Preparation and photocatalytic activity of Nd-modified TiO2 photocatalysts: insight into the excitation mechanism under visible light

Patrycja Parnicka , Paweł Mazierski , Tomasz Grzyb , Zhishun Wei , Ewa Kowalska , Wojciech Lisowski , Tomasz Klimczuk , Joanna Nadolna

Abstract

Titanium dioxide (TiO2) nanoparticles (NPs) modified with neodymium (Nd) in the range between 0.1 and 1.0 mol% were prepared via the hydrothermal method. The samples obtained were characterized by diffuse reflectance spectroscopy (DRS), scanning electron microscopy (SEM), X-ray fluorescence (EDX), Brunauer–Emmett–Teller (BET) method, X-ray powder diffraction analysis (XRD), X-ray photoelectron spectroscopy (XPS) and photoluminescence spectroscopy (PL). The photocatalytic activity of the obtained samples was evaluated by photodegradation of phenol in aqueous solution under ultraviolet–visible (UV–Vis, λ > 350 nm) and visible (Vis, λ > 420 nm) irradiation. Experimental results showed that the photocatalysts exhibited high photocatalytic activity under Vis light. The sample showing the highest photoactivity under Vis irradiation was in the form of anatase; its surface area equalled 124 m2/g (1.16 times larger than that of pristine TiO2). The average crystal size was 10.9 nm, and it was modified with 0.1 mol% of Nd3+ (28% of phenol was degraded after 60 min of irradiation). The photocatalytic tests of phenol degradation in the presence of scavengers confirm that e− and were responsible for the visible light degradation of organic compounds in the aqueous phase. Action spectra analysis revealed that although Nd-modified TiO2 could be excited under visible light in the range of 400–480 nm, the up-conversion process is not responsible for the degradation of phenol under Vis irradiation.
Author Patrycja Parnicka (FCh / DET / LPh)
Patrycja Parnicka,,
- Laboratory of Photocatalysis
, Paweł Mazierski (FCh / DET / LPh)
Paweł Mazierski ,,
- Laboratory of Photocatalysis
, Tomasz Grzyb
Tomasz Grzyb,,
-
, Zhishun Wei
Zhishun Wei,,
-
, Ewa Kowalska
Ewa Kowalska,,
-
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Tomasz Klimczuk
Tomasz Klimczuk,,
-
, Joanna Nadolna (FCh / DET / LPh)
Joanna Nadolna,,
- Laboratory of Photocatalysis
Journal seriesJournal of Catalysis, ISSN 0021-9517, (A 40 pkt)
Issue year2017
Vol353
Pages211-222
Publication size in sheets0.55
Keywords in Englishheterogeneous photocatalysis, TiO2, Modified-TiO2, rare earth metal, neodymium, visible light photoactivity, phenol degradation, action spectra analysis
DOIDOI:10.1016/j.jcat.2017.07.017
URL https://doi.org/10.1016/j.jcat.2017.07.017
Languageen angielski
Score (nominal)45
ScoreMinisterial score = 40.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 6.844 (2) - 2016=7.61 (5)
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