Aiming at clarifying the interplay on TiO2 photoactivity between particle morphology and surface fluorination, the photocatalytic performance of anatase nanocrystals, characterized by a pseudospherical 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.

Effects of anatase TiO2 morphology and surface fluorination on environmentally relevant photocatalytic reduction and oxidation reactions [Effects of anatase TiO₂ morphology and surface fluorination on environmentally relevant photocatalytic reduction and oxidation reactions] / M.V. Dozzi, M. Montalbano, G. Marra, L. Mino, E. Selli. - In: MATERIALS TODAY CHEMISTRY. - ISSN 2468-5194. - 22(2021 Dec), pp. 100624.1-100624.11. [10.1016/j.mtchem.2021.100624]

Effects of anatase TiO2 morphology and surface fluorination on environmentally relevant photocatalytic reduction and oxidation reactions [Effects of anatase TiO₂ morphology and surface fluorination on environmentally relevant photocatalytic reduction and oxidation reactions]

M. V. Dozzi;M. Montalbano;E. Selli
2021-12

Abstract

Aiming at clarifying the interplay on TiO2 photoactivity between particle morphology and surface fluorination, the photocatalytic performance of anatase nanocrystals, characterized by a pseudospherical 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.
Platelet-like TiO2; {001} facets; surface fluorination; Cr(VI) photocatalytic reduction; Rhodamine B photocatalytic degradation;
Settore CHIM/02 - Chimica Fisica
10-nov-2021
MATERIALS TODAY CHEMISTRY
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/896430
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