Effect of Annealing Environments on Self-Organized TiO2 Nanotubes for Efficient Photocatalytic Applications
In the present study, amorphous titanium dioxide (TiO2) nanotubes were synthesized by one-step anodization technique and subsequently annealed in different environments to investigate the effect of annealing atmospheres on the formation of different crystalline phases. X-ray
Diffraction (XRD) patterns clearly showed the presence of anatase TiO2 phase with various crystallite sizes. The samples annealed in oxygen and air atmospheres at 500 °C showed a dominant anatase phase and a small amount of rutile phase, on the other hand, the samples annealed
in nitrogen and argon atmospheres and in a vacuum at 500 °C contained the anatase phase only. XPS analysis of the samples showed a broadening in the binding energy curves with respect to variation in annealing atmosphere, confirming the variation in surface defects, which in turn affect
photocatalytic degradation. The vacuum-annealed sample showed superior photocatalytic degradation efficiency as it had relatively higher pseudo-first order rate constants (k) of 0.009/min.
Document Type: Research Article
Publication date: 01 December 2012
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