Synthesis and characterization of ZnO and ZnO:Al by spray pyrolysis with high photocatalytic properties

M. Bizarro, A. Sánchez-Arzate, I. Garduño-Wilches, J. C. Alonso, A. Ortiz

Resultado de la investigación: Contribución a una revistaArtículorevisión exhaustiva

51 Citas (Scopus)

Resumen

The pneumatic spray pyrolysis technique was used to deposit zinc oxide and aluminum doped zinc oxide films. X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), and optical transmission were used to characterize the films and their photocatalytic activities were measured by the degradation of an organic dye under ultraviolet irradiation. A thickness-based rate constant was calculated for both, undoped and Al-doped thin films, obtaining values of kt(ZnO) = 0.25 and kt(ZnO:Al) = 0.32 h-1 μm-1, respectively, which resulted higher than that of a TiO2 film (kt = 0.21 h-1 μm-1). The stability of the films was also evaluated by the repetition of the degradation test three times. A slight decrease in the activity was observed after the third cycle particularly for the doped film. These results along with the characterization results show that the incorporation of aluminum to the zinc oxide matrix produce a slight increase in the optical band gap of ZnO:Al (3.26 eV) compared to the pure ZnO film (3.23 eV), and favors the formation of surface structures that contributed to enhance the photocatalytic activity.

Idioma originalInglés
Páginas (desde-hasta)129-134
Número de páginas6
PublicaciónCatalysis Today
Volumen166
N.º1
DOI
EstadoPublicada - 30 may 2011
Publicado de forma externa

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