Controlled formation of reactive Fe particles dispersed in a carbon matrix active for the oxidation of aqueous contaminants with H2O 2
2015
Tristão, Juliana Cristina | de Mendonça, Fernanda Gomes | Lago, Rochel Montero | Ardisson, José Domingos
In this work, reactive iron nanoparticles dispersed in a carbon matrix were produced by the controlled thermal decomposition of Fe³⁺ions in sucrose. During the sucrose decomposition, the Fe³⁺ions are reduced to form iron nanometric cores dispersed in a porous carbonaceous matrix. The materials were prepared with iron contents of 1, 4, and 8 wt.% and heated at 400, 600, and 800 °C. Analyses by X-ray diffraction, Mössbauer spectroscopy, magnetization measurements, Raman spectroscopy, termogravimetric analyses, BET surface area, scanning, and transmission electron microscopy showed that at 400 °C, the materials are composed essentially of Fe₃O₄particles, while treatments at higher temperatures, i.e., 600 and 800 °C, produced phases such as Fe⁰and Fe₃C. The composites were tested for the oxidation of methylene blue with H₂O₂by a Fenton-type reaction and also H₂O₂decomposition, showing better performance for the material containing 8 % of iron heated at 400 and 600 °C. These results are discussed in terms of Fe²⁺surface species in the Fe₃O₄nanoparticles active for the Fenton reaction.
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