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Enhancement of Selective Removal of Nitrate Ions from a Mixture of Anions Using a Carbon Electrode Coated with Ion-exchange Resin Powder  

Yeo, Jin-Hee (Department of Chemical Engineering, Kongju National University)
Choi, Jae-Hwan (Department of Chemical Engineering, Kongju National University)
Publication Information
Applied Chemistry for Engineering / v.24, no.1, 2013 , pp. 49-54 More about this Journal
Abstract
We fabricated a composite carbon electrode to remove nitrate ions selectively from a mixed solution of anions. The electrode was fabricated by coating the surface of a carbon electrode with the nitrate-selective anion exchange resin (BHP55, Bonlite Co.) powder. We performed capacitive deionization (CDI) experiments on a mixed solution containing chloride, nitrate, and sulfate ions using a BHP55 cell constructed with the fabricated electrode. The removal of nitrate ions in the BHP55 cell was compared to that of a membrane capacitive deionization (MCDI) cell constructed with ion exchange membranes. The total quantity of ions adsorbed in BHP55 cell was $38.3meq/m^2$, which is 31% greater than that of MCDI cell. In addition, the number of nitrate adsorption in the BHP55 cell was $15.9meq/m^2$ (42% of total adsorption), 2.1 times greater than the adsorption in the MCDI cell. The results showed that the fabricated composite carbon electrode is very effective in the selective removal of nitrate ions from a mixed solution of anions.
Keywords
ion exchange resin; carbon electrode; capacitive deionization; nitrate; selective removal;
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