Synthesis of Mg-doped ZnO NPs via a chemical low-temperature method and investigation of the efficient photocatalytic activity for the degradation of dyes under solar light

Doped semiconductors nanostructures (NSs) have shown great interest as a potential for green and efficient photocatalysis activities. Magnesium (Mg)-doped zinc oxide (ZnO) nanoparticles (NPs) has been synthesized by a one-step chemical low temperature (60 °C) co-precipitation method without further...

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Bibliographic Details
Published in:Solid state sciences Vol. 99; p. 106053
Main Authors: Adam, Rania E., Alnoor, Hatim, Pozina, Galia, Liu, Xianjie, Willander, Magnus, Nur, Omer
Format: Journal Article
Language:English
Published: Elsevier Masson SAS 01.01.2020
Subjects:
Congo red
Methylene blue
Mg-doped ZnO NPs
Photocatalytic
Photodegradation
ZnO nanoparticles
Photodegradation
Photocatalytic
Congo red
ZnO nanoparticles
Mg-doped ZnO NPs
Methylene blue
ISSN:1293-2558, 1873-3085, 1873-3085
Online Access:Get full text
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Summary:Doped semiconductors nanostructures (NSs) have shown great interest as a potential for green and efficient photocatalysis activities. Magnesium (Mg)-doped zinc oxide (ZnO) nanoparticles (NPs) has been synthesized by a one-step chemical low temperature (60 °C) co-precipitation method without further calcination and their photocatalytic performance for photodegradation of Methylene blue (MB) dye under the illumination of solar light is investigated. The crystal structure of the synthesized NPs is examined by X-ray diffraction (XRD). XRD data indicates a slight shift towards higher 2θ angle in Mg-doped samples as compared to the pure ZnO NPs which suggest the incorporation of Mg2+ into ZnO crystal lattice. X-ray photoelectron spectroscopy (XPS), UV–Vis spectrophotometer and cathodoluminescence (CL) spectroscopy, were used to study electronics, and optical properties, respectively. The XPS analysis confirms the substitution of the Zn2+ by the Mg2+ into the ZnO crystal lattice in agreement with the XRD data. The photocatalytic activities showed a significant enhancement of the Mg-doped ZnO NPs in comparison with pure ZnO NPs. Hole/radical scavengers were used to reveal the mechanism of the photodegradation. It was found that the addition of the Mg to the ZnO lattices increases the absorption of the hydroxyl ions at the surface of the NPs and hence acts as a trap site leading to decrease the electron-hole pair and consequently enhancing the photodegradation. [Display omitted] •Base and Magnesium doped ZnO NPs were synthesized by the chemical low-temperature co-precipitation route.•The photodegradation efficiency was found to be increasing with increasing the atomic concentration of Magnesium.•Trapping experiments indicated that holes are the major species that were responsible for the degradation of Methylene blue.•Methylene blue was found to degrade faster than the Congo red.
ISSN:1293-2558
1873-3085
1873-3085
DOI:10.1016/j.solidstatesciences.2019.106053