Statistical optimization of Reactive Red 141 removal by heterogeneous photo–Fenton reaction using ZnFe2O4oxide prepared by microwave irradiation

Abstract

A 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 ZnFe2O4 oxide is an efficient catalyst for the removal of RR141dye from aqueous solution through the heterogeneous photo–Fenton reaction.