Photocatalytic ozonation using Fe doped TiO2 nanoparticles for decolorization of azo dye Optimization using RSM

Abstract

Abstract The decolorization of azo dye was explored using Fe-doped titanium dioxide nanoparticles (FeT) UV radiation, and ozonation (UV/FeT/O3) process and process parameter are optimized using the most commonly used models of response surface methodology (RSM) viz. central composite design(CCD). The ozone concentration, initial pH, initial dye concentration, concentration of FeT catalyst, and decolorization efficiency as process response were investigated to develop a model using CCD. The developed regression model was statistically analyzed using Analysis of Variance (ANOVA). The value of the coefficient of determination (R2 = 0.9778) confirmed that the developed CCD model was statistically significant. The optimum decolorization efficiency of 95.12% for UV/FeT/O3 was achieved at ozone concentration = 70 mgL− 1; pH = 08; initial dye concentration = 200 mgL− 1; catalyst concentration = 1gL− 1. The photocatalytic ozonation process has a synergy index value of 1.12 between ozonation and photocatalysis.