Journal
ENVIRONMENTAL CHEMISTRY LETTERS
Volume 4, Issue 4, Pages 229-233Publisher
SPRINGER HEIDELBERG
DOI: 10.1007/s10311-006-0053-2
Keywords
indigo carmine; anodic oxidation; boron-doped diamond electrode; mineralization
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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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