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Synthesis and characterization of Co-doped nano-TiO2 through co-precipitation method for photocatalytic activity

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An Expression of Concern to this article was published on 08 May 2020

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Abstract

The aim of this work was synthesis and investigation of various properties of Co-doped titanium dioxide nanostructures. Synthesis was conducted by the co-precipitation method using cobalt nitrate and titanium isopropoxide as a precursor, followed by thermal treatment at a temperature of 500 °C. The materials were fully characterized using several techniques (X-ray diffraction XRD, SEM, FTIR, TGA/DTA, UV–Vis diffuse reflectance DRS and photoluminescence). However, dopant has no effect on XRD pattern of the host but it can influence on the various characteristics of host such as optical and electrical properties. The scanning electron microscopy was used to detect the morphology of synthesized nanoparticles which sizes changed with the altitude in the doping concentration to 6%. FTIR spectra exhibit broad peaks where anatase phases of TiO2 demonstrate very sharp UV–Vis band gap results showed the reduction in band gap from from 3.21 eV, for undoped TiO2, to 2.74 eV, for Co doped 6% TiO2. The photocatalytic activity of the samples were studied based on the degradation of methyl orange as a model compound, where the results showed that Co doped 6% TiO2 a good photocatalytic activity.

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  • 08 May 2020

    The Editor-in-Chief is issuing an editorial expression of concern regarding the article [1]. While the article presents novel information regarding the synthesis and properties of Co-doped titanium dioxide nanostructures, the Editor-in-Chief is concerned regarding the amount of overlap with [2,3] None of the authors have responded to any correspondence from the editor or publisher about this overlap or the Editorial Expression of Concern.

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Acknowledgements

Financial support from Unité de Recherche Electrochimie, Matériaux et Environnement UREME (UR17ES45), Faculté des Sciences de Gabès, Université de Gabès, Cité Erriadh, 6072 Gabès, Tunisie.

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Authors and Affiliations

  1. Unité de recherché Electrochimie, Matériaux et environnement UREME (UR17ES45), Faculté des Sciences de Gabès, Université de Gabès, Cité Erriadh, 6072, Gabès, Tunisia

    Mohamed Saber Lassoued, Abdelmajid Lassoued, Salah Ammar & Abdellatif Gadri

  2. Material and Environment Science Laboratory, Science Faculty of Sfax University, P. B 1171, 3000, Sfax, Tunisia

    Mohamed Saber Lassoued & Abdelhamid Ben Salah

  3. Department of Physical and Analytical Chemistry, Oviedo University-CINN, 33006, Oviedo, Spain

    Mohamed Saber Lassoued & Santiago García-Granda

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  1. Mohamed Saber Lassoued
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  2. Abdelmajid Lassoued
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  3. Salah Ammar
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  4. Abdellatif Gadri
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Correspondence to Mohamed Saber Lassoued.

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Lassoued, M.S., Lassoued, A., Ammar, S. et al. Synthesis and characterization of Co-doped nano-TiO2 through co-precipitation method for photocatalytic activity. J Mater Sci: Mater Electron 29, 8914–8922 (2018). https://doi.org/10.1007/s10854-018-8910-x

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