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Synergistic effects of crystal structure and surface chemistry of stacked graphene-oxide membranes on the water-permeation mechanism
- Source :
- Desalination. 492:114603
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Stacked graphene-oxide (GO) membranes have been reported to have promising potential for desalination. One key issue in the development of such membranes is understanding the atomistic water-permeation mechanism determined by the highly variable nature of GO (including membrane morphology, surface chemistry, osmotic pressure, and surface area). To clearly understand this variability, not only individual but also synergistic effects, i.e., the nonlinear cumulative effects of membrane properties, should be investigated. Hence, this paper explores how lateral and vertical permeation mechanisms differ with changes in the morphology and surface chemistry, either discretely or simultaneously, using both experiments and simulations. Experiments reveal that the GO water-permeation performance is dominated by the heterogeneous structural and chemical nature of GO. To investigate individual and synergistic effects on water dynamics, we performed molecular-dynamics simulations. The synergistic effects were more marked on the lateral permeation mechanisms than on the vertical mechanism in GO membranes. When the membrane nanochannels had a narrow intersheet distance or no gap overlap, the lateral permeation mechanism was found to be completely different owing to the interplay between these properties.
- Subjects :
- Morphology (linguistics)
Chemistry
Graphene
Mechanical Engineering
General Chemical Engineering
Oxide
General Chemistry
Crystal structure
Permeation
Desalination
law.invention
chemistry.chemical_compound
Membrane
Chemical engineering
law
Osmotic pressure
General Materials Science
Water Science and Technology
Subjects
Details
- ISSN :
- 00119164
- Volume :
- 492
- Database :
- OpenAIRE
- Journal :
- Desalination
- Accession number :
- edsair.doi...........9721c6e45b183b8d77f31c6cff492a3e