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Química Nova

Print version ISSN 0100-4042On-line version ISSN 1678-7064


GONCALVES, Maraísa; CASTRO, Cínthia Soares de; OLIVEIRA, Luiz C. A.  and  GUERREIRO, Mário César. Synthesis and characterization of iron oxide nanoparticles supported on carbon matrix: oxidation of the dye methylene blue in water. Quím. Nova [online]. 2009, vol.32, n.7, pp.1723-1726. ISSN 1678-7064.

In this work were prepared composites of iron oxide and carbonaceous materials in two different weight proportions (Carbon/Fe 1/1 and 1/2). The physico-chemical properties of the composites were determined by temperature programmed reduction (TPR), adsorption/dessorption of N2, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and pulse titration H2. The XRD and XPS analysis showed a cubic iron oxide phase, identified as maghemite, formed over the carbon surface. The particle size of maghemite showed to be within 10-30 nm. Carbon/Fe 1/2 was the most active in MB removal kinetics and ESI-MS studies showed that MB removal by both composites leads to oxidized intermediates.

Keywords : iron oxide; oxidation; nanoparticules.

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