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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 |
Aparece nas coleções: | Artigos |
Arquivos associados a este item:
Arquivo | Descrição | Tamanho | Formato | |
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artigo.pdf Until 2100-12-31 | texto completo | 1,65 MB | Adobe PDF | Visualizar/Abrir ACESSO RESTRITO |
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