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<p>The electrochemical degradation of reactive blue 21 (RB21) was investigated using anodic oxidation on a platinum (Pt) electrode in a basic medium (0.1&#xa0;M NaOH). Cyclic voltammetry revealed the influence of dye concentration and potential scan rate on RB21’s electrochemical behavior over a potential range of -1 to 0.8&#xa0;V/SCE. Electrolysis experiments performed by chronopotentiometry showed that increasing current density and electrolysis time significantly enhanced decolorization. Under optimal conditions, a current density of 100&#xa0;mA&#xa0;cm⁻<sup>2</sup> and an electrolysis time of 180&#xa0;min at 25&#xa0;°C resulted in 99.6% dye removal efficiency. Mass spectrometry analysis identified intermediate degradation products, allowing the proposal of a possible degradation pathway. These results demonstrate the effectiveness of anodic oxidation in alkaline media for efficient dye decolorization and the breakdown of complex dye structures.</p> Graphical abstract <p></p>

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Wastewater Treatment for Textile Dye Decolorization Using Anodic Oxidation with a Platinum Electrode in a Basic Medium

  • 期刊论文

  • 发表日期：

    2025年6月24日

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  • Sanaa El Aggadi,
  • Jamila El Karkouri,
  • Mariem Ennouhi,
  • Redouane Khaoulaf,
  • Mohammed Radouane Kriem

摘要

The electrochemical degradation of reactive blue 21 (RB21) was investigated using anodic oxidation on a platinum (Pt) electrode in a basic medium (0.1 M NaOH). Cyclic voltammetry revealed the influence of dye concentration and potential scan rate on RB21’s electrochemical behavior over a potential range of -1 to 0.8 V/SCE. Electrolysis experiments performed by chronopotentiometry showed that increasing current density and electrolysis time significantly enhanced decolorization. Under optimal conditions, a current density of 100 mA cm⁻2 and an electrolysis time of 180 min at 25 °C resulted in 99.6% dye removal efficiency. Mass spectrometry analysis identified intermediate degradation products, allowing the proposal of a possible degradation pathway. These results demonstrate the effectiveness of anodic oxidation in alkaline media for efficient dye decolorization and the breakdown of complex dye structures.

Graphical abstract