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- Title
Water desalination using nanoporous single-layer graphene.
- Authors
Surwade, Sumedh P.; Smirnov, Sergei N.; Vlassiouk, Ivan V.; Unocic, Raymond R.; Veith, Gabriel M.; Dai, Sheng; Mahurin, Shannon M.
- Abstract
By creating nanoscale pores in a layer of graphene, it could be used as an effective separation membrane due to its chemical and mechanical stability, its flexibility and, most importantly, its one-atom thickness. Theoretical studies have indicated that the performance of such membranes should be superior to state-of-the-art polymer-based filtration membranes, and experimental studies have recently begun to explore their potential. Here, we show that single-layer porous graphene can be used as a desalination membrane. Nanometre-sized pores are created in a graphene monolayer using an oxygen plasma etching process, which allows the size of the pores to be tuned. The resulting membranes exhibit a salt rejection rate of nearly 100% and rapid water transport. In particular, water fluxes of up to 106 g m−2 s−1 at 40 °C were measured using pressure difference as a driving force, while water fluxes measured using osmotic pressure as a driving force did not exceed 70 g m−2 s−1 atm−1.
- Subjects
GRAPHENE; SALINE water conversion; NANOPOROUS materials; PLASMA etching; OSMOTIC pressure
- Publication
Nature Nanotechnology, 2015, Vol 10, Issue 5, p459
- ISSN
1748-3387
- Publication type
Article
- DOI
10.1038/nnano.2015.37