Abstract
The study of the Congo red dye adsorption was performed using LaMnO3 and LaNiO3 perovskites-type obtained by mechanosynthesis. The synthesized perovskites were characterized by thermogravimetric analysis, Fourier Transform Infrared (FTIR) absorption spectroscopy, X ray diffraction patterns (XRD) and N2 adsorption at −196 °C. The adsorption efficiency of the perovskites in the Congo red adsorption was evaluated. The nickel-based sample showed a maximum adsorption efficiency of 48%, while the manganese-based material showed a maximum efficiency of 73%. Kinetic studies showed that the pseudo-second order model was the most appropriate to describe the experimental values, as it showed R2 values closer to the unit. It was possible to recover the adsorbent that could be reused after the adsorption assays.
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