indicating that ODs play a critical role in rejecting molecules below 1 nm in size because of electrostatic and hydrogen bonding interactions and by narrowing the effective interlayer spacing, as noted in molecular simulations. Additionally, the CGO membrane displayed a similar separation performance compared to common GO membrane mainly decorated with OH and epoxy.
AB - A combined experimental and molecular dynamics study revealed the role of oxygen debris (ODs) and functional groups on the nanofiltration performance of a graphene oxide (GO) membrane. A NaOH treatment removed ODs adsorbed onto the graphene oxide (DGO). COOH-decorated GO (CGO) was prepared by controlling the oxidation time of Hummer's method, resulting in 45% of carbons with a COOH group. The water permeance of the prepared GO membrane without ODs was 1 order of magnitude greater than that of GO membranes in our experiments: 1.24, 1.59, and 14.7 L m -2 h -1 bar -1 for GO, CGO, and DGO. However, the rejection of dye molecules below 1 nm in size was dramatically reduced without ODs, indicating that ODs play a critical role in rejecting molecules below 1 nm in size because of electrostatic and hydrogen bonding interactions and by narrowing the effective interlayer spacing, as noted in molecular simulations. Additionally, the CGO membrane displayed a similar separation performance compared to common GO membrane mainly decorated with OH and epoxy.
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U2 - 10.1021/acs.jpcc.8b03318
DO - 10.1021/acs.jpcc.8b03318
M3 - Article
AN - SCOPUS:85049879800
VL - 122
SP - 17507
EP - 17517
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
SN - 1932-7447
IS - 30
ER -