Use este identificador para citar ou linkar para este item: https://locus.ufv.br//handle/123456789/19161
Tipo: Artigo
Título: Controlled formation of reactive Fe particles dispersed in a carbon matrix active for the oxidation of aqueous contaminants with H2O2
Autor(es): Tristão, Juliana Cristina
Mendonça, Fernanda Gomes de
Lago, Rochel Montero
Ardisson, José Domingos
Abstract: 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 Fe3O4 particles, while treatments at higher temperatures, i.e., 600 and 800 °C, produced phases such as Fe0 and Fe3C. The composites were tested for the oxidation of methylene blue with H2O2 by a Fenton-type reaction and also H2O2 decomposition, 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 Fe3O4 nanoparticles active for the Fenton reaction.
Palavras-chave: Magnetic nanoparticles
Iron oxides
Iron nanoparticles
Carbon matrix
Sucrose
Heterogeneous
Fenton
Editor: Environmental Science and Pollution Research
Tipo de Acesso: Springer-Verlag Berlin Heidelberg
URI: https://link.springer.com/article/10.1007%2Fs11356-014-2554-z
http://www.locus.ufv.br/handle/123456789/19161
Data do documento: 12-Jan-2014
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