Theoretical and experimental studies on the visible light activity of TiO2 modified with halide-based ionic liquids

Marta Paszkiewicz-Gawron , Samanta Makurat , Janusz Rak , Magdalena Zdrowowicz , Wojciech Lisowski , Adriana Zaleska-Medynska , Ewa Kowalska , Paweł Mazierski , Justyna Łuczak


Formation of a surface complex between organic molecules and TiO2 is one of the possible strategies for the development of visible light-induced TiO2 photoactivity. Herein, three ionic liquids (ILs) with the same cation and different anions (1-butylpirydynium chloride/bromide/iodide) have been applied for the surface modification of TiO2 and to understand the role of anions in visible light-induced activity of ILs-TiO2 systems. Photocatalytic screening tests (the measurements of phenol photodegradation reaction rate) revealed that anion type affected visible light activity (λ > 420 nm) of TiO2 obtained by the ILs-assisted solvothermal method. Density functional theory (DFT) calculations demonstrated that interactions between halogen anions and oxygen vacancies (OV) on the surface of the TiO2 particles could be responsible for the specific wavelength-induced excitation and finally for the observed photoactivity of titania under visible light. Finally, our theoretical calculations have been proven by experiments using monochromatic light (the apparent quantum efficiency was measured) and the properties of obtained samples were characterized using scanning electron microscopy (SEM), X-ray powder diffraction analysis (XRD), UV-Vis spectroscopy and X-ray photoelectron spectroscopy (XPS).
Author Marta Paszkiewicz-Gawron (FCh / DET / LPh)
Marta Paszkiewicz-Gawron,,
- Laboratory of Photocatalysis
, Samanta Makurat (FCh / DPCh / LBS)
Samanta Makurat,,
- Laboratory of Biological Sensitizers
, Janusz Rak (FCh / DPCh / LBS)
Janusz Rak,,
- Laboratory of Biological Sensitizers
, Magdalena Zdrowowicz (FCh / DPCh / LBS)
Magdalena Zdrowowicz,,
- Laboratory of Biological Sensitizers
, Wojciech Lisowski
Wojciech Lisowski,,
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
, Ewa Kowalska
Ewa Kowalska,,
, Paweł Mazierski (FCh / DET / LPh)
Paweł Mazierski ,,
- Laboratory of Photocatalysis
, Justyna Łuczak
Justyna Łuczak,,
Journal seriesCatalysts, ISSN 2073-4344, (N/A 100 pkt)
Issue year2020
Publication size in sheets0.55
Article number371
Keywords in Englishionic liquids, apparent quantum efficiency, photocatalysis, DFT model, titanium dioxide, anions
ASJC Classification1503 Catalysis; 1606 Physical and Theoretical Chemistry
Languageen angielski
LicenseRepository; published final; Uznanie Autorstwa (CC-BY); with publication
Paszkiewicz_Gawron_Marta_Theoretical_and_experimental_2020.pdf 2.36 MB
Score (nominal)100
Score sourcejournalList
ScoreMinisterial score = 100.0, 01-04-2020, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2018 = 0.912; WoS Impact Factor: 2018 = 3.444 (2) - 2018=3.808 (5)
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LicencjaUtwór jest udostępniany na licencji Creative Commons Uznanie autorstwa 4.0 Międzynarodowe (CC BY 4.0)
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