Electrochemical oxidation of methyl orange azo dye at pilot flow plant using BDD technology

Cecilia Ramírez, Adriana Saldaña, Berenice Hernández, Roberto Acero, Ricardo Guerra, Sergi Garcia-Segura, Enric Brillas, Juan M. Peralta-Hernández

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

Solutions of methyl orange azo dye were degraded by electrochemical oxidation using a 3L flow plant with a boron-doped diamond (BDD)/stainless steel cell operating at constant current density, ambient temperature and liquid flow rate of 12Lmin-1. A 23 factorial design considering the applied current density, azo dye concentration and electrolysis time as variable independents was used to analyze the process by response surface methodology. LC-MS analysis revealed the formation of seven oxidation products from the cleavage of the NN group of the dye, followed by deamination, formation of a nitro group and/or desulfonation of the resulting aromatics.

Original languageEnglish (US)
Pages (from-to)571-579
Number of pages9
JournalJournal of Industrial and Engineering Chemistry
Volume19
Issue number2
DOIs
StatePublished - Mar 25 2013

Keywords

  • BDD
  • Electrochemical oxidation
  • Methyl orange
  • Oxidation products
  • Response surface methodology
  • Wastewater treatment

ASJC Scopus subject areas

  • Chemical Engineering(all)

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