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EXAFS study and photocatalytic properties of un-doped and iron-doped ZrO2-TiO2 (photo-) catalysts |
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| Authors: | M.C. Hidalgo, G. Col n, J.A. Navio, M. Macias, V.V. Kriventsov, D.I. Kochubey,M.V. Tsodikov |
| Affiliation: | aInstituto de Ciencia de Materiales de Sevilla, Centro Mixto CSIC-Universidad de Sevilla and Dpto. de Química Inorgánica, Universidad de Sevilla, Spain bBoreskov Institute of Catalysis, SB RAS, Lavrentyev prosp. 5, Novosibirsk 630090, Russia cA.V. Topchiev Institute of Petrochemical Synthesis, 29 Leninskii prosp., Moscow 117912, Russia |
| Abstract: | The local zirconium and iron arrangements of the iron-doped ZrO2-TiO2 system, prepared by sol–gel impregnation method, were studied by EXAFS spectroscopy. Only a tetragonal ZrO2 structure is located on TiO2 surface. For the iron-doped ZrO2-TiO2 system, the presence of the Fe-O-Fe species as well as and Fe-O-Zr species located on the surface/pre-surface region are shown; it seems that iron is heterogeneously distributed, forming small iron oxide nanoclusters and Fex/ZrO2 (tetragonal) spots at the catalyst surface. The photocatalytic activity of the un-doped and iron-doped binary system ZrO2-TiO2 was investigated in two kind of photoreactions: the salicylic acid photooxidation and the photocatalytic reduction of Cr(VI). Different photocatalytic behaviour has been found for the un-doped and iron-doped ZrO2-TiO2 systems which have been explained in terms of the EXAFS study. This study represents an example of attempt to prepare a new potential photoactive mixed oxide system, containing two ions (Ti4+ and Zr4+) with good photocatalytic activity if it is compared with commercial TiO2 (Degusssa P25) calcined at 600 °C. |
| Keywords: | EXAFS Heterogeneous photocatalysis Surface Sol–gel Iron-doped ZrO2 TiO2 |
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