Photocatalytic Oxidation of a Volatile Organic Component of Acetaldehyde Using Titanium Oxide Nanotubes

Xu, Huifang; Vanamu, Ganesh; Nie, Ziming; Konishi, Hiromi; Yeredla, Rakesh; Phillips, Jonathan; Wang, Yifeng

doi:https://doi.org/10.1155/JNM/2006/78902

Journal of Nanomaterials

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Nanoporous and Nanostructured Materials for Catalysis, Sensor, and Gas Separation Applications

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Volume 2006 | Article ID 078902 | https://doi.org/10.1155/JNM/2006/78902

Photocatalytic Oxidation of a Volatile Organic Component of Acetaldehyde Using Titanium Oxide Nanotubes

Huifang Xu,¹Ganesh Vanamu,²Ziming Nie,¹Hiromi Konishi,¹Rakesh Yeredla,¹Jonathan Phillips,³and Yifeng Wang⁴

Received14 Feb 2006

Revised09 Nov 2006

Accepted22 Dec 2006

Published31 Jan 2007

Abstract

Titanium oxide nanotubes are prepared and treated with Au (Au/nanotube sample) and Pt (Pt/nanotube sample), and the photoactivity of these catalysts compared to a standard Degussa P25 photocatalyst is investigated. The samples were analyzed using X-ray diffraction, field emission gun scanning transmission electron microscopy (STEM). Both high-resolution TEM images and high-angle annular dark-field (HAAD) images were recorded for the specimens. Oxidation of acetaldehyde was used to test the efficiency of the catalysts. Nanotube samples showed better photoactivity than the standard P25, because the P25 titania deactivates quickly. Enhanced reactivity of the nanotube is related to surface charge polarity developed on outer and inner surfaces due to the difference in overlap of oxygen anions that resulted from curving of octahedral sheets. A tentative and qualitative surface polarity model is proposed for enhancing electron-hole pair separation. The inner surface benefits reduction; whereas, the outer surface benefits oxidation reactions. Both the metal identity and the size of the metal particles in the nanotubes affected the photocatalytic activity. Specifically, the addition of platinum increased the activity significantly, and increased the total yield. The addition of gold had lesser impact compared to the platinum. Formation of Pt large nanoparticles on the nanotube surfaces reduces the oxidation reactivity.

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Copyright © 2006 Huifang Xu et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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