Electrode desalination without an applied current

A group of European researchers have evolved a desalination technology by creating an ion adsorption/desorption cycle without using an applied cell voltage.

In a paper for the American Chemical Society's Journal of Physical Chemistry Letters (2012, 3 (12)), the researchers, who work at the Wetsus centre and Wageningen University in the Netherlands, describe their development as Water Desalination With Wires.

Their novel capacitive technology involves anode/cathode wire pairs constructed from electrically conducting rods coated with a thin porous electrode layer of carbon. By alternately dipping an array of electrode pairs in fresh water and brine without an applied voltage, an ion adsorption/desorption cycle can be created.

They have shown experimentally how, in six subsequent cycles, the salinity of a brackish feedwater (20 mM - millimolars) can be reduced by a factor of 3. Potable water has a salinity of <15 mM.

Though unsuitable for seawater desalination, the researchers believe their method could compete with other technologies in certain brackish situations because of its low cost.

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