Photocatalytic activity of N, S co-doped and N-doped commercial anatase TiO2 powders towards phenol oxidation and E. coli inactivation under simulated solar light irradiation.

• Autores: Rengifo Herrera, Julian Andres; Pulgarin, Cesar
• Año de publicación: 2009
• Idioma: inglés
• Tipo de recurso: artículo
• Materia: Heterogeneous Photocatalysis; Helio-Photocatalysis; Nitrogen Doped Tio2; Sulfur Doped Tio2
• Institución: Consejo Nacional de Investigaciones Científicas y Técnicas

Nitrogen and sulfur co-doped and N-doped TiO2 anatase TKP 102 (Tayca) were prepared by manual grinding with thiourea and urea, respectively, and annealing at 400 C. Both materials showed visible-light absorption as measured by Diffuse Reflectance Spectroscopy (DRS). Interstitial N-doping, anionic and cationic S- doping was found when the TiO2 was doped with thiourea while TiO2 doped with urea showed only the presence of interstitial N-doping as measured by X-ray Photo-electron Spectroscopy (XPS). The N content on the surface of N-doped TKP 102 photocatalyst was 2.85 at.% and higher than the N content in the N, S co-doped TiO2 photocatalyst (0.6 at.%). The photocatalytic activity of the doped catalysts was tested using phenol and Escherichia coli as chemical and biological targets, respectively, using N, S co-doped, N-doped TiO2, undoped Degussa P-25 and undoped TKP 102 powders under simulated solar light. It was found that undoped Degussa P-25 was the photocatalyst with the highest photocatalytic activity towards phenol oxidation and E. coli inactivation. N, S co-doped powders showed almost the same photocatalytic activity as undoped TKP 102 while N-doped TKP 102 was the less active photocatalyst probably due the N impurities on the TiO2 acting as recombination centers.
Fil: Rengifo Herrera, Julian Andres. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico La Plata. Centro de Investigación y Desarrollo en Ciencias Aplicadas; Argentina
Fil: Pulgarin, Cesar. Ecole Polytechnique Federale de Lausanne; Suiza