Acid blue 29 decolorization and mineralization by anodic oxidation with a cold gas spray synthesized Sn–Cu–Sb alloy anode

The elevated cost of anodic materials used in the anodic oxidation for water treatment of effluents undermines the real application of these technologies. The study of novel alternative materials more affordable is required. In this work, we report the application of Sn–Cu–Sb alloys as cheap anodic...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2016-04, Vol.148, p.47-54
Main Authors: do Vale-Júnior, Edilson, Dosta, Sergi, Cano, Irene Garcia, Guilemany, Josep Maria, Garcia-Segura, Sergi, Martínez-Huitle, Carlos Alberto
Format: Article
Language:English
Subjects:
Alloys - chemistry
Azo Compounds - analysis
Coloring Agents - analysis
Dimensional stable anode
Dyes
Electrochemical oxidation
Electrochemistry
Electrodes
Electrolytes - chemistry
Naphthalenes - analysis
Oxidation-Reduction
Thermal projection
Wastewater treatment
Water Pollutants, Chemical - analysis
Water Purification - methods
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Summary:The elevated cost of anodic materials used in the anodic oxidation for water treatment of effluents undermines the real application of these technologies. The study of novel alternative materials more affordable is required. In this work, we report the application of Sn–Cu–Sb alloys as cheap anodic material to decolorize azo dye Acid Blue 29 solutions. These anodes have been synthesized by cold gas spray technologies. Almost complete decolorization and COD abatement were attained after 300 and 600 min of electrochemical treatment, respectively. The influence of several variables such as supporting electrolyte, pH, current density and initial pollutant concentration has been investigated. Furthermore, the release and evolution of by-products was followed by HPLC to better understand the oxidative power of Sn–Cu–Sb electrodes. •Stable and reproducible Sn–Cu–Sb anodes were synthesized by cold gas spray.•Almost complete decolorization is achieved by anodic oxidation in sulfate media.•Total COD abatement at low current densities of 10 mA cm-2 with Sn–Cu–Sb anodes.•Pollutant heteroatoms released mainly as sulfate, nitrate and ammonium.
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2016.01.015