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.

Comparison of the photocatalytic activityof TiO2-WO3 materials in oxidation and reduction reactions

M.V. Dozzi
Primo
;
S. Marzorati
Secondo
;
M. Longhi;M. Coduri
Penultimo
;
E. Selli
2014

Abstract

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.
TiO2; WO3; photocatalysis; formic acid oxidation; Cr(VI) photoreduction
Settore CHIM/02 - Chimica Fisica
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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/252626
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