Identificador persistente para citar o vincular este elemento: http://hdl.handle.net/10553/43239
Título: Highly photoactive ZnO by amine capping-assisted hydrothermal treatment
Autores/as: Colón Ibáñez, Gerardo
Hidalgo, M. C.
Navío, J. A.
Pulido Melián, Elisenda 
González Díaz, Oscar Manuel 
Doña Rodríguez, José Miguel 
Clasificación UNESCO: 2301 química analítica
Palabras clave: ZnO
Amine capping-assisted
Hydrothermal
Fecha de publicación: 2008
Editor/a: 0926-3373
Proyectos: Preparacion, Caracterizacion y Propiedades de Sistemas Fotocataliticos Altamente Reactivos Basados en Aplica<Ciones Medioambientales 
Publicación seriada: Applied Catalysis B: Environmental 
Resumen: ZnO nanoparticles have been prepared by amine template assisted sol–gel precipitation and further hydrothermal treatment. We have investigated the effect of different pH values achieved by means of triethylamine (TEA) addition in the final surface and structural properties. Two sets of samples were obtained after thermal treatment, one with no hydrothermal pre-treatment and a second hydrothermally pre-treated. Surprisingly the precipitate obtained after the amine addition also exhibits good photocatalytic properties. It has been stated that calcination treatment leads in both sets of samples to a significant improvement in the photocatalytic properties of the studied systems. Therefore, interesting comparison has been performed between hydrothermal pre-treated and direct thermal treated samples. Surface and morphological features notably differ from ZnO prepared using different synthetic route. Wide surface and structural characterization of the samples have been carried out, and correlations with precipitation pH are pointed out from this characterization. In all cases, the amine templated ZnO obtained exhibit high conversion values for phenol photo-oxidation reaction. Further calcination treatment in all of the studied samples clearly leads to photocatalytic conversions higher than that exhibited by TiO2 Degussa P25. This fact is even more significant if we consider that hydrothermally and calcined ZnO exhibit almost null surface area values, leading to a startling intrinsic photoactivity. The structural excellence (crystallinity, lack of defects, crystallite size, etc.) of such systems is clearly responsible for their high photoactivity values.
URI: http://hdl.handle.net/10553/43239
ISSN: 0926-3373
DOI: 10.1016/j.apcatb.2008.01.033
Fuente: Applied Catalysis B: Environmental [ISSN 0926-3373], v. 83 (1-2), p. 30-38
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