open access

https://hdl.handle.net/2115/87959

Photocatalytic Activity of Radial Rutile Titanium(IV) Oxide Microspheres for Aerobic Oxidation of Organics

英語

CBB pattern

2022-02-04

Wiley-Blackwell

ChemPhysChem

23(3)

e202100793

Radial rutile TiO2 nanorod homomesocrystals (TiO2-NR HOMCs) or the so-called "sea urchin-like TiO2 microspheres" were synthesized by using a hydrothermal method. TiO2-NR HOMCs show photocatalytic activity for aerobic oxidative degradation of 2-naphthol under irradiation of UV- and visible light. Furthermore, extremely small iron oxide clusters were formed on the surface of TiO2-NR HOMCs (FeOx/TiO2-NR HOMCs) by the chemisorption-calcination technique to reduce the band gap. The FeOx-surface modification gives rise to drastic enhancement of the UV- and visible-light activity. Reversed double-beam photoacoustic spectroscopy measurements were performed for TiO2-NR HOMCs and FeOx/TiO2-NR HOMCs to obtain the ERDT (energy-resolved distribution of electron traps)/CBB (conduction-band bottom) patterns. The ERDT/CBB pattern of TiO2-NR HOMCs consists of two components derived from rutile (C1) and amorphous TiO2 (C2). In the pattern, the surface electron traps in C2 exist near the CBB to be removed by the FeOx-surface modification. By taking this finding into consideration, the striking surface modification effect is ascribable to the electrocatalytic activity (or the action as an electron reservoir) of the FeOx clusters for multiple ORR, the suppression of recombination, and the increase in the visible-light harvesting efficiency.

学術雑誌論文

Accepted Manuscript

This is the peer reviewed version of the following article: R. Kojima, B. Ohtani, H. Tada, ChemPhysChem 2022, 23, e202100793., which has been published in final form at https://doi.org/10.1002/cphc.202100793. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. This article may not be enhanced, enriched or otherwise transformed into a derivative work, without express permission from Wiley or by statutory rights under applicable legislation. Copyright notices must not be removed, obscured or modified. The article must be linked to Wiley’s version of record on Wiley Online Library and any embedding, framing or otherwise making available the article or pages thereof by third parties from platforms, services and websites other than Wiley Online Library must be prohibited.

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