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Photocatalytic degradation mechanism of Ce-loaded ZnO catalysts toward methyl green dye pollutant

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Abstract

We report the photocatalytic activity of cerium-doped zinc oxide (Ce:ZnO) nanocrystals, toward the rapid degradation of methyl green dye molecules under black light (λ = 376 nm) irradiation. The Ce:ZnO samples are prepared by simple one-pot preparation methods with different Ce concentrations. The crystal parameters of the Ce:ZnO are derived from X-ray diffraction analysis and the corresponding band gap changes are probed with diffuse reflectance spectra. Raman spectral analysis reveals the vibrational properties of Ce:ZnO samples. Following that, the morphology and compositional analysis of Ce:ZnO nanocrystals are performed with scanning electron microscope and energy dispersive X-ray techniques, respectively. Finally, the photocatalytic performances of Ce:ZnO are compared and the role of Ce toward the improved photocatalytic activity of ZnO are discussed. It has been found that 68 and 98% of degradation is achieved for pure ZnO and Ce:ZnO, respectively. On the other hand in the composites form, CeO2-ZnO exhibits 100% degradation in just 30 min.

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Acknowledgements

Authors express their appreciation to the Deanship of Scientific Research at King Khalid University, Abha, for funding this work through research group program under grant number R.G.P2/87/41.

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Correspondence to Mohamed S. Hamdy.

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Al-Namshah, K.S., Mariappan, S.M., Shkir, M. et al. Photocatalytic degradation mechanism of Ce-loaded ZnO catalysts toward methyl green dye pollutant. Appl. Phys. A 127, 452 (2021). https://doi.org/10.1007/s00339-021-04602-w

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