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Drinking water from sunlight and seawater
Salt and other charged particles are diverted off, leaving desalted water to flow down a separate channel © Nature Nanotechnology
A device that can 'push' the salt out of seawater has been developed by US researchers. Efficient enough to be powered by sunlight, the process could lead to small-scale or portable desalination devices that could provide vital drinking water in disaster zones or areas of severe drought.
Using modern semi-permeable membranes to convert seawater into fresh water is increasingly popular as a solution to global water shortages. Two common techniques are reverse osmosis, where seawater is forced through a sieve-like membrane to filter out salt - and electrodialysis, which uses electrical current to pull salt ions through a membrane. More...
http://www.rsc.org/chemistryworld/News/2010/March/21031002.asp
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