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Sol–gel preparation and characterization of Ag and Mg co-doped nano TiO2: efficient photocatalytic degradation of C.I. Acid Red 27

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Abstract

In this study, we successfully prepared pure, mono-doped, and Ag, Mg co-doped TiO2 nanoparticles using the sol–gel method, with titanium tetraisopropoxide as the Ti source. The prepared samples were characterized by X-ray powder diffraction (XRD), specific surface area and porosity (BET and BJH) measurement, scanning electron microscopy, transmission electron microscopy, X-ray photoelectron spectroscopy, photoluminescence, and energy dispersive X-ray spectroscopy techniques. The XRD data showed that the prepared nanoparticles had the same crystals structures as the pure TiO2. Also, DRS results indicated that the band gap of co-doped photocatalyst was smaller than that of the monometallic and undoped TiO2 and that there was a shift in the absorption band towards the visible light region. Furthermore, the photocatalytic activity of the prepared catalysts was evaluated by the degradation of C.I. Acid Red 27 in aqueous solution under visible light irradiation. The results showed that Ag (0.08 mol%), Mg (0.2 mol%) co-doped TiO2 had the highest photoactivity among all samples under visible light. It was concluded that co-doping of the Ag and Mg can significantly improve the photocatalytic activity of the prepared photocatalysts, due to the efficient inhibition of the recombination of photogenerated electron–hole pairs. The optimum calcination temperature and time were 450 °C and 3 h, respectively.

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Acknowledgments

The authors would like to gratefully acknowledge the support of Islamic Azad University, North Tehran Branch.

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Authors and Affiliations

  1. Department of Applied Chemistry, North Tehran Branch, Islamic Azad University, Tehran, Iran

    Jila Talat-Mehrabad & Morteza Khosravi

  2. Department of Chemistry, Tabriz Branch, Islamic Azad University, Tabriz, Iran

    Nasser Modirshahla & Mohammad A. Behnajady

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  1. Jila Talat-Mehrabad
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  2. Morteza Khosravi
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  3. Nasser Modirshahla
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  4. Mohammad A. Behnajady
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Correspondence to Morteza Khosravi.

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Talat-Mehrabad, J., Khosravi, M., Modirshahla, N. et al. Sol–gel preparation and characterization of Ag and Mg co-doped nano TiO2: efficient photocatalytic degradation of C.I. Acid Red 27. Res Chem Intermed 42, 595–609 (2016). https://doi.org/10.1007/s11164-015-2044-z

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  • DOI: https://doi.org/10.1007/s11164-015-2044-z

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