Journal
DESALINATION
Volume 399, Issue -, Pages 171-177Publisher
ELSEVIER
DOI: 10.1016/j.desal.2016.09.011
Keywords
Electrosorption; Capacitive deionization; Selectivity; Hydration ratio; Desalination
Categories
Funding
- National High Technology Research and Development Program (863 Program) [2012AA062605]
- National Natural Science Foundation of China (NSFC) [21176134]
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The electrosorption performances of different ions in a capacitive deionization process were studied. The hydration ratio, i.e., the ratio of hydrated radius to ion radius, significantly affects the electrosorption capacity and selectivity. In a mono-ionic solution, ions with low hydration ratios exhibit high electrosorption capacities. The electrosorption capacity demonstrates a negative linear relationship with the hydration ratio for both anions and cations. In a multi-ionic solution, the monovalent ions with low hydration ratios exhibited high electrosorption selectivity. Divalent ions adsorb more easily onto electrode surface than monovalent ions do, resulting in higher electrosorption selectivity. In the late period of the electrosorption, the adsorbed ions were partly substituted by ions with lower hydration ratios or a higher valence. The hydration ratio and valence affect the ions' electrostatic attraction to the electrodes, determining the electrosorption capacity and selectivity of ions in capacitive deionization. (C) 2016 Elsevier B.V. All rights reserved.
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