Electrochemical Degradation of Acid Yellow 23 by Anodic OxidationOptimization of Operating Parameters
Por:
GilPavas, Edison, Dobrosz-Gomez, Izabela, Angel Gomez-Garcia, Miguel
Publicada:
1 nov 2016
Resumen:
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
(40-100mg/L), current density (10-20mA/cm2), and conductivity
(1,000-4,000S/cm). Thus, the subsequent conditions were found to be
optimal for decolorization and degradation of Y23: initial dye
concentration = 100mg/L; current density = 20mA/cm2; and conductivity =
4,000S/cm. 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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