Electrochemical Degradation of Acid Yellow 23 by Anodic Oxidation—Optimization of Operating Parameters
Publication: Journal of Environmental Engineering
Volume 142, Issue 11
Abstract
In this study, the electrochemical oxidation (EO) process was implemented and optimized to effectively decolorize and degrade wastewater containing Acid Yellow 23 (Y23). The experiments were carried out in a laboratory-scale batch cell reactor, with monopolar configuration of electrodes, made of graphite (anode) and titanium (cathode). The response surface methodology (RSM), coupled with Box-Behnken experimental design (BBD), was used to evaluate the single and interactive effects of different variables of the EO process on (1) degradation percentages of both chemical oxygen demand (%DCOD) and color (%DC) and (2) energy consumption (EC). Thus, the following experimental factors were considered: initial dye concentration (), current density (), and conductivity (). Thus, the subsequent conditions were found to be optimal for decolorization and degradation of Y23: initial dye concentration = ; current density = ; and conductivity = . At these conditions, the EO process allowed to reach approximately 99% of color degradation and 76% of COD degradation. Because NaCl was used as an electrolyte, chorine formation was monitored, and its effect on %DC and %DCOD was also evaluated.
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Acknowledgments
The authors thank the Dirección de Investigación de la Universidad EAFIT, Medellin, Colombia, for its financial support of this research. The staff of the Laboratorio de Ingeniería de Procesos is also recognized for its participation.
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Published In
Journal of Environmental Engineering
Volume 142 • Issue 11 • November 2016
Copyright
© 2016 American Society of Civil Engineers.
History
Received: Sep 28, 2015
Accepted: Feb 10, 2016
Published online: May 6, 2016
Discussion open until: Oct 6, 2016
Published in print: Nov 1, 2016
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