Electrochemical degradation of the dye indigo carmine at boron-doped diamond anode for wastewaters remediation |
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Authors: | Salah Ammar Ridha Abdelhedi Cristina Flox Conchita Arias Enric Brillas |
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Institution: | (1) UR Electrochimie et Environment, Ecole Nationale d’Ingénieurs de Sfax, BPW 3038 Sfax, Tunisie;(2) LCTEM, Departament de Química Física, Facultat de Química, Universitat de Barcelona, 08028 Barcelona, Spain |
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Abstract: | Here we demonstrate that anodic oxidation with a boron-doped diamond (BDD) electrode can be applied to the remediation of wastewaters containing indigo carmine. This environmentally friendly method decontaminates completely acid and alkaline aqueous solutions of this dye. The degradation rate increases with increasing current and dye concentration. Indigo carmine is more rapidly removed in alkaline than in acid medium, but its kinetics does not follow a defined reaction order. Isatin 5-sulfonic acid is the main aromatic product formed. Oxalic and oxamic acids are generated as ultimate carboxylic acids. The nitrogen of the dye is converted into NH4
+ and NO3
−. |
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Keywords: | Indigo carmine Anodic oxidation Boron-doped diamond electrode Mineralization |
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