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Advances in Physical Chemistry
Volume 2011 (2011), Article ID 821204, 8 pages
http://dx.doi.org/10.1155/2011/821204
Research Article

N- T i O 𝟐 : Chemical Synthesis and Photocatalysis

1INQUIMAE-CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón II, 1428 Buenos Aires, Argentina
2Escuela de Ciencia y Tecnología, 3iA, Universidad Nacional de San Martín, Campus Miguelete, 1650 San Martín, Prov. de Buenos Aires, Argentina

Received 29 September 2011; Revised 17 November 2011; Accepted 17 November 2011

Academic Editor: Taicheng An

Copyright © 2011 Matias Factorovich 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.

Abstract

The chemical synthesis of nitrogen-doped titanium dioxide (N-TiO2) is explored in an attempt to understand the mechanisms of doping. Urea is used as precursor in a sol gel synthesis of N-TiO2. Chemical and structural changes during thermal treatment of the precursors were followed by several techniques. The effect of doping on band gap, morphology, and microstructure was also determined. The byproducts produced during firing correspond to those obtained during urea thermal decomposition. Polynitrogenated colored compounds produced at temperatures below 400°C may act as sensitizer. Incorporation of N in the TiO2 structure is possible at higher temperatures. Degradation experiments of salicylic acid under UVA and visible light ( 𝜆 > 4 0 0  nm) in the presence of TiO2 or N-TiO2 indicate that doping decreases the activity under UVA light, while stable byproducts are produced under visible light.