One of the most environmental friendly technique for desalination where electricity applied instead of chemicals. Water with different species like anions, metals and other contaminants is introduced to an electrochemical cell to purify it from contaminants including salt. During polarization, ions are electrostatically removed from the water and adsorbed in electric double layers at the surfaces of electrodes. The output of this process is cleaned water without contaminants.
The Capacitive Deionization Technology (CDI) with carbon aerogel considered new and famous technique where 80% of saline water transfered to pure water with low energy consumption, and very simple method, without producing pollutants like NOX, SO2, and other voltaile organics.
This experiment based on applying current and the two anions, Na+ and Cl- were distributed between the two electrodes of carbon aerogel which they have high surface area.
The absorption of NaCl by the aerogel carbon electrodes reached more than 50% by varying the experimental parameters like voltage, pH, concentration, distance between electrodes and flow. The best conditions were using 2V, pH =5, and a 0.4 cm distance between electrodes. When the distance between electrodes decreased(0.4 cm) the absorption of ions increased due to the formation of electrical double layer and increasing potential between electrodes. For the best removal results a flow of 80 mL/min was used. From our results we can conclude that using capacitive desalination technology(CDI) enhanced the removal of salts from brackish water.