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Influence of the preparation method on the photocatalytic activity of Nd-modified TiO2
- Source :
- Beilstein Journal of Nanotechnology, Vol 9, Iss 1, Pp 447-459 (2018)
- Publication Year :
- 2018
- Publisher :
- Beilstein-Institut, 2018.
-
Abstract
- Nd-modified TiO2 photocatalysts 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 TiO2 is 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-TiO2 and scavenger confirm that superoxide radicals were responsible for the visible light-induced degradation of the model pollutant in aqueous solution.
Details
- Language :
- English
- ISSN :
- 21904286
- Volume :
- 9
- Issue :
- 1
- Database :
- Directory of Open Access Journals
- Journal :
- Beilstein Journal of Nanotechnology
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.b6e3ceeddc6344298dfb90848a8b3760
- Document Type :
- article
- Full Text :
- https://doi.org/10.3762/bjnano.9.43