Mg, Ca, K, Na ions Removal Capability by Capacitive Deionization Cells

Izaak Cohen izaakco@gmail.com Barak Shapira Eran Avraham Doron Aurbach
Chemistry, Bar-Ilan university, Ramat Gan, Israel

The need for water purification systems that are: environmental friendly, low cost and require low amount of energy, are vastly needed. This presentation will focus about one of the candidates, which goes by the name: Capacitive deionization (CDI). It is a technology that makes use of high surface electrodes to desalinate water by producing an electrical double layer, which is combined of charge and counter-ions. E.g. above the positive charged electrode, due to positive polarization, a layer of anions, that come from the bulk solution, is produced. The charge can be used back to charge other CDI cell or energy storage cell, thus by calculation, when desalinating brackish water that contains TDS between 300 to 2000 PPM, the technology has the potential to become a good candidate for water purification system.1,2 The study compares CDI desalination performance of 4 types of salt: MgCl2, CaCl2, KCl and NaCl, while using three different types of CDI cells. The results indicate high removal capability for the magnesium ions, as it was participated, because magnesium is a divalent ion.3 In contrast, calcium ion is also divalent ion but the removal of calcium ions gave the lowest removal capability. This presentation will try to give an explanation to this phenomenon.

Reference:

  1. S. Porada, R. Zhao, a. van der Wal, V. Presser and P. M. Biesheuvel, Prog. Mater. Sci., 58, 1388–1442 (2013).
  2. S. M. E. Suss and V. Presser, Energy Environ. Sci., 8, 2296–2319 (2015).
  3. S. Seo, H. Jeon, J. Kwang, G. Kim, D. Park, H. Nojima, J. Lee and S. Moon, Water Res., 44, 2267–2275 (2010).








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