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- Title
Depollution of indigo dye by anodic oxidation and electro-Fenton using B-doped diamond anode.
- Authors
Diagne, Mababa; Sharma, Virender; Oturan, Nihal; Oturan, Mehmet
- Abstract
Hazardous wastes are generated in the synthesis of dyes and pigments applied in industries. Efficient methods are thus needed to clean wastewaters. Here, we use anodic oxidation and electro-Fenton with B-doped diamond anode to degrade the synthetic dye indigo in aqueous sodium dithionite. Results show the near-complete mineralization of the dye within 80 min at 500 mA. Mineralization was faster by electro-Fenton than anodic oxidation. The second-order rate constant ( k) for the reaction of indigo with OH was measured as 4.03 × 10 M s at pH 3.0 and was compared with the rate constants of reactions between dyes and OH. The results clearly demonstrate that both electro-Fenton and anodic oxidation can be used to depollute dyes in textile effluent with high efficiency and low cost. The main oxidant, OH, being a non-selective reagent, the method could be applied to degrade other organic pollutants.
- Subjects
ELECTROLYTIC oxidation; DYES &; dyeing &; the environment; DYES &; dyeing; SEWAGE oxidation; POLLUTANTS
- Publication
Environmental Chemistry Letters, 2014, Vol 12, Issue 1, p219
- ISSN
1610-3653
- Publication type
Article
- DOI
10.1007/s10311-013-0437-z