Photocatalytic Activity of SrTiO3 Nanoparticles: An in situ FT-IR Study

Dilip K. Paul 1Chih-ang Chang 1Brian Ray 1Dmytro Demydov 2Kenneth J. Klabunde 2

1. Pittsburg State University, 1701 S. Broadway, Pittsburg 66762, United States
2. Kansas State University, Department of Chemistry, Willard Hall, Manhattan 66506, United States

Abstract

SrTiO3 was prepared by using sol-gel method which involve hydrolysis of alkoxide mixtures in an alcohol-toluene solvent. The product was then characterized by XRD and other techniques. The adsorption and photocatalytic oxidation reaction of acetaldehyde was studied on these aerogel prepared SrTiO3 nanoparticles using in situ FT-IR spectroscopy in a specially designed stainless steel UHV cell. The photooxidation involved UV-Vis irradiation in the range of 2.1 to 5.0 eV. It has been found that a large fraction of acetaldehyde physisorbed onto the surface at 173 K which upon oxygen exposure in the dark did not undergo further oxidation. However, in presence of UV light exposure, the aldehyde underwent oxidation forming some CO2 and other oxidized species. The infrared assignments of all adsorbed species were used to explore the reaction mechanisms of photochemical reaction.

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Presentation: Invited oral at E-MRS Fall Meeting 2006, Symposium B, by Dilip K. Paul
See On-line Journal of E-MRS Fall Meeting 2006

Submitted: 2006-05-15 21:43
Revised:   2009-06-07 00:44
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