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<p>This work aims to remove Methyl Violet 2B (MV2B) from aqueous solutions using a boron-doped diamond anode (BDD) and a stainless-steel cathode. For this reason, the impact of seven operational parameters on the efficiency of the MV2B degradation process was investigated, namely current density, supporting electrolyte concentration, initial pH, temperature, sodium chloride addition, flow rate, and initial dye concentration. All experiments were monitored using a UV-Visible spectrophotometer. According to this study, the electrochemical parameters analyzed have a significant impact on the performance of the examined electrochemical processes. At an initial concentration of 5 ppm, complete dye degradation was attained within 20&#xa0;min. Additionally, COD decreased by 72% under optimal operating conditions (0.5&#xa0;A/cm², 30 mM Na₂SO₄, pH 3, ambient temperature, 1 mM NaCl, and a flow rate of 300&#xa0;L/h). The activation energy value of about 11.49&#xa0;kJ·mol⁻¹ indicates that the degradation of MV2B on the BDD anode is predominantly governed by mass transfer. For all the parameters studied, the degradation kinetics can be described kinetically using a pseudo-first-order model, with an R² value approaching 1. In summary, anodic oxidation with a BDD anode proves to be an efficient method for degrading MV2B in aqueous solution.</p>

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Electrochemical degradation of the Methyl Violet 2B by hydroxyl radicals generated at a BDD anode

  • 期刊论文

  • 发表日期：

    2025年12月16日

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  • Rahma Benyahia,
  • Ilhem Ghodbane,
  • Fatiha Benamia,
  • Davide Clematis,
  • Marco Panizza

摘要

This work aims to remove Methyl Violet 2B (MV2B) from aqueous solutions using a boron-doped diamond anode (BDD) and a stainless-steel cathode. For this reason, the impact of seven operational parameters on the efficiency of the MV2B degradation process was investigated, namely current density, supporting electrolyte concentration, initial pH, temperature, sodium chloride addition, flow rate, and initial dye concentration. All experiments were monitored using a UV-Visible spectrophotometer. According to this study, the electrochemical parameters analyzed have a significant impact on the performance of the examined electrochemical processes. At an initial concentration of 5 ppm, complete dye degradation was attained within 20 min. Additionally, COD decreased by 72% under optimal operating conditions (0.5 A/cm², 30 mM Na₂SO₄, pH 3, ambient temperature, 1 mM NaCl, and a flow rate of 300 L/h). The activation energy value of about 11.49 kJ·mol⁻¹ indicates that the degradation of MV2B on the BDD anode is predominantly governed by mass transfer. For all the parameters studied, the degradation kinetics can be described kinetically using a pseudo-first-order model, with an R² value approaching 1. In summary, anodic oxidation with a BDD anode proves to be an efficient method for degrading MV2B in aqueous solution.