Obtenção de fotocatalisadores heterogêneos a partir de rejeito da mineração de ferro e sua aplicação na degradação do 17 α-etinilestradiol

Abstract

The crude iron tailings (RS) and thermally treated ore at 660 and 860 °C, RS660 and RS860 respectively, were used as catalyst for of photocatalysis and photo Fenton reactions of the 17 α-ethynylestradiol hormone. The treatment of the tailings was done by thermal reduction at 660 and 860 ° C under H2 / N2 atmosphere. The materials were characterized by thermogravimetric analysis (TGA), X-Ray diffraction (XRD), Mössbauer spectroscopy to identify the iron phases in the materials. For RS phases of hematite and goethite were found, while for RS660 and RS860 the iron phases are magnetite and FeO. The images from scanning electron microscopy (SEM) were used to evaluate the morphology of the materials. The photocatalysis were carried for 8 hours while the photo Fenton reaction were carried for 6 hours. The RS660 have shown more efficiency than the other catalysts for photocatalysis with 65,73% of degradation. However, RS860 were the best catalyst for Fenton and photo Fenton reaction with 73,91% and 81,80% of degradation respectively. The RS did not show a significant difference for the hormone degradation in both reactions and we could notice a decrease in the Fenton degradation.