Application of TiO2 nanoparticle for solar photocatalytic oxidation system

The main purpose of this study is to optimize the applicability of TiO2 nanoparticles for paper mill and pulp wastewater treatment under solar irradiation using response surface methodology, provided by the software package DOE. The principle independent parameters were TiO2 loading, pH, time and H2O2 concentration, and COD removal efficiency was chosen as desire response. To evaluate the influence of the parameters on the outputs, the quadratic formulation was applied and for determining the validation of developed models analysis of variance was utilized. The results represented the greatest COD removal was achieved 82%, approximately at pH of 8.1, TiO2 fraction of 0.83 g/L, H2O2 concentration of 2.4 ml/L and the contact time of 196 min.