| Title | Photocatalytic activity of nanocomposite catalyst films based on nanocrystalline metal/semiconductors |
| Abstract | The photocatalytic properties of anatase TiO2
nanorods
(NRs) and noble metalsemiconductor nanocomposites (TiO2NRs/Ag)
prepared by colloidal chemistry routes and immobilized onto suitable
substrates were investigated. Photocatalytic experiments were performed
under UV irradiation in order to test the degradation of a target compound
(the azo dye, methyl red) in aqueous solution using TiO2P25 Degussa as a
reference material. Absorbance spectroscopy and liquid chromatography/
mass spectrometry (LC/MS) measurements pointed out that, according to
pH conditions, TiO2NRs and TiO2NRs/Ag presented a photoactivity up to
1.3 and 2 times higher than TiO2P25 Degussa, respectively. Notably, the
TiO2NRs/Ag-based catalysts demonstrated a photocatalytic activity 2-fold
higher than bare TiO2NRs. Remarkably, only a negligible dependence on pH conditions was detected for the nanocomposite
catalyst, whereas both TiO2NRs and TiO2
P25 Degussa showed much higher photoactivity at acidic pH. In all the investigated cases,
the identified byproducts pointed out the occurrence of the same reaction mechanism, basically relying on the hydroxyl radical
attaching on the benzene ring and on the homolytic rupture of the nitrogencarbon bond of the dimethyl-amino moiety. |
| Source | Journal of physical chemistry. C 115, pp. 12033–12040 |
| Keywords | Photocatalysis |
| Journal | Journal of physical chemistry. C |
| Editor | American Chemical Society,, Washington DC, Stati Uniti d'America |
| Year | 2011 |
| Type | Articolo in rivista |
| Authors | Petronella F., Fanizza E., Mascolo G., Locaputo V., Bertinetti L., Martra G.,Coluccia S., Agostiano A., Curri M. L., Comparelli R. |
| Text | 168947 2011 ISI Web of Science WOS 000291709600020 Photocatalysis Photocatalytic activity of nanocomposite catalyst films based on nanocrystalline metal/semiconductors Petronella F., Fanizza E., Mascolo G., Locaputo V., Bertinetti L., Martra G.,Coluccia S., Agostiano A., Curri M. L., Comparelli R. CNR IPCF Bari CNR IRSA Bari Univ. Torino Univ. Bari dip Chimica The photocatalytic properties of anatase TiO2 nanorods NRs and noble metalsemiconductor nanocomposites TiO2NRs/Ag prepared by colloidal chemistry routes and immobilized onto suitable substrates were investigated. Photocatalytic experiments were performed under UV irradiation in order to test the degradation of a target compound the azo dye, methyl red in aqueous solution using TiO2P25 Degussa as a reference material. Absorbance spectroscopy and liquid chromatography/ mass spectrometry LC/MS measurements pointed out that, according to pH conditions, TiO2NRs and TiO2NRs/Ag presented a photoactivity up to 1.3 and 2 times higher than TiO2P25 Degussa, respectively. Notably, the TiO2NRs/Ag based catalysts demonstrated a photocatalytic activity 2 fold higher than bare TiO2NRs. Remarkably, only a negligible dependence on pH conditions was detected for the nanocomposite catalyst, whereas both TiO2NRs and TiO2 P25 Degussa showed much higher photoactivity at acidic pH. In all the investigated cases, the identified byproducts pointed out the occurrence of the same reaction mechanism, basically relying on the hydroxyl radical attaching on the benzene ring and on the homolytic rupture of the nitrogencarbon bond of the dimethyl amino moiety. 115 Published version Articolo in rivista American Chemical Society, 1932 7447 Journal of physical chemistry. C Journal of physical chemistry. C J. phys. chem., C Journal of physical chemistry. Nanomaterials and interfaces FANIZZA ELISABETTA angela.agostiano AGOSTIANO ANGELA francesca.petronella PETRONELLA FRANCESCA marialucia.curri CURRI MARIA LUCIA vito.locaputo LOCAPUTO VITO roberto.comparelli COMPARELLI ROBERTO giuseppe.mascolo MASCOLO GIUSEPPE MD.P01.022.001 Materiali nanostrutturati e molecole biologiche per strutture organizzate TA.P07.002.006 Trattamenti avanzati di ossidazione |
