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International Journal of Photoenergy
Volume 2011, Article ID 259453, 10 pages
http://dx.doi.org/10.1155/2011/259453
Research Article

Selective Photooxidation and Photoreduction Processes at 𝐓 𝐢 𝐨 𝟐 Surface-Modified by Grafted Vanadyl

1CNR-ISOF, U.O.S. of Ferrara, c/o Department of Chemistry, University of Ferrara, Via L. Borsari 46, I-44121 Ferrara, Italy
2Department of Chemistry, University of Ferrara, Via L. Borsari 46, I-44121 Ferrara, Italy
3Department of Chemistry, University of Rome “La Sapienza”, Piazzale Aldo Moro 5, I-00185 Rome, Italy

Received 16 May 2011; Revised 27 July 2011; Accepted 27 July 2011

Academic Editor: Ignazio Bellobono

Copyright © 2011 Rossano Amadelli et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Titanium dioxide was surface-modified by grafting vanadyl species using vanadyl triisopropoxide as a precursor. The resulting material, (VOx)n/TiO2, was characterized by Raman spectroscopy and photoelectrochemical methods. Photocatalytic oxidation of benzyl alcohol and cyclohexene were used to test oxidation selectivity and 4-nitro-benzaldehyde to assess selective photoreduction. The surface-modified TiO2 exhibits an enhanced selectivity to benzaldehyde in the photocatalytic oxidation of benzyl alcohol in an aqueous medium and an increase of cyclohexenol formation in the case of cyclohexene in nonaqueous solvent. The salient result is the 100% selective reduction of the nitrogroup in 4-nitro-benzaldehyde achieved under mild experimental conditions.