Photocatalysis; sunlight; ZnO; metal oxides doping
Abstract :
[en] In this study we report, the synthesis of ZnO and its doping with Transition Metal Oxides
-TMO-, such as Cr2O3, MnO2, FeO, CoO, NiO, Cu2O and CuO. Various characterization
techniques were employed to investigate the structural properties. The X-ray diffraction
(XRD) data and Rietveld refinement confirmed the presence of TMO phases and that the
ZnO structure was not affected by doping with TMO which was corroborated using
transmission Electron microscopy (TEM). Surface areas were low due to blockage of
adsorption sites by particle aggregation. TMO doping concentration range was 3.7-5.1%
and was important to calculate the catalytic activity. The UV–Visible spectra showed the
variation in the band gap of TMO/ZnO ranging from 3.45 to 2.46 eV. The surface
catalyzed decomposition of H2O2 was used as model reaction to examinate the
photocatalytic activity following the oxygen production and the systems were compared
to bulk ZnO and commercial TiO2-degussa (Aeroxyde-P25). The results indicate that
introduction of TMO species increase significantly the photocatalytic activity. The
sunlight photocatalytic performance in ZnO-doped was greater than bulk-ZnO and in the
case of MnO2, CoO, Cu2O and CuO surpasses TiO2 (P25-Degussa). This report opens up
a new pathway to the design of high-performance materials used in photocatalytic
degradation under visible light irradiation.
Disciplines :
Materials science & engineering Chemistry Chemical engineering
Author, co-author :
Ramírez S., Alfonso E.; Universidad del Cauca, Popayán - Cauca, Colombia > Departmento de Química > Grupo de Catalisis
Montero-Muñoz, Marly; University of Brasilia, Brazil > Institute of Physics
López, Lizbeth L.; Universidad Santiago de Cali, Cali-Colombia > Facultad de Ciencias Básicas > Grupo de Investigación en Electroquı́mica y Medio Ambiente
Ramos- Ibarra, J.E.; University of Brasilia, Brazil > Institute of Physics
Coaquira, Jose A.H.; University of Brasilia, Brazil > Institute of Physics
Heinrichs, Benoît ; Université de Liège - ULiège > Department of Chemical Engineering > Génie chimique - Nanomatériaux et interfaces
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