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Switching redox site of photocatalytic reaction on titanium(IV) oxide particles modified with transition-metal ion controlled by irradiation wavelength

Paper ID Volume ID Publish Year Pages File Format Full-Text
43576 45977 2008 5 PDF Available
Title
Switching redox site of photocatalytic reaction on titanium(IV) oxide particles modified with transition-metal ion controlled by irradiation wavelength
Abstract

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

Keywords
Photocatalyst; Titanium(IV) oxide; Visible-light response photocatalyst; Transition-metal ion; Switching redox sites
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Switching redox site of photocatalytic reaction on titanium(IV) oxide particles modified with transition-metal ion controlled by irradiation wavelength
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 348, Issue 1, 30 September 2008, Pages 148–152
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us