Treatment of an azo dye effluent by peroxi-coagulation and its comparison to traditional electrochemical advanced processes

Peroxi-coagulation (PC) is an interesting new process that has not been widely studied in the literature. This work presents the application of this technology to treat an azo dye synthetic effluent, studying the effect of different parameters including initial pH, current density (j), initial dye c...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2018-08, Vol.204, p.548-555
Main Authors: do Vale-Júnior, Edilson, da Silva, Djalma R., Fajardo, Ana S., Martínez-Huitle, Carlos A.
Format: Article
Language:English
Subjects:
Air diffusion cathode
Boron doped diamond
Methyl orange dye
Peroxi-coagulation
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Summary:Peroxi-coagulation (PC) is an interesting new process that has not been widely studied in the literature. This work presents the application of this technology to treat an azo dye synthetic effluent, studying the effect of different parameters including initial pH, current density (j), initial dye concentration and supporting electrolyte. The two former variables significantly affected the colour removal of the wastewater, followed by the initial dye concentration and the kind of electrolyte, in a lesser extent. The optimum operating conditions achieved were initial pH of 3.0, j = 33.3 mA cm−2, 100 mg L−1 of methyl orange (MO) and Na2SO4 as supporting electrolyte. The performance of PC was also compared to other electrochemical advanced processes, under similar experimental conditions. Results indicate that the kinetic decay of the MO increases in the following order: electrocoagulation (EC) 
ISSN:0045-6535
1879-1298
DOI:10.1016/j.chemosphere.2018.04.007