Comparative study of the removal of direct red 23 by anodic oxidation, electro-Fenton, photo-anodic oxidation and photoelectro-Fenton in chloride and sulfate media

This study aims to compare the efficiency of anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF), and their association with UV irradiation (photo anodic oxidation (PAO), and photo electro-Fenton (PEF) for the removal of Direct Red 23 from wastewater using a BDD/carbon felt ce...

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Bibliographic Details
Published in:Environmental research 2022-03, Vol.204 (Pt D), p.112353-112353, Article 112353
Main Authors: Titchou, Fatima Ezzahra, Zazou, Hicham, Afanga, Hanane, Jamila, El Gaayda, Ait Akbour, Rachid, Hamdani, Mohamed, Oturan, Mehmet A.
Format: Article
Language:English
Subjects:
Anilides
Anodic oxidation
Azo Compounds
Chlorides
Direct red 23 dye
Electro-Fenton
Environmental Engineering
Environmental Sciences
Hydrogen Peroxide
Oxidation-Reduction
Photo-anodic oxidation
Photoelectro-Fenton
Sulfates
Wastewater treatment
Water Pollutants, Chemical - analysis
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Summary:This study aims to compare the efficiency of anodic oxidation with electrogenerated H2O2 (AO-H2O2), electro-Fenton (EF), and their association with UV irradiation (photo anodic oxidation (PAO), and photo electro-Fenton (PEF) for the removal of Direct Red 23 from wastewater using a BDD/carbon felt cell in chloride and sulfate medium and in their combination. The effect of the supporting electrolyte was investigated in AO-H2O2 and EF processes. High discoloration efficiency was obtained in chloride media while a higher mineralization rate was achieved in sulfate media. The EF process reached higher total organic carbon (TOC) removal efficiency than AO-H2O2. 90% TOC removal rate was achieved by the EF against 82% by AO-H2O2 in sulfate media. The influence of using the mixt supporting electrolyte formed of 75% Na2SO4 + 25% NaCl was found to have beneficial effect on TOC removal, achieving 89% and 97% by AO-H2O2 and EF, respectively. High currents led to higher mineralization rates while low currents yielded to a higher mineralization current efficiency (MCE%) and lower energy consumption (EC). UV irradiation enhanced process efficiency. Mineralization efficiency followed the sequence: AO-H2O2 
ISSN:0013-9351
1096-0953
DOI:10.1016/j.envres.2021.112353