Application of a novel definitive screening design to decolorization of an azo dye on boron-doped diamond electrodes

M. Fidaleo, R. Lavecchia, E. Petrucci, A. Zuorro

Research output: Contribution to journalArticlepeer-review

Abstract

The electrochemical decolorization of the Reactive Violet 5 azo dye on a boron-doped diamond anode was used as a model process to test a novel definitive screening design (DSD). This method allows a dramatic reduction in the number of experiments needed to investigate those systems characterized by a large number of variables. In this study, the effect of nine quantitative parameters was investigated: initial dye concentration (60–120 mg L−1), current density (100–500 A m−2), NaCl concentration (5–20 mM), Na2SO4 concentration (35–65 mM), pH (3–11), temperature (20–45 °C), inter-electrode distance (0.5–3.5 cm), stirring rate (250–750 rpm) and electrolysis time (2–8 min). Analysis of DSD data showed that four out of the nine factors (initial dye concentration, current density, pH and electrolysis time) were statistically significant. These factors were retained for process characterization using a subsequent central composite design. Overall, the number of experiments was reduced from over 500 to only 41, thus confirming the validity of the proposed approach as a time-saving and efficient method.

Original languageEnglish
Pages (from-to)835-842
Number of pages8
JournalInternational Journal of Environmental Science and Technology
Volume13
Issue number3
DOIs
Publication statusPublished - Mar 1 2016
Externally publishedYes

Keywords

  • Boron-doped diamond electrode
  • Central composite design
  • Color removal
  • Definitive screening design
  • Reactive Violet 5

ASJC Scopus subject areas

  • Agricultural and Biological Sciences(all)
  • Environmental Chemistry
  • Environmental Engineering

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