Síntese e caracterização de compósito carbonáceo de magnetita para aplicação como fotocalisador

Abstract

In the present work a carbonaceous composite of magnetite obtained from the coconut ariri biomass was prepared by the wet impregnation method with iron chloride III for the degradation of the rhodamine B. The composite was characterized by X-Ray Diffraction), Fourier Transform Infrared Spectroscopy (FTIR), Scanning Electron Microscopy (SEM), X-ray energy dispersion spectroscopy (EDX), Raman Spectroscopy and Thermogravimetric analysis of biomass. The obtained compound presented magnetic characteristics, where such property facilitates the removal of the material in a reaction mixture. With the XRD technique, one can observe the presence of phases referring to a carbonaceous material with phase of magnetite. The infrared spectra confirmed the presence of the vibrations of the main bonds present in the in natura biomass and the obtained composite. The micrographs illustrated a heterogeneous material. The EDX technique shows that the composite is composed primarily of carbon, iron, and oxygen. The RAMAN spectroscopy demonstrates that the composite obtained has characteristics of carbonaceous compound. In the thermal analysis of the biomass, it was observed the main losses of mass, referring to the decomposition of the lignino-cellulosic material, as well as the influence of iron chloride. After characterizing this carbonaceous compound was applied in the degradation of rhodamine B, where the photocatalytic activity was evaluated by light irradiation in rhodamine solution. The photodegradation of the organic dye reached 80% in maximum time of 140 min light irradiation.