Influence of the preparation method on the photocatalytic activity of Nd-modified TiO2

Beilstein Journal of Nanotechnology

Joanna Nadolna¹  Paweł Mazierski¹  Adriana Zaleska-Medynska¹  Patrycja Parnicka¹  Tomasz Grzyb²  Bunsho Ohtani³  Ewa Kowalska³  Wojciech Lisowski⁴ 

[1] Department of Environmental Technology, University of Gdansk, 80-308 Gdansk, Poland;Department of Rare Earths, Faculty of Chemistry, Adam Mickiewicz University in Poznan, 60-780 Poznan, Poland;Institute for Catalysis, Hokkaido University, Sapporo 001-0021, Japan;Institute of Physical Chemistry, Polish Academy of Sciences,01-224 Warsaw, Poland;

关键词: heterogeneous photocatalysis;    hydrothermal method;    modified TiO2;    neodymium;    sol–hydrothermal method;   

DOI  :  10.3762/bjnano.9.43

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown