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Ultrathin graphene oxide membrane with constructed tent-shaped structures for efficient and tunable molecular sieving
- Source :
- Environmental Science: Nano. 7:2373-2384
- Publication Year :
- 2020
- Publisher :
- Royal Society of Chemistry (RSC), 2020.
-
Abstract
- Graphene oxide membranes (GOMs) continue to attract intense interest because of their promising two-dimensional channels. However, finely adjusting a GOM's interplanar spacing for tunable molecular separation is still challenging in aqueous solution. Herein, we report tent-shaped interplanar channels that can be constructed by loading SiO2 nanospheres (diameter ≈ 30 nm) into ultrathin GOMs (thickness ≈ 20 nm). The tent-shaped structure takes advantage of the augmented space to accelerate the flux while utilizing the preserved circumjacent nano-channel as a molecular sieve. Particularly, by adjusting the density of intercalated SiO2 nanospheres, the concomitant interlayer channel can be finely tuned with molecular-level accuracy. Precise selectivity makes the SiO2 loaded GOM (SGM) capable of separating molecules with sub-nanometer differences. At the same time, under the premise of the same rejection, tunable channels endow SGMs with 1.3–63 times higher permeability than that of a pristine ultrathin GOM. This tent-shaped structure supplies a new avenue for GOM structural regulation, and the impressive performance demonstrates its great potential in the fields of water purification and membrane filtration.
- Subjects :
- Aqueous solution
Materials science
Graphene
Materials Science (miscellaneous)
Oxide
Nanotechnology
02 engineering and technology
010402 general chemistry
021001 nanoscience & nanotechnology
Molecular sieve
01 natural sciences
0104 chemical sciences
law.invention
chemistry.chemical_compound
Membrane
chemistry
law
Molecule
0210 nano-technology
Selectivity
Filtration
General Environmental Science
Subjects
Details
- ISSN :
- 20518161 and 20518153
- Volume :
- 7
- Database :
- OpenAIRE
- Journal :
- Environmental Science: Nano
- Accession number :
- edsair.doi...........331d3c5ad53590945550ccfdbc13cab7