Effects of anatase TiO2 morphology and surface fluorination on environmentally relevant photocatalytic reduction and oxidation reactions |
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Authors: | M.V. Dozzi M. Montalbano G. Marra L. Mino E. Selli |
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Affiliation: | 1. Dipartimento di Chimica, Università degli Studi di Milano, via C. Golgi 19, I-20133 Milano, Italy;2. Eni S.p.A Renewable Energy, Magnetic Fusion and Material Science Research Center (DE-R&D), via G. Fauser 4, I-28100 Novara, Italy;3. Dipartimento di Chimica and NIS Centre, University of Torino, via P. Giuria 7, I-10125 Torino, Italy |
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Abstract: | Aiming at clarifying the interplay on TiO2 photoactivity between particle morphology and surface fluorination, the photocatalytic performance of anatase nanocrystals, characterized by a pseudo-spherical shape or a nanosheet structure, is investigated in both a reduction and an oxidation reaction, either in the absence or in the presence of added fluoride anions. Cr(VI) photocatalytic reduction is strongly favored by a large exposure of anatase {001} facets; however, surface fluorination leads in this case to a morphology-independent photoactivity decrease, due to the decreased adsorption of the reaction substrate. More interestingly, a beneficial synergistic effect between the platelet-like anatase morphology and TiO2 surface fluorination is clearly outlined in Rhodamine B photocatalytic degradation, possibly resulting from the intrinsic ability of fluorinated {001} anatase facets of boosting ?OH radical mediated oxidation paths, due to their larger amount of surface –OH groups, as revealed using Fourier-transform infrared spectroscopy. |
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Keywords: | {001} Facets Surface fluorination Cr(VI) photocatalytic reduction Rhodamine B photocatalytic degradation |
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