Designing carbon nanotube membranes for efficient water desalination
Date
2008
Authors
Corry, Ben
Journal Title
Journal ISSN
Volume Title
Publisher
American Chemical Society
Abstract
The transport of water and ions through membranes formed from carbon nanotubes ranging in diameter from 6 to 11 A is studied using molecular dynamics simulations under hydrostatic pressure and equilibrium conditions. Membranes incorporating carbon nanotubes are found to be promising candidates for water desalination using reverse osmosis, and the size and uniformity of tubes that is required to achieve a desired salt rejection is determined. By calculating the potential of mean force for ion and water translocation, we show that ions face a large energy barrier and will not pass through the narrower tubes studied ((5,5) and (6,6) "armchair" type tubes) but can pass through the wider (7,7) and (8,8) nanotubes. Water, however, faces no such impediment due to the formation of stable hydrogen bonds and crosses all of the tubes studied at very large rates. By measuring this conduction rate under a hydrostatic pressure difference, we show that membranes incorporating carbon nanotubes can, in principle, achieve a high degree of desalination at flow rates far in excess of existing membranes.
Description
Keywords
Keywords: Computer simulation; Desalination; Hydrostatic pressure; Molecular dynamics; Osmosis; Conduction rate; Water desalination; Water translocation; Carbon nanotubes; nanotube; sodium chloride; water; algorithm; article; artificial membrane; chemistry; compute
Citation
Collections
Source
Journal of Physical Chemistry B
Type
Journal article
Book Title
Entity type
Access Statement
License Rights
Restricted until
2037-12-31
Downloads
File
Description