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Individual and competitive removal of heavy metals using capacitive deionization.
- Source :
-
Journal of Hazardous Materials . Jan2016, Vol. 302, p323-331. 9p. - Publication Year :
- 2016
-
Abstract
- This study presents the viability and preference of capacitive deionization (CDI) for removing different heavy metal ions in various conditions. The removal performance and mechanisms of three ions, cadmium (Cd 2+ ), lead (Pb 2+ ) and chromium (Cr 3+ ) were investigated individually and as a mixture under different applied voltages and ion concentrations. It was found that CDI could effectively remove these metals, and the performance was positively correlated with the applied voltage. When 1.2 V was applied into solution containing 0.5 mM individual ions, the Cd 2+ , Pb 2+ , and Cr 3+ removal was 32%, 43%, and 52%, respectively, and the electrosorption played a bigger role in Cd 2+ removal than for the other two ions. Interestingly, while the removal of Pb 2+ and Cr 3+ remained at a similar level of 46% in the mixture of three ions, the Cd 2+ removal significantly decreased to 14%. Similar patterns were observed when 0.05 mM was used to simulate natural contaminated water condition, but the removal efficiencies were much higher, with the removal of Pb 2+ , Cr 3+ , and Cd 2+ increased to 81%, 78%, and 42%, respectively. The low valence charge and lack of physical sorption of Cd 2+ were believed to be the reason for the removal behavior, and advanced microscopic analysis showed clear deposits of metal ions on the cathode surface after operation. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03043894
- Volume :
- 302
- Database :
- Academic Search Index
- Journal :
- Journal of Hazardous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 111168318
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2015.09.064