| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 43576 | Applied Catalysis A: General | 2008 | 5 Pages |
Titanium(IV) oxide (TiO2) particles were modified with several kinds of transition-metal ions (iron(III), copper(II), nickel(II) and chromium(III) ions). Photocatalytic activity for acetaldehyde decomposition over metal-ion-modified TiO2 showed higher photocatalytic activity than bare TiO2 under ultraviolet (UV) as well as visible-light irradiation. The mechanism of photocatalytic reaction over metal-ion-modified TiO2 was investigated by double-beam photoacoustic (DB-PA) spectroscopy, which enables observation of electron migration in the TiO2 particles. DB-PA measurements suggested that metal ions on TiO2 surface acted differently depending on the wavelength of photoirradiation, i.e., as electron acceptors under UV irradiation and as electron injectors under visible-light irradiation.
Graphical abstractThe redox site of photocatalytic reaction on titanium(IV) oxide particles modified with a transition-metal ion was switched by the wavelength of photoirradiation, i.e., reduction took place over the metal ion under ultraviolet irradiation, while oxidation proceeded over the metal ion under visible-light irradiation. Figure optionsDownload full-size imageDownload as PowerPoint slide
