Structural characterization of Fe/Ti oxide photocatalysts by X-ray,ESR, and Mössbauer methods |
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Authors: | D Cordischi N Burriesci F DAlba M Petrera G Polizzotti M Schiavello |
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Institution: | 1. Dipartimento di Chimica, Università “La Sapienza,” Roma, Italy;2. Istituto CNR Trasformazione ed Accumulo di Energia, 98013 Messina, Italy;3. Istituto d''Ingegneria Chimica, Università di Palermo, 90128 Palermo, Italy;4. Istituto G. Donegani, Centro Ricerche Montedison, 28100 Novara, Italy |
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Abstract: | The polycrystalline solids TiO2Fe2O3, with iron contents in the range 0–10 at.%, prepared by coprecipitation and by impregnation, and treated in air at temperatures in the range 500–1000°C, have been studied by X-ray, ESR, and Mössbauer methods. The TiO2 in the samples treated at 800 and 1000°C always forms the rutile phase and the Fe3+ has a rather low solubility in it (~0.1 at.%). The Fe3+ in excess forms the antiferromagnetic pseudobrookite phase (Fe2TiO5). The samples treated at 500 and 650°C show a dependence on the preparation method. Those prepared by coprecipitation give at 500°C the pure anatase phase in which the Fe3+ has a higher solubility (≥ 1%); those prepared by impregnation give the anatase phase accompanied by a variable amount of rutile. The treatment at 650°C provokes the partial transformation of anatase to rutile and the complete development of the Fe2TiO5 phase. The relevance of these results to the photocatalytic properties shown by these solids for the photoreduction of dinitrogen to ammonia is discussed. |
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Keywords: | To whom all correspondence should be addressed |
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