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
| Autor: | Hanane Afanga, Fatima Ezzahra Titchou, El Gaayda Jamila, Mehmet A. Oturan, Hicham Zazou, Mohamed Hamdani, Rachid Ait Akbour |
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| Přispěvatelé: | Laboratoire Géomatériaux et Environnement (LGE ), Université Gustave Eiffel |
| Rok vydání: | 2021 |
| Předmět: |
inorganic chemicals
Total organic carbon [SDE.IE]Environmental Sciences/Environmental Engineering Supporting electrolyte Sulfates Mineralization (soil science) Hydrogen Peroxide Biochemistry Chloride chemistry.chemical_compound chemistry Wastewater Chlorides medicine Sewage treatment Anilides Irradiation Sulfate Azo Compounds Oxidation-Reduction ComputingMilieux_MISCELLANEOUS Water Pollutants Chemical General Environmental Science Nuclear chemistry medicine.drug |
| Zdroj: | Environmental Research Environmental Research, Elsevier, 2022, 204, pp.112353. ⟨10.1016/j.envres.2021.112353⟩ |
| ISSN: | 1096-0953 0013-9351 |
| Popis: | 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 a 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 |
| Databáze: | OpenAIRE |
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