INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
artículos
Título:
The Heterogeneous Photo-Fenton Reaction Using Goethite as Catalyst
Autor/es:
ORTIZ DE LA PLATA, G.; ALFANO, O.M.; CASSANO, A.E.
Revista:
WATER SCIENCE AND TECHNOLOGY
Editorial:
I W A PUBLISHING
Referencias:
Año: 2010 vol. 61 p. 3109 - 3116
ISSN:
0273-1223
Resumen:
In the
present work the degradation of 2-chlorophenol (2-CP) used as model compound,
applying the Heterogeneous photo-Fenton reaction, was studied. Small particles of
goethite or iron oxyhydroxide were used as a source of iron. The influence of
catalyst loading, radiation intensity and the molar ratio between hydrogen
peroxide and contaminant were examined. Improvement by illumination is highly
significant. During the progress of 2-CP degradation, the reaction shows an
unusual acceleration. This autocatalytic comportment, with stronger tendencies
at higher temperatures, implies a completely different behaviour from the one
typically expected. The autocatalytic performance is successfully explained by
the joint action of two factors: (i) the evolution of the available iron in the
homogeneous phase during the course of the reaction and (ii) the autocatalytic
contribution of some of the reaction intermediates in the iron cycle. The small
iron concentration leaching into the solution is produced by two typical liquid
medium solid goethite surface dissolution processes. A reaction mechanism has
been proposed and, in a first stage, parameters have been obtained for the dark
reaction. In a second step, the complete data for the irradiated operation were
obtained.