The key to making nanoporous graphene work in this desalination process is getting the size of the pores just right. If the pores are too big, the salt can pass right through; and, conversely, if the they are too small, the water will be blocked. According to Jeffrey Grossman, the Carl Richard Soderberg Associate Professor of Power Engineering in MIT’s Department of Materials Science and Engineering, the ideal size range is extremely limited and looks to be 1 nanometer. If the pores are slightly smaller, 0.7 nanometers, the water won’t pass through the membrane at all.
Because the graphene is a thousand times thinner than the traditional membrane materials it requires far less force—and therefore energy—to push the water molecules through it
looks like the trick is being able to manufacture (up scale) this using existing method, still it looks promising for the future.
Graphene affordable water dealination
http://www.futuretimeline.net/blog/2013/03/22-2.htm#.UaP138pz524
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