The feasibility of boron removal from water by capacitive deionization

Eran Avraham, Malachi Noked, Abraham Soffer, Doron Aurbach

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Abstract

We report on the possibility of removing boron (in the form of boric acid) from water by electrochemical means. We explore capacitive de-ionization (CDI) processes in which local changes in pH near the surface of high-surface-area activated carbon fiber (ACF) electrodes during charging are utilized, in order to dissociate boric acid into borate ions which can be electro-adsorbed onto the positive electrode in the CDI cells. For this purpose, a special flow-through CDI cell was constructed in which the feed solution flows through the electrodes. Local pH changes near the carbon electrode surface were investigated using a MgCl2 solution probe in three- (with reference) and two-electrode cells, and described qualitatively. We show that, to a certain extent, boron can indeed be removed from water by CDI.

Original languageEnglish
Pages (from-to)6312-6317
Number of pages6
JournalElectrochimica Acta
Volume56
Issue number18
DOIs
StatePublished - 15 Jul 2011

Keywords

  • Boron removal
  • Capacitive deionization
  • Electro-adsorbtion

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