Statistical optimization of Reactive Red 141 removal by heterogeneous photo–Fenton reaction using ZnFe2O4 oxide prepared by microwave irradiation

AbstractA statistical optimization of Reactive Red 141 (RR141) removal by heterogeneous photo–Fenton reaction using ZnFe2O4 particles was performed. ZnFe2O4 oxide was synthesized by microwave-assisted solvothermal route and characterized by X–ray diffraction, Fourier transform infrared spectroscopy, and N2 adsorption–desorption isotherms. This material was used as a catalyst for the removal of RR141 dye from aqueous solution. Statistical optimization for the RR141 removal was performed using a 24−1 fractional experimental design, followed by the response surface methodology. Effects of pH, reaction time, dye concentration, and H2O2 concentration were evaluated. ZnFe2O4 particles presented a mesoporous structure with surface area of 65 m2 g−1. It was found that the more adequate conditions for the RR141 dye removal were pH 2.0, reaction time of 60 min, dye concentration of 60 mg L−1, and H2O2 concentration of 10 mM. In these conditions, 90% of color removal was achieved. The results demonstrate that the Zn...