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Journal of Applied Electrochemistry

, Volume 34, Issue 5, pp 551–556 | Cite as

Electrochemical Degradation of Nitroaromatic Wastes in Sulfuric Acid Solutions: Part I

  • N.E. Jiménez Jado
  • C. Fernández SánchezEmail author
  • J.R. Ochoa Gómez
Article

Abstract

This paper describes the development of electrochemical processes for the oxidative degradation of nitroaromatic compounds, including 2-nitrotoluene, 2-nitroaniline and 4-nitroaniline, in acid wastewaters. The electrolysis process results in the formation of a dark solution in which the concentration of nitroaromatics had been reduced to much lower levels and COD removal efficiencies reached 50%. It was found that the best electrolysis conditions were 96% acid strength, 1000 A m−2 current density and ambient temperature. In addition, electrochemical degradations were always more effective when substituents are in the para-position and lead to significant electrophilic character. A black powdery product was isolated from the dark solution; this resulted from the anodic oxidation of amines initially produced at the cathode. The black product was further destroyed by anodic oxidation during prolonged electrolysis.

COD removal efficiency electrochemical oxidation nitroaromatic degradation refractory pollutants wastewater treatment 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • N.E. Jiménez Jado
    • 1
  • C. Fernández Sánchez
    • 1
    Email author
  • J.R. Ochoa Gómez
    • 2
  1. 1.Organic Chemistry DepartmentAlcalá UniversityAlcalá de Henares, MadridSpain
  2. 2.Industrial Technology DepartmentAlfonso X UniversityMadridSpain

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