Abstract：
:In this work a novel heterogeneous Fenton system based on Fe(0)/Fe3O4 composites is described. The composites with several Fe(0)/Fe3O4 ratios were prepared by two different methods, i.e. mechanical alloying of Fe(0) and Fe3O4 powders and controlled reduction of Fe3O4 with H2. Reaction studies and detailed Conversion Electron Mössbauer surface characterization of the composites Fe(0)/Fe3O4, Fe(0), Fe3O4, alpha-Fe2O3 and gamma-Fe2O3 suggested that Fe2+surf species are essential to produce an active Fenton system. Kinetic studies for the oxidation of the dye methylene blue, used as an organic model molecule, and for the peroxide decomposition suggest that the reactions proceed via HO* radicals generated from Fe2+surf species and H2O2 in a Fenton like mechanism. The increase in activity caused by the addition of Fe(0) is discussed in terms of a creation of Fe2+surf species during the preparation of the composite and by an electron transfer mechanism from Fe(0) to Fe3+surf during the Fenton reaction to regenerate the Fe2+surf active species.
journal_name
Chemospherejournal_title
Chemosphereauthors
Moura FC,Araujo MH,Costa RC,Fabris JD,Ardisson JD,Macedo WA,Lago RMdoi
10.1016/j.chemosphere.2004.12.076subject
Has Abstractpub_date
2005-08-01 00:00:00pages
1118-23issue
8eissn
0045-6535issn
1879-1298pii
S0045-6535(05)00071-8journal_volume
60pub_type
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