The influence of different variables in the photoelectro-Fenton process for the decolorization of Orange II was investigated using an experimental design methodology. The variables considered in this study include electrical current, Fe3+ concentration, H2O2 concentration and initial pH. Response factors were decolorization efficiencies after 30, 90 and 120 min of reaction time, for an initial dye concentration of 100 mg/L. The positive and negative effects of variables and the interaction between variables on color removal were determined. The response surface methodology models were derived based on the decolorization efficiency results and the response surface plots were developed accordingly.
Keywords: central composite design, decolorization, Orange II, photoelectro-Fenton, response surface methodology