Abstract
In this work, TiO2-based nanomaterials have been successfully synthesized by doping TiO2 with Co, Mn, and Ni and by co-doping it with (P,Mo) or (P,W). The structural, optical, and morphological properties of the synthesized nanomaterials have been investigated using various techniques such as XRD, FTIR spectroscopy, UV-vis diffuse reflectance spectroscopy, XPS, and SEM-EDS. The obtained results showed that the crystalline structure of the doped TiO2-based nanomaterials depends strongly on the nature of the doping ions. The obtained band gap energy of TiO2 co-doped with (P,Mo) changes to a level below the band gap energy of TiO2 anatase indicating a high ability to absorb visible light. The obtained photocatalytic activity results of methyl orange degradation showed that, under visible light, the mono-doping of TiO2 with Co and its co-doping with (P,Mo) or (P,W) improve significantly the photocatalytic activity of TiO2 in comparison with undoped TiO2. The activity order obtained under UV-A irradiation for the used photocatalysts is TiO2 > > 1%Ni-TiO2 > 1%Co-TiO2 > 30%(P,Mo)-TiO2 ≈ 30%(P,W)TiO2 > 1%Mn-TiO2 while under visible light, it is 1%Co-TiO2 > 30%(P,Mo)-TiO2 > 30%(P,W)TiO2 ≈ TiO2 > 1%Ni-TiO2 > 1%Mn-TiO2. The high photocatalytic activity observed for these samples could be the result of a synergetic effect of the high visible light absorption capacity and the low recombination rate of photoexcited electrons and holes.
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Acknowledgments
Authors thankfully acknowledge Moulay Ismail University (Meknes-Morocco) and the European Union for providing an opportunity to Mr. Abderrahim El Mragui to work in the University of Porto, Portugal, through ERASMUS-MOBILE + doctoral mobility fellowship. The authors also thank the CEMUP (University of Porto) for the XPS and SEM-EDS analyses.
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El Mragui, A., Zegaoui, O., Daou, I. et al. Preparation, characterization, and photocatalytic activity under UV and visible light of Co, Mn, and Ni mono-doped and (P,Mo) and (P,W) co-doped TiO2 nanoparticles: a comparative study. Environ Sci Pollut Res 28, 25130–25145 (2021). https://doi.org/10.1007/s11356-019-04754-6
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DOI: https://doi.org/10.1007/s11356-019-04754-6