Electrochemical incineration of indigo textile dye in filter-press-type FM01-LC electrochemical cell using BDD electrodes

Edgar Butrón, Manuel E. Juárez, Myrna Solis, Margarita Teutli, Ignacio González, José L. Nava

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75 Scopus citations

Abstract

This work shows results obtained in the incineration of 1 mM indigo textile dye (536 ppm COD) in 0.05 M NaCl aqueous media (which resembles a denim laundry industrial wastewater). Microelectrolysis and macroelectrolysis studies indicated that oxidation of indigo dye was carried out via hydroxyl radicals (OH{radical dot}) formed by water oxidation on the BDD surface, instead of active chlorine as usually occurs by using DSA. Electrolyses in a FM01-LC reactor was performed at Reynolds between 1600 < Re < 18300, and a fixed current density of 5.3 and 15 mA cm-2. The experimental set-up achieved 100% efficiency in color removal, indigo mineralization and current efficiency. Estimated energy consumption, at Re = 12892 and J = 5.3 mA cm-2, was 9 kWh m-3. Experimental data revealed that hydrodynamic conditions do not influence either the indigo degradation rate or the current efficiencies; therefore indigo degradation must involve a complex mechanism.

Original languageEnglish
Pages (from-to)6888-6894
Number of pages7
JournalElectrochimica Acta
Volume52
Issue number24
DOIs
StatePublished - 1 Aug 2007

Keywords

  • BDD electrodes
  • Degradation of organics
  • Denim wastewater
  • FM01-LC reactor
  • Indigo dye

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