Study of the degradation of RY-145 b y the fenton process using a prepared magnetic bentonite as heterogeneous catalyst

Abstract

The present investigation sets out to describe the potential of magnetite (Fe₃O₄) impregnated bentonite (BE-Fe₃O₄) to assist in the Fenton process. Utilizing the Co-precipitation method, the BE-Fe₃O₄ samples were developed as a catalyst for the degradation of RY-145 dye in an aqueous environment. The BE-Fe₃O₄ were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), scanning electron microscopy (SEM) and energy dispersive X-ray spectroscopy (EDX). The effects of solution pH, the concentration of H₂O₂ solution, the mass of the catalyst, and the concentration of RY-145 dye on the degradation efficiency were evaluated for parametric optimization. The degradation of the dye was most favorable at an acid pH of 2, H₂O₂ concentration of 1.5 mol/L, 100 mg of the catalyst and the initial RY-145 concentration of 100 mg/L. The pristine and modified clays were morphologically distinguishable, and XRD analyses confirmed the formation of Fe₃O₄ particles. The minimum degradation percentage above 92 %, irrespective of the process conditions. RY-145 degradation dynamics on BE-Fe₃O₄ followed second-order kinetic law. After five cycles of evaluation of BE-Fe₃O₄'s stability and efficiency, it was discovered that the material lost about 13 % of its efficiency. This research demonstrated that the catalyst obtained from BE-Fe₃O₄ could be used in the treatment technology of wastewater containing RY-145 b y Fenton process.