Abstract
In the present study, an attempt has been made for synthesis, characterization and photocatalytic application of pure and Ni-doped α-Fe2O3 (hematite) nanoparticles by chemical co-precipitation method. The synthesized products have been studied by Thermo Gravimetric Analysis (TGA), Differential Thermal Analysis (DTA), X-ray diffraction (XRD), Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), Fourier Transform Infra-Red (FT-IR), Raman spectroscopy, Ultraviolet–Visible (UV–Vis) analysis and Vibrating Sample Magnetometer (VSM). The TGA showed three mass losses, whereas DTA resulted in three endothermic peaks. XRD measurements confirm that all the prepared nanocrystals consist only in nanocrystalline hematite phase. TEM and SEM show that the size of the nanoparticles decreases with Ni-do**. FTIR and Raman spectroscopies confirm the phase purity and the phonon modes of the synthesized nanoparticles. The UV–Vis absorption measurements confirm that the decrease of particle size is accompanied by a decrease in the band gap value from 2.02 eV for α-Fe2O3 down to 1.81 eV for 8 mol% Ni-doped α-Fe2O3. Furthermore, the magnetic properties demonstrated that all of the samples exhibited ferromagnetic behavior at room temperature. On the other part, the photocatalytic activity of Ni-doped α-Fe2O3 particles was studied using methylene blue (MB) as model organic pollutants. The 8 mol% Ni-doped α-Fe2O3 nanoparticles disclosed that the discoloration of MB reached 86% after irradiation of 140 min.
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06 May 2020
The Editor-in-Chief has retracted this article [1] because it substantially overlaps with the following articles (among others) [2,3,4,5]. [Author Abdelmajid Lassoued does not agree to this retraction and none of the other authors have responded to any correspondence from the editor or publisher about this retraction.]
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Acknowledgements
The present work was supported by the Research Funds of Electrochemistry, Materials and Environment Research Unit UREME (UR17ES45), Faculty of Sciences Gabes University, Tunisia and Structures, Properties and Modeling of Solids (SPMS) Laboratory, Ecole Centrale Paris, France.
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The Editor-in-Chief has retracted this article [1] because it substantially overlaps with the following articles (among others) [2,3,4,5]. [Author Abdelmajid Lassoued does not agree to this retraction and none of the other authors have responded to any correspondence from the editor or publisher about this retraction.]
[1] Lassoued, A., Lassoued, M.S., García-Granda, S. et al. Synthesis and characterization of Ni-doped a-Fe2O3 nanoparticles through co-precipitation method with enhanced photocatalytic activities. J Mater Sci: Mater Electron 29, 5726–5737 (2018). https://doi.org/10.1007/s10854-018-8543-0
[2] Lassoued, A., Lassoued, M.S., Dkhil, B. et al. Structural, optical and morphological characterization of Cu-doped a-Fe2O3 nanoparticles synthesized through co-precipitation technique. Journal of Molecular Structure 1148, 276-281 (2017). https://doi.org/10.1016/j.molstruc.2017.07.051
[3] Lassoued, A., Lassoued, M.S., Karolak, F. et al. Synthesis, structural, optical, morphological and magnetic characterization of copper substituted nickel ferrite (CuxNi1-xFe2O4) through co-precipitation method. J Mater Sci: Mater Electron 28, 18480–18488 (2017). https://doi.org/10.1007/s10854-017-7795-4
[4] Bargougui, R., Oueslati, A., Schmerber, G. et al. Structural, optical and electrical properties of Zn-doped SnO2 nanoparticles synthesized by the co-precipitation technique. J Mater Sci: Mater Electron 25, 2066–2071 (2014). https://doi.org/10.1007/s10854-014-1841-2
[5] Lassoued, A., Ben hassine, M., Karolak, F. et al. Synthesis and magnetic characterization of Spinel ferrites MFe2O4 (M?=?Ni, Co, Zn and Cu) via chemical co-precipitation method. J Mater Sci: Mater Electron 28, 18857–18864 (2017). https://doi.org/10.1007/s10854-017-7837-y
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Lassoued, A., Lassoued, M.S., García-Granda, S. et al. RETRACTED ARTICLE: Synthesis and characterization of Ni-doped α-Fe2O3 nanoparticles through co-precipitation method with enhanced photocatalytic activities. J Mater Sci: Mater Electron 29, 5726–5737 (2018). https://doi.org/10.1007/s10854-018-8543-0
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DOI: https://doi.org/10.1007/s10854-018-8543-0