Journal
CATALYSIS COMMUNICATIONS
Volume 8, Issue 12, Pages 2037-2042Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.catcom.2007.03.030
Keywords
hydrogen peroxide decomposition; template method; manganese ferrite spinel; nanoparticle; heterogeneous Fenton reaction
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Spinel ferrite MnFe2O4 nanoparticles were synthesized by means of a nanocasting technique using a low-cost mesoporous silica gel as a hard template. The magnetic nanoparticles, of <10 nm diameter and with a surface area of around 100 m(2)/g, were tested as a heterogeneous Fenton catalyst for the decomposition of hydrogen peroxide under neutral and basic conditions. This catalyst shows a much higher activity than previous heterogeneous catalysts reported in the literature, which is mainly ascribed to its small particle size. Furthermore, the magnetic catalyst can be easily separated from the reaction medium by means of an external magnetic field. The effects of residual silica and the purity of the catalyst (hematite formation) on catalytic activity have been studied and correlated. The results obtained show this catalyst to be a suitable candidate for the removal of pollutants in wastewaters by means of the Fenton heterogeneous reaction. (C) 2007 Elsevier B.V. All rights reserved.
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