Experimental and computational study of Tm-doped TiO2: the effect of Li+ on Vis-response photocatalysis and luminescence

Paweł Mazierski , Pablo Nicolás Arellano Caicedo , Tomasz Grzyb , Alicja Mikołajczyk , Juganta K. Roy , Ewelina Wyrzykowska , Zhishun Wei , Ewa Kowalska , Tomasz Puzyn , Adriana Zaleska-Medynska , Joanna Nadolna

Abstract

The utilization of solar light to induce a photocatalytic reaction in the presence of wide band gap semiconductors requires the modification of their surface and optical properties. The Vis-to-UV up-conversion process (UCP) that occurs in lanthanide ions could be employed to induce TiO2. Thus, having in mind solar-forced photocatalysis, nanostructured TiO2 co-modified with Tm and Li was prepared via a hydrothermal method. In addition to the exhaustive surface characterization of the as-prepared samples, the partial density of states (PDOS) was computed to better understand the electronic structure and physicochemical properties of the prepared photocatalysts. It was demonstrated that Tm ions were beneficial for phenol degradation in the aqueous phase under visible irradiation, whereas the co-presence of Tm and Li ions was profitable for enhanced luminescence. Although action spectra revealed that excitation of Tm-TiO2 in the range from 400 to 490 nm led to the photodegradation of phenol and 2-propanol, the UCP was not responsible for the photocatalytic activity under Vis irradiation. Therefore, it is proposed that the formation of sub-band gap states from the lanthanide 4f level played a key role in the phenol degradation process.
Author Paweł Mazierski (FCh / DET / LPh)
Paweł Mazierski ,,
- Laboratory of Photocatalysis
, Pablo Nicolás Arellano Caicedo (FCh / DET / LPh)
Pablo Nicolás Arellano Caicedo,,
- Laboratory of Photocatalysis
, Tomasz Grzyb
Tomasz Grzyb,,
-
, Alicja Mikołajczyk (FCh / DET / LPh)
Alicja Mikołajczyk,,
- Laboratory of Photocatalysis
, Juganta K. Roy
Juganta K. Roy,,
-
, Ewelina Wyrzykowska (FCh / DEChR / LECh)
Ewelina Wyrzykowska,,
- Laboratory of Environmental Chemometrics
, Zhishun Wei
Zhishun Wei,,
-
, Ewa Kowalska
Ewa Kowalska,,
-
, Tomasz Puzyn (FCh / DEChR / LECh)
Tomasz Puzyn,,
- Laboratory of Environmental Chemometrics
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
et al.`
Journal seriesApplied Catalysis B: Environmental, ISSN 0926-3373, (A 45 pkt)
Issue year2019
Vol252
Pages138-151
Publication size in sheets0.65
Keywords in EnglishTiO2, thulium, lithium, visible light, PDOS
ASJC Classification1508 Process Chemistry and Technology; 2300 General Environmental Science; 1503 Catalysis
DOIDOI:10.1016/j.apcatb.2019.03.051
URL https://doi.org/10.1016/j.apcatb.2019.03.051
Languageen angielski
Score (nominal)45
ScoreMinisterial score = 45.0, 16-07-2019, ArticleFromJournal
Ministerial score (2013-2016) = 45.0, 16-07-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2016 = 2.12; WoS Impact Factor: 2017 = 11.698 (2) - 2017=10.212 (5)
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