Photo-oxidation activities on Pd-doped TiO sub(2) nanoparticles: critical PdO formation effect

The catalytic activities of three distinct Pd-doped TiO sub(2) (PdTiO sub(2)) nanoparticle samples, post-annealed (at 700, 800, and 900 [degrees]C) after fabrication on silicon substrates, were analyzed with respect to the photo-oxidation of aniline and 2-thiophenecarboxaldehyde. Through a combinati...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2015-04, Vol.165, p.20-26
Main Authors: Lee, Hangil, Shin, Minjeong, Lee, Myungjin, Hwang, Yun Jeong
Format: Article
Language:English
Subjects:
Annealing
Energy gaps (solid state)
Nanoparticles
Oxidation
Palladium
Photocatalysis
Silicon substrates
Spectra
Titanium dioxide
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Summary:The catalytic activities of three distinct Pd-doped TiO sub(2) (PdTiO sub(2)) nanoparticle samples, post-annealed (at 700, 800, and 900 [degrees]C) after fabrication on silicon substrates, were analyzed with respect to the photo-oxidation of aniline and 2-thiophenecarboxaldehyde. Through a combination of Raman spectroscopy and high-resolution photoemission spectroscopy (HRPES), we demonstrated that the photocatalytic oxidation occurred only when the PdTiO sub(2) nanoparticles were annealed at temperatures above 800 [degrees]C, that is, when PdO and Ti super(3+) had partially formed on the PdTiO sub(2) nanoparticles, which indicates that the presence of PdO and Ti super(3+) is critical for the photocatalytic oxidation. Additionally, we determined the decrease in the band gaps to visible region with PdTiO sub(2) nanoparticles annealed above 800 [degrees]C from their valence-band spectra, which resulted in photocatalytic activities even under visible light, [lambda] = 540 nm.
ISSN:0926-3373
DOI:10.1016/j.apcatb.2014.09.061