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Electro-oxidation of the dye azure B: kinetics, mechanism, and by-products

  • Electrochemical advanced oxidation processes for removal of toxic/persistent organic pollutants from water
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Abstract

In this work, the electrochemical degradation of the dye azure B in aqueous solutions was studied by electrochemical advanced oxidation processes (EAOPs), electro-Fenton, and anodic oxidation processes, using Pt/carbon-felt and boron-doped diamond (BDD)/carbon-felt cells with H2O2 electrogeneration. The higher oxidation power of the electro-Fenton (EF) process using BDD anode was demonstrated. The oxidative degradation of azure B by the electrochemically generated hydroxyl radicals (•OH) follows a pseudo-first-order kinetics. The apparent rate constants of the oxidation of azure B by •OH were measured according to pseudo-first-order kinetic model. The absolute rate constant of azure B hydroxylation reaction was determined by competition kinetics method and found to be 1.19 × 109 M−1 s−1. It was found that the electrochemical degradation of the dye leads to the formation of aromatic by-products which are then oxidized to aliphatic carboxylic acids before their almost mineralization to CO2 and inorganic ions (sulfate, nitrate, and ammonium). The evolution of the TOC removal and time course of short-chain carboxylic acids during treatment were also investigated.

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Acknowledgments

Hugo Olvera Vargas would like to thank the European Commission for the financial support through the Erasmus Mundus Joint Doctorate Programme ETeCoS3, Université Paris-Est, as well as the program VINCI 2012. C.T. Aravindakumar acknowledges Université Paris-Est Marne-la-Vallée for the invited Professor position.

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Authors and Affiliations

  1. Université Paris-Est, Laboratoire Géomatériaux et Environnement, EA 4508, UPEM, 5, Bd Descartes, 77454, Marne-la-Vallée, France

    Hugo Olvera-Vargas, Nihal Oturan & Mehmet A. Oturan

  2. School of Environmental Sciences, Mahatma Gandhi University, Kottayam, 686 560, India

    C. T. Aravindakumar & M. M. Sunil Paul

  3. Department of Environmental and Occupational Health, School of Public Health, Texas A&M University , 1266 TAMU, College Station, 77843, Texas, USA

    Virender K. Sharma

Authors
  1. Hugo Olvera-Vargas
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  2. Nihal Oturan
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  3. C. T. Aravindakumar
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  4. M. M. Sunil Paul
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  5. Virender K. Sharma
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  6. Mehmet A. Oturan
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Correspondence to C. T. Aravindakumar or Mehmet A. Oturan.

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Responsible editor: Philippe Garrigues

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Olvera-Vargas, H., Oturan, N., Aravindakumar, C.T. et al. Electro-oxidation of the dye azure B: kinetics, mechanism, and by-products. Environ Sci Pollut Res 21, 8379–8386 (2014). https://doi.org/10.1007/s11356-014-2772-4

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  • DOI: https://doi.org/10.1007/s11356-014-2772-4

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