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Sun irradiated high efficient photocatalyst ZnO nanoparticles obtained by assisted microwave irradiation

[Display omitted] •Highly efficient ZnO non-doped applied to methylene blue mineralization is reported.•The used microwave technique promote the intrinsic defects generation.•The methylene blue dye was mineralized under direct sunlight irradiation.•High photocatalytic efficiency (95.3 % in 70 min) i...

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Published in:Materials science & engineering. B, Solid-state materials for advanced technology Solid-state materials for advanced technology, 2023-03, Vol.289, p.116263, Article 116263
Main Authors: Perez-Cuapio, R., Alberto Alvarado, J., Juarez, Hector, Sue, H-J.
Format: Article
Language:English
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Summary:[Display omitted] •Highly efficient ZnO non-doped applied to methylene blue mineralization is reported.•The used microwave technique promote the intrinsic defects generation.•The methylene blue dye was mineralized under direct sunlight irradiation.•High photocatalytic efficiency (95.3 % in 70 min) is obtained.•This work establishes the experimental process for scalable photocatalytic activity. In this research microwave assisted zinc oxide synthesis applied to methylene blue dye mineralization is reported. This technique strongly influences the presence of certain intrinsic defects that is similar to those obtained by techniques where a rich oxygen atmosphere is used. These defects play a strong role in photocatalysis, showing a short time (70 min) at 95.3 % efficiency in methylene blue degradation under direct sunlight irradiation. Through X-ray diffraction, crystallinity, and nanoparticle size (5 nm) were obtained, meanwhile the morphology and elemental composition was observed by Scanning Electron Microscopy and Energy-Dispersive X-ray respectively. Additionally, Ultraviolet–Visible and Photoluminescence methods complete the analysis letting calculate the band gap (3.5 eV) and the presence/contribution of intrinsic defects. Such defects are identified as direct and strong contributors to carrier’s concentration separation and alternatively provoking low recombination levels, which is a characteristic desired in organic materials mineralization.
ISSN:0921-5107
1873-4944
DOI:10.1016/j.mseb.2023.116263