Abstract
Samples of Ni-doped goethites were prepared and characterized by Mössbauer spectroscopy, IV, XRD, TPR and BET surface area measurements. Mössbauer data evidenced the incorporation of Ni 2+ in the goethite structure, and this cation-doping caused a significant decrease of the chemical reduction temperature in the TPR process. The catalytic behavior of these Fe 1− x Ni x OOH materials was investigated for the H 2O 2 decomposition to O 2 and the oxidation of quinoline. The successive hydroxylation of quinoline during this oxidation strongly suggests that highly reactive hydroxyl radicals are generated during the reaction involving H 2O 2 on the Ni-goethite grain surface, also confirming that these materials are efficient heterogeneous Fenton catalysts.
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