Abstract
In this work materials based on iron oxide dispersed over activated carbon were prepared and tested in the H 2O 2 decomposition and removal of the methylene blue (MB) model from aqueous solution. Two different supports were evaluated: a commercial activated carbon (CAC) and an activated carbon produced by coffee used grounds (ACK). These materials, after iron impregnation (CAC/Fe and ACK/Fe), were characterized using XRD, SEM, N 2-sorption, XPS and Mössbauer spectroscopy. The main results suggest the formation of composites with high surface area and iron dispersion containing Fe 3+ on the surface of both catalysts. Catalytic tests revealed high capacity for H 2O 2 decomposition by both composites with more activity for ACK/Fe. MB removal experiments showed intense removal of the model through combined adsorption and oxidation processes. The detection of known MB oxidation intermediates observed by ESI-MS studies confirmed the occurrence of MB oxidation processes and also showed more activity for ACK/Fe.
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