Photocatalytic activity and luminescence properties of RE3+-TiO2 nanocrystals prepared by sol-gel and hydrothermal methods

Joanna Reszczyńska , Tomasz Grzyb , Zhishun Wei , Marek Klein , Ewa Kowalska , Bunsho Ohtani , Adriana Zaleska-Medynska

Abstract

A series of Y3+, Pr3+, Er3+ and Eu3+ modified TiO2 photocatalysts were obtained via sol–gel (SG) and hydrothermal (HT) methods. Samples prepared this way were characterized by X-ray powder diffractometry (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS), scanning transmission microscopy (STEM), BET surface area method and luminescence spectroscopy. The photocatalytic activity of the synthesized samples was evaluated by the degradation of phenol in aqueous solution under visible and ultraviolet light irradiations. Phenol in aqueous solutions was successfully decomposed under visible light (λ > 420 nm) using TiO2 modified with RE ions. Luminescence properties of the samples as well as XRD and XPS analyses, indicate that RE are rather in the form of their oxides than in the form of cations in the crystal structure of TiO2. Photocatalysts prepared by SG method possessed higher amount of RE2O3, fewer of OH− groups and Ti3+ species on the surface layer than powders obtained by HT method. Action spectra analysis showed that Pr3+-modified TiO2 could be excited under visible light in the 420–250 nm range. Furthermore, photocatalysts obtained by HT method showed higher photocatalytic activity and lower intensity of luminescence emission than photocatalyst prepared by SG method.
Author Joanna Reszczyńska PFotokatalizy
Joanna Reszczyńska,,
- Laboratory of Photocatalysis
, Tomasz Grzyb
Tomasz Grzyb,,
-
, Zhishun Wei
Zhishun Wei,,
-
, Marek Klein
Marek Klein,,
-
, Ewa Kowalska
Ewa Kowalska,,
-
, Bunsho Ohtani
Bunsho Ohtani,,
-
, Adriana Zaleska-Medynska PFotokatalizy
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
Journal seriesApplied Catalysis B: Environmental, ISSN 0926-3373
Issue year2016
Vol181
Pages825-837
Publication size in sheets0.6
Keywords in EnglishTiO2, heterogeneous photocatalysis, sol-gel method, hydrothermal method, rare earth metal
DOIDOI:10.1016/j.apcatb.2015.09.001
URL http://dx.doi.org/doi:10.1016/j.apcatb.2015.09.001
Languageen angielski
Score (nominal)45
ScoreMinisterial score = 45.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 9.446 (2) - 2016=8.87 (5)
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