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
AbstractFormation 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).
|Journal series||Catalysts, ISSN 2073-4344, (N/A 100 pkt)|
|Publication size in sheets||0.55|
|Keywords in English||ionic liquids, apparent quantum efficiency, photocatalysis, DFT model, titanium dioxide, anions|
|License||Repository; published final; ; with publication|
|Score||= 100.0, 01-04-2020, ArticleFromJournal|
|Publication indicators||: 2018 = 0.912; : 2018 = 3.444 (2) - 2018=3.808 (5)|
|Licencja||Utwór jest udostępniany na licencji Creative Commons Uznanie autorstwa 4.0 Międzynarodowe (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/d|
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