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Electrochemical treatment of aqueous solutions containing urea

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Abstract

Investigations on the anodic decomposition of urea using Ti/Pt and Ti/(RuO2–TiO2)40:60 electrodes were carried out. The kinetics of the process were examined in a periodic electrolyser. The effect of anodic current density, initial urea concentration, and sodium chloride concentration on the effectiveness of the basic process (average rate of urea decomposition, current efficiency, and unit power consumption) is discussed. When a Ti/Pt electrode is applied for urea removal from aqueous solution urea is not decomposed directly at the surface of the electrode, but rather in the bulk of the solution by hypochlorite formed during the process. When the Ti/(RuO2–TiO2)40:60 electrode is used for the removal of urea from aqueous solutions, the reaction of urea with chlorine adsorbed at the electrode predominates. In both cases non-toxic products of urea decomposition (N2, CO2,) are formed. Comparison of the effectiveness of anodic decomposition of urea for the Ti/Pt and Ti/(RuO2–TiO2)40:60 electrodes in the periodic electrolyser at optimum process parameters has revealed that the former electrode is more favorable.

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Authors and Affiliations

  1. Department of Inorganic Chemistry and Technology, Faculty of Chemistry, Silesian University of Technology, B. Krzywoustego 6, 44-100, Gliwice, Poland

    Wojciech Simka, Jerzy Piotrowski, Adam Robak & Ginter Nawrat

Authors
  1. Wojciech Simka
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  2. Jerzy Piotrowski
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  3. Adam Robak
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  4. Ginter Nawrat
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Correspondence to Wojciech Simka.

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Simka, W., Piotrowski, J., Robak, A. et al. Electrochemical treatment of aqueous solutions containing urea. J Appl Electrochem 39, 1137–1143 (2009). https://doi.org/10.1007/s10800-008-9771-4

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  • DOI: https://doi.org/10.1007/s10800-008-9771-4

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