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Characterization of a tropical soil and a waste from kaolin mining and their suitability as heterogeneous catalysts for Fenton and Fenton-like reactions

Published online by Cambridge University Press:  09 July 2018

M. C. Pereira ,
C. M. Tavares ,
J. D. Fabris ,
R. M. Lago ,
E. Murad  and
P. S. Criscuolo
M. C. Pereira
Affiliation:
Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, Minas Gerais, Brazil
C. M. Tavares
Affiliation:
Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, Minas Gerais, Brazil
J. D. Fabris*
Affiliation:
Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, Minas Gerais, Brazil
R. M. Lago
Affiliation:
Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, Minas Gerais, Brazil
E. Murad
Affiliation:
Departamento de Química, ICEx, Universidade Federal de Minas Gerais, 31270-901 Belo Horizonte, Minas Gerais, Brazil Bayerisches Landesamt für Umwelt, Dienststelle Marktredwitz, D-95603 Marktredwitz, Germany
P. S. Criscuolo
Affiliation:
Centro de Desenvolvimento Mineral, Companhia Vale do Rio Doce, 33040-900 Santa Luzia, Minas Gerais, Brazil
*
*E-mail: jdfabris@ufmg.br
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Abstract

Alternative Fenton and Fenton-like systems based on natural Fe oxides are described. The collected materials were modified through controlled reduction with H2 and were characterized by chemical analysis, X-ray diffraction, saturation magnetization measurements, and Mössbauer spectroscopy at 298 and 110 K. The catalytic activities of these original and modified materials were tested by studying the decomposition of H2O2 and the discolouration of methylene blue. Iron oxides present in the samples were mainly hematite and subordinate goethite which, after controlled reduction, were converted to metallic iron and magnetite. The mixture of Fe0 and magnetite in one of these materials was significantly more efficient at H2O2 decomposition and the discolouration of methylene blue than the original Fe3+ oxides. These results suggest that Fe2+ is essential to produce an active Fenton system.

Keywords

soilkaolinFe oxidescatalysisFenton's reagentreductionXRDMössbauer spectroscopymagnetization
Type
Research Article
Information
Clay Minerals , Volume 42 , Issue 3 , September 2007 , pp. 299 - 306
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2007

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