In order to minimize the rate of the fast and undesired recombination of photoproduced e-/h+ pairs on the TiO2 surface, the effect induced by coupling TiO2 with different amounts of WO3, according to an alkaline-catalyzed sol-gel method followed by an incipient wetting procedure, has been investigated in both an oxidation and a reduction process, i.e. in formic acid (FA) mineralization and in Cr(VI) reduction in aqueous suspensions at pH 3.7 under UV-vis irradiation. A different photoactivity trend of TiO2-WO3 materials in the two investigated test reactions was clearly observed. While the progressive increase of W/Ti content limited the surface properties of titania in FA oxidation, the coupling of TiO2 with relatively small amounts of WO3 (0.2-1.0 mol.%) was beneficial in increasing the rate of Cr(VI) photoreduction, pointing to an essential role of WO3 domains in photopromoted electron transfer efficiency.
Comparison of the photocatalytic activityof TiO2-WO3 materials in oxidation and reduction reactions / M.V. Dozzi, S. Marzorati, M. Longhi, M. Coduri, E. Selli. ((Intervento presentato al convegno CRC International Symposium Novel Photocatalysts for Environmental Purification and Energy generation tenutosi a Hokkaido nel 2014.
Titolo: | Comparison of the photocatalytic activityof TiO2-WO3 materials in oxidation and reduction reactions |
Autori: | DOZZI, MARIA VITTORIA (Primo) MARZORATI, STEFANIA (Secondo) CODURI, MAURO (Penultimo) |
Data di pubblicazione: | ott-2014 |
Parole Chiave: | TiO2; WO3; photocatalysis; formic acid oxidation; Cr(VI) photoreduction |
Settore Scientifico Disciplinare: | Settore CHIM/02 - Chimica Fisica |
Tipologia: | Conference Object |
Citazione: | Comparison of the photocatalytic activityof TiO2-WO3 materials in oxidation and reduction reactions / M.V. Dozzi, S. Marzorati, M. Longhi, M. Coduri, E. Selli. ((Intervento presentato al convegno CRC International Symposium Novel Photocatalysts for Environmental Purification and Energy generation tenutosi a Hokkaido nel 2014. |
Appare nelle tipologie: | 14 - Intervento a convegno non pubblicato |