|
Abstract
|
tIn this work, degradation of C.I. Acid Red 33 (AR33) in aqueous solutions was investigated. The combinedelectrolysis–ozone (ECO) process optimized based on SnO2nanoparticles electrode (nano-SnO2/Ti) as anode usingresponse surface methodology (RSM) involving a five-level central composite design (CCD). The nano-SnO2/Ti elec-trode was prepared using electrophoretic deposition (EPD) method. The electrode was characterized by field emissionscanning electron microscopy (FE-SEM), X-ray diffraction (XRD) and cyclic voltammetry (CV). The initial pH, currentdensity, reaction time and electrolyte concentration were selected as independent variables in central compos-ite design while color removal efficiency was considered as the response function. Based on analysis of variance(ANOVA), the coefficient of determination value (R2= 0.981) was high. In optimum conditions, maximum color removalefficiency (93.2%) was obtained after 16 min; and the removal of chemical oxygen demand (COD) was reduced to 57.1%after 60 min.
|