Fabrication and photoactivity of ionic liquid-TiO2 structures for efficient visible-light-induced photocatalytic decomposition of organic pollutants in aqueous phase

Anna Gołąbiewska , Marta Paszkiewicz-Gawron , Aleksandra Sadzińska , Wojciech Lisowski , Ewelina Grabowska , Adriana Zaleska-Medynska , Justyna Łuczak

Abstract

To investigate the effect of the ionic liquid (IL) chain length on the surface properties and photoactivity of TiO2, a series of TiO2 microspheres have been synthesized via a solvothermal method assisted by 1-methyl-3-octadecylimidazolium chloride([ODMIM][Cl]) and 1-methyl-3-tetradecylimidazolium chloride ([TDMIM][Cl]). All as-prepared samples were characterized by X-ray powder diffraction (XRD), X-ray photoelectron spectroscopy (XPS), diffuse reflectance spectroscopy (DRS), scanning trans- mission microscopy (STEM) and the Brunauer–Emmett–Teller (BET) surface area method, whereas the photocatalytic activity was evaluated by the degradation of phenol in aqueous solution under visible light irradiation (λ > 420 nm). The highest photoefficiency (four times higher than pristine TiO2) was observed for the TiO2 sample obtained in the presence of [TDMIM][Cl] for a IL to TiO2 precursor molar ratio of 1:3. It was revealed that interactions between the ions of the ionic liquid and the surface of the growing titanium dioxide spheres results in a red-shift of absorption edge for the IL–TiO2 semiconductors. In this regard, the direct increase of the photoactivity of IL–TiO2 in comparison to pristine TiO2 was observed. The active species trapping experiments indicated that O2•− is the main active species, created at the surface of the IL–TiO2 material under visible-light illumination, and is responsible for the effective phenol degradation.
Author Anna Gołąbiewska PFotokatalizy
Anna Gołąbiewska,,
- Laboratory of Photocatalysis
, Marta Paszkiewicz-Gawron PFotokatalizy
Marta Paszkiewicz-Gawron ,,
- Laboratory of Photocatalysis
, Aleksandra Sadzińska
Aleksandra Sadzińska,,
-
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Ewelina Grabowska PFotokatalizy
Ewelina Grabowska,,
- Laboratory of Photocatalysis
, Adriana Zaleska-Medynska PFotokatalizy
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
, Justyna Łuczak
Justyna Łuczak,,
-
Journal seriesBeilstein Journal of Nanotechnology, ISSN 2190-4286
Issue year2018
Vol9
Pages580-590
Publication size in sheets0.5
Keywords in Englishheterogeneous photocatalysis, ionic liquids, TiO2, visible light catalysis
DOIDOI:10.3762/bjnano.9.54
URL https://www.beilstein-journals.org/bjnano/content/pdf/2190-4286-9-54.pdf
Languageen angielski
LicenseJournal (articles only); published final; Uznanie Autorstwa (CC-BY); with publication
Score (nominal)35
ScoreMinisterial score = 30.0, 02-07-2018, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 02-07-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 3.127 (2) - 2016=3.07 (5)
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