Influence of the preparation method on the photocatalytic activity of Nd-modified TiO 2

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Abstract

© 2018 Parnicka et al. Nd-modified TiO2photocatalysts have been obtained via hydrothermal (HT) and sol-hydrothermal (SHT) methods. The as-prepared samples were characterized by X-ray diffraction (XRD), BET surface area measurements, scanning electron microscopy (SEM), diffuse reflectance spectroscopy (DRS), luminescence spectroscopy and X-ray photoelectron spectroscopy (XPS). The photocatalytic activity of the synthesized samples was evaluated by the degradation of phenol in aqueous solution under irradiation with UV-vis (λ > 350 nm) and vis (λ > 420 nm) light, as well as by the degradation of gaseous toluene under irradiation with vis (λmax= 415 nm) light. It was found that Nd-modified TiO2is an efficient photocatalyst for the degradation of phenol and toluene under visible light. XPS analysis revealed that the photocatalyst prepared via HT method contains a three-times higher amount of hydroxy groups at the surface layer and a two-times higher amount of surface defects than that obtained by the SHT method. The photocatalytic efficiency of phenol and toluene degradation under vis irradiation in the presence of 0.25% Nd-TiO2(HT) reached 0.62 and 3.36 μmol·dm-1·min-1, respectively. Photocatalytic activity tests in the presence of Nd-TiO2and scavenger confirm that superoxide radicals were responsible for the visible light-induced degradation of the model pollutant in aqueous solution.

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Parnicka, P., Mazierski, P., Grzyb, T., Lisowski, W., Kowalska, E., Ohtani, B., … Nadolna, J. (2018). Influence of the preparation method on the photocatalytic activity of Nd-modified TiO 2. Beilstein Journal of Nanotechnology, 9(1), 447–459. https://doi.org/10.3762/bjnano.9.43

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