The efficiency of the catalysts
decreased in the sequence Fe2+
magnetite
≈
hematite > goethite.
Composites based on goethite supported on a silica matrix to
degrade phenol in the presence of H2O2 and oxalic acid. However,
the reactivity of this system to oxidize phenol was correlated with
dissolutive capacity of Fe by oxalic acid, and therefore homogeneous
Fenton take place