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Depollution of indigo dye by anodic oxidation and electro-Fenton using B-doped diamond anode

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Abstract

Hazardous wastes are generated in the synthesis of dyes and pigments applied in industries. Efficient methods are thus needed to clean wastewaters. Here, we use anodic oxidation and electro-Fenton with B-doped diamond anode to degrade the synthetic dye indigo in aqueous sodium dithionite. Results show the near-complete mineralization of the dye within 80 min at 500 mA. Mineralization was faster by electro-Fenton than anodic oxidation. The second-order rate constant (k) for the reaction of indigo with ·OH was measured as 4.03 × 109 M−1 s−1 at pH 3.0 and was compared with the rate constants of reactions between dyes and ·OH. The results clearly demonstrate that both electro-Fenton and anodic oxidation can be used to depollute dyes in textile effluent with high efficiency and low cost. The main oxidant, ·OH, being a non-selective reagent, the method could be applied to degrade other organic pollutants.

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Authors and Affiliations

  1. Laboratoire Géomatériaux et Environnement, Université Paris-Est, EA 4508, UPEMLV, 77454, Marne-la-Vallée, France

    Mababa Diagne, Nihal Oturan & Mehmet A. Oturan

  2. Faculté´ des Sciences et Techniques, Institut des Sciences de la Terre, Université Cheikh Anta Diop, BP 5396, Dakar-Fann, Dakar, Senegal

    Mababa Diagne

  3. Department of Chemistry and Center of Ferrate Excellence, Florida Institute of Technology, Melbourne, FL, 32901, USA

    Virender K. Sharma

Authors
  1. Mababa Diagne
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  2. Virender K. Sharma
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  3. Nihal Oturan
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  4. Mehmet A. Oturan
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Correspondence to Mehmet A. Oturan.

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Diagne, M., Sharma, V.K., Oturan, N. et al. Depollution of indigo dye by anodic oxidation and electro-Fenton using B-doped diamond anode. Environ Chem Lett 12, 219–224 (2014). https://doi.org/10.1007/s10311-013-0437-z

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  • DOI: https://doi.org/10.1007/s10311-013-0437-z

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