Materiais nanométricos de dióxido de estanho (SnO2) modificados com ferro: síntese e avaliação dopotencial catalíitico em processos de oxidação do corante orgânico rodamina B

Abstract

The discharges of industrial waste have become a serious environmental problem because of its diverse composition and toxicity which hampers the removal by conventional treatment processes, in particular the waste from the textile industry that besides toxic, they are characterized by intense staining. Aimed at removing these dyes, was held in this study, a tin dioxide doping with 0,10%, 0,15% and 0,20% of iron in order to evaluate the catalytic potential of pure oxide, compared to doped materials, in the removal of color solutions containing the organic dye rhodamine B as template molecule. The synthesized materials were characterized by SEM –EDS, X-ray diffraction, X-ray fluorescence and diffuse reflectance. The solutions containing the template molecule were placed in a photoreactor with ultraviolet light and monitored by UV-Vis, every 30 minutes. To check the optimal reaction condition, were tested different amounts of catalysts, concentrations of peroxide and rhodamine B. It was observed that the material containing 0.10 % to 0.15 % iron obtained more satisfactory results, removing, approximately 60 % of the color in 120 minutes of reaction.