In this work, the fundamental aspect of electrosorption of
NaCl was investigated. Due to the good double layer
capacitive characteristics, nanostructured carbon aerogel
has been shown to successfully remove NaCl from aqueous
solutions. The mechanism is mainly due to electrostatic
interactions, associated with EDL formation on the charged
surface of carbon electrode. Therefore, the regeneration of
the electrodes can be achieved by depolarization of each
electrode. Based on these experimental data, the electrosorption
performance, as well as EDL capacitance and
electrosorption capacity, can be raised by increasing the
applied voltage and solution concentration, and thereby,
more surface area can be utilized to electroadsorb ions
from aqueous solutions. Three factors can explain this
phenomenon: (1) the high polarization of carbon electrodes
corresponds to stronger electrostatic attraction; (2) the high
solution concentration enhances the transport rate of ions,
as a result of the higher concentration gradient; and (3) the
double layer compression under high applied potential and
solution concentration can reduce the effect of EDL overlapping,
accompanied with more available surface area for
electrosorption of ions. The results of this work are very
important in promoting CDI processes and their practical
use for water purification and desalination.
In this work, the fundamental aspect of electrosorption ofNaCl was investigated. Due to the good double layercapacitive characteristics, nanostructured carbon aerogelhas been shown to successfully remove NaCl from aqueoussolutions. The mechanism is mainly due to electrostaticinteractions, associated with EDL formation on the chargedsurface of carbon electrode. Therefore, the regeneration ofthe electrodes can be achieved by depolarization of eachelectrode. Based on these experimental data, the electrosorptionperformance, as well as EDL capacitance andelectrosorption capacity, can be raised by increasing theapplied voltage and solution concentration, and thereby,more surface area can be utilized to electroadsorb ionsfrom aqueous solutions. Three factors can explain thisphenomenon: (1) the high polarization of carbon electrodescorresponds to stronger electrostatic attraction; (2) the highsolution concentration enhances the transport rate of ions,as a result of the higher concentration gradient; and (3) thedouble layer compression under high applied potential andsolution concentration can reduce the effect of EDL overlapping,accompanied with more available surface area forelectrosorption of ions. The results of this work are veryimportant in promoting CDI processes and their practicaluse for water purification and desalination.
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