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EnglishThe photo-oxidation of 3,4-dihydroxy-cinnamic acid (DHCA) is investigated on TiO2 films prepared from commercial Degussa P-25 (FP25 films) and from colloidal TiO2 prepared by the sol-gel method (FSG films). Photo-oxidation rates have been found to be inversely correlated to the amount of adsorbed species. The extent of adsorption increases as the solution pH increases from 1 to 4 and is more pronounced in the case of FP25 samples for which the amount of adsorbed species is 2.7 × 10-10 mol cm-2, i.e. about threefold higher than for the FSG case. Analysis of DHCA adsorption on TiO2 suspensions provided information complementary to that collected on films. Diffuse reflectance UV-visible and FTIR spectra of adsorbed DHCA are conspicuously different for the two types of films. © 2009 Elsevier B.V. All rights reserved.
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| Data di pubblicazione: | 2009 | |
| Titolo: | Adsorption and photo-oxidation of 3,4-dihydroxy-cinnamic acid on TiO2 films | |
| Autori: | R. AMADELLI; A. MALDOTTI; L. SAMIOLO | |
| Rivista: | CATALYSIS TODAY | |
| Parole Chiave: | 3,4-Dihydroxy-cinnamic acid; Adsorption; Films; Photo-oxidation; Titanium dioxide; | |
| Abstract: | The photo-oxidation of 3,4-dihydroxy-cinnamic acid (DHCA) is investigated on TiO2 films prepared from commercial Degussa P-25 (FP25 films) and from colloidal TiO2 prepared by the sol-gel method (FSG films). Photo-oxidation rates have been found to be inversely correlated to the amount of adsorbed species. The extent of adsorption increases as the solution pH increases from 1 to 4 and is more pronounced in the case of FP25 samples for which the amount of adsorbed species is 2.7 × 10-10 mol cm-2, i.e. about threefold higher than for the FSG case. Analysis of DHCA adsorption on TiO2 suspensions provided information complementary to that collected on films. Diffuse reflectance UV-visible and FTIR spectra of adsorbed DHCA are conspicuously different for the two types of films. © 2009 Elsevier B.V. All rights reserved. | |
| Digital Object Identifier (DOI): | 10.1016/j.cattod.2008.12.020 | |
| Handle: | http://hdl.handle.net/11392/532507 | |
| Appare nelle tipologie: | 03.1 Articolo su rivista |
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