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Article overview
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Exceptionally Fast Water Desalination at Complete Salt Rejection by Pristine Graphyne Monolayers | Minmin Xue
; Hu Qiu
; Wanlin Guo
; | Date: |
2 Sep 2013 | Abstract: | Desalination that produces clean freshwater from seawater holds the promise
to solve the global water shortage for drinking, agriculture and industry.
However, conventional desalination technologies such as reverse osmosis and
thermal distillation involve large amounts of energy consumption, and the
semipermeable membranes widely used in reverse osmosis face the challenge to
provide a high throughput at high salt rejection. Here we find by comprehensive
molecular dynamics simulations and first principles modeling that, pristine
graphyne, one of the graphene like one-atom-thick carbon allotropes, can
achieve 100% rejection of nearly all ions in seawater including Na+, Cl-, Mg2+,
K+ and Ca2+, at an exceptionally high water permeability about two orders of
magnitude higher than those for commercial state-of-the-art reverse osmosis
membranes at a salt rejection of ~98.5%. This complete ion rejection by
graphyne, independent of the salt concentration and the operating pressure, is
revealed to be originated from the significantly higher energy barriers for
ions than that for water. This intrinsic specialty of graphyne should provide a
new possibility for the efforts to alleviate the global shortage of freshwater
and other environmental problems. | Source: | arXiv, 1309.0322 | Services: | Forum | Review | PDF | Favorites |
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