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

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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.
Publisher
AMER CHEMICAL SOC
Issue Date
2018-08
Language
English
Article Type
Article
Keywords

NANOFILTRATION MEMBRANES; CARBON NANOTUBES; OXIDATION DEBRIS; FILMS; PERMEATION; CHEMISTRY; REJECTION; TRANSPORT; DENSITY

Citation

JOURNAL OF PHYSICAL CHEMISTRY C, v.122, no.30, pp.17507 - 17517

ISSN
1932-7447
DOI
10.1021/acs.jpcc.8b03318
URI
http://hdl.handle.net/10203/245181
Appears in Collection
EEW-Journal Papers(저널논문)CBE-Journal Papers(저널논문)
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