Abstract
This work discusses the decolorization and degradation of textile azo dye solutions containing Acid Yellow 36 (AY-36) by the electro-Fenton process (EF) using an undivided electrochemical cell containing a boron doped diamond (BDD) electrode as cathode for H 2O 2 production. The independent parameters of current density, dye concentration, Fe 2 + concentration and electrolysis time in the range of 8–23 mA/cm 2, 60–80 mg/L, 0.1–0.3 mM and 10–50 min, respectively, were evaluated. Experimental data were optimized by means of a 2 4 factorial design and Response Surface Methodology (RSM). These results revealed that the optimal operating conditions to achieve 95.9% efficiency for dye decolorization with complete degradation were current density = 15 mA/cm 2, AY-36 concentration = 80 mg/L, Fe 2 + content = 0.3 mM and electrolysis time = 50 min. This was confirmed with UV–vis and HPLC assessments during the EF/BDD treatment.
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