The oxidation of trans-ferulic acid (C 10H 10O 4) in aqueous TiO 2 dispersion occurs via the formation of a charge-transfer complex on the TiO 2 surface that is able to absorb visible light (λ ≥ 400 nm). The main product is CO 2, whereas secondary oxidation products are organic species such as vanillin, caffeic acid, homovanillic acid, and vanillylmandelic acid. Oxidation through the formation of a charge-transfer complex occurs only in the presence of specific TiO 2 samples. Experiments in the absence of oxygen, in the presence of bromate ions and by using a phosphate-modified TiO 2, have been carried out for investigating the reaction mechanism. In order to study the interaction between trans-ferulic acid and TiO 2 surface and to characterize the charge-transfer complex, UV-Vis diffuse reflectance and FT-IR spectroscopies have been used. FT-IR characterization of TiO 2 samples in contact with the aqueous trans-ferulic acid solution indicates that the charge-transfer complex formation occurs via adsorption of bidentate ferulate species.

Parrino, F., Augugliaro, V., Camera-Roda, G., Loddo, V., Palmisano, G., LópezMuñoz, M., et al. (2012). Visible Light Induced Oxidation of Trans-ferulic Acid by TiO2 Photocatalysis. JOURNAL OF CATALYSIS, 295, 254-260 [10.1016/j.jcat.2012.08.018].

Visible Light Induced Oxidation of Trans-ferulic Acid by TiO2 Photocatalysis

PARRINO, Francesco;AUGUGLIARO, Vincenzo;LODDO, Vittorio;PALMISANO, Giovanni;PALMISANO, Leonardo;PUMA, Maria Angela
2012

Abstract

The oxidation of trans-ferulic acid (C 10H 10O 4) in aqueous TiO 2 dispersion occurs via the formation of a charge-transfer complex on the TiO 2 surface that is able to absorb visible light (λ ≥ 400 nm). The main product is CO 2, whereas secondary oxidation products are organic species such as vanillin, caffeic acid, homovanillic acid, and vanillylmandelic acid. Oxidation through the formation of a charge-transfer complex occurs only in the presence of specific TiO 2 samples. Experiments in the absence of oxygen, in the presence of bromate ions and by using a phosphate-modified TiO 2, have been carried out for investigating the reaction mechanism. In order to study the interaction between trans-ferulic acid and TiO 2 surface and to characterize the charge-transfer complex, UV-Vis diffuse reflectance and FT-IR spectroscopies have been used. FT-IR characterization of TiO 2 samples in contact with the aqueous trans-ferulic acid solution indicates that the charge-transfer complex formation occurs via adsorption of bidentate ferulate species.
Settore CHIM/07 - Fondamenti Chimici Delle Tecnologie
Parrino, F., Augugliaro, V., Camera-Roda, G., Loddo, V., Palmisano, G., LópezMuñoz, M., et al. (2012). Visible Light Induced Oxidation of Trans-ferulic Acid by TiO2 Photocatalysis. JOURNAL OF CATALYSIS, 295, 254-260 [10.1016/j.jcat.2012.08.018].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10447/64345
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