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Screening Refractory Dye Degradation by Different Advanced Oxidation Processes.

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Summary

Electro-Fenton (EF) and anodic oxidation (AO) effectively degrade Rhodamine B (RhB) dye. The combined EF/AO process demonstrated superior mineralization and toxicity reduction, offering sustainable wastewater treatment solutions.

Keywords:
anodic oxidationcoupling processecotoxicityelectro-Fentonelectrochemical advanced oxidation processesmineralizationrhodamine B degradation pathways

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Area of Science:

  • Environmental Chemistry
  • Electrochemistry
  • Water Treatment

Background:

  • Rhodamine B (RhB) is a persistent organic pollutant found in textile wastewater.
  • Effective degradation methods are crucial for mitigating environmental pollution from dyes.

Purpose of the Study:

  • To investigate the degradation of Rhodamine B (RhB) using electro-Fenton (EF), anodic oxidation (AO), and a combined EF/AO process.
  • To evaluate the influence of operational parameters on degradation efficiency and mineralization.
  • To assess the toxicity reduction and mineralization pathways of RhB during electrochemical treatment.

Main Methods:

  • Electrochemical degradation using carbon felt cathodes and Ti4O7 or Ti/Pt anodes.
  • Optimization of current density and assessment of RhB concentration effects.
  • Toxicity assessment using Microtox® bioluminescence inhibition test.
  • Mineralization analysis via total organic carbon (TOC) removal.
  • Degradation pathway elucidation using high-resolution mass spectrometry.

Main Results:

  • Optimal current density for RhB degradation was 30 mA cm⁻², balancing efficiency and energy consumption.
  • The combined EF/AO process achieved 90% TOC removal at pH 3, indicating superior mineralization.
  • Electrochemical treatment significantly reduced the toxicity of RhB solutions, with EF/AO showing the highest reduction.
  • Degradation pathways involved chain oxidation reactions, leading to mineralization into CO2 and H2O.

Conclusions:

  • EF, AO, and EF/AO are effective electrochemical methods for Rhodamine B degradation and mineralization.
  • The combined EF/AO process offers a promising approach for sustainable and eco-friendly wastewater treatment.
  • Optimized electrochemical processes can efficiently remove persistent organic pollutants and reduce their toxicity.