Photocatalytic degradation of methylene blue using sprayed Mg diluted ZnO heterostructure thin flms photocatalysts
No Thumbnail Available
Date
2021-03-07
Journal Title
Journal ISSN
Volume Title
Publisher
Reaction Kinetics, Mechanisms and Catalysis
Abstract
The thin layers of ZnOx%/MgO [x=30, 40 and 50 at%], were prepared by the spray
pyrolysis method on glass substrates at 450 °C, then tested for methyl blue (MB)
degradation under visible irradiations. The ZnOx%/MgO [x=30,40 and 50 at%]
thin flms were analysed by X-ray difraction (XRD), scanning electron microscopy
(SEM), UV–Vis spectroscopy and Mott-Schottky analysis. X-ray difraction analysis
revealed that the layers have a polycrystalline nature of hexagonal (wurtzite) and
cubic structure. Microstructures the flms were also analyzed using scanning elec tron. The flms show a radical change in the surface morphology in accordance with
the XRD results. The above analyses confrm the co-existence of a mixture of the
wurtzite (ZnO) structure and cubic phase of MgO. The use of these mixed layers
in the photo degradation of MB gave satisfactory results. Indeed, the photocatalytic
tests showed the efciency of Mg diluted ZnO flms with the best yield in the case
of 50% diluted ZO flms. It was confrmed that the ZnO50%/MgO had a profound
efect on reduction of band gap and photocatalytic performances
Description
/
Keywords
Citation
11