Visible light photocatalytic activity of ionic liquid-TiO2 spheres: effect of the ionic liquid's anion structure

Justyna Łuczak , Marta Paszkiewicz-Gawron , Marta Długokęcka , Wojciech Lisowski , Ewelina Grabowska , Samanta Makurat , Janusz Rak , Adriana Zaleska-Medynska

Abstract

The effect of the ionic liquid's (IL) anion type ([BIMIM][X], where X= [Br], [PF6] or [OctSO4]) and content on the morphology, surface properties and photoactivity of TiO2 obtained by solvothermal method has been systematically investigated. Our results revealed that the presence of [Br], [OctSO4] anions favor formation of anatase phase, while presence of [PF6] anion causes formation of mixture of anatase and Ti(OH)PO4 phases. The highest photocatalytic activity under visible radiation (approximately four times higher than pristine TiO2) was observed for the TiO2 sample grown in a presence of 1-butyl-3-methylimidazolium bromide for ionic liquid to TiO2 precursor molar ratio 1:2. Visible light induced phenol degradation was found to be realized mainly by oxygen radical anions, whereas the contributions of the other processes, involving reactions with trapped electrons, holes and hydroxyl radical, are limited in the overall reaction mechanism. Quantum chemical calculations concerning model of anatase vacancy suggest that charge transfer between the bromide anion and molecular oxygen interacting with the vacancy is a source of photoreactivity induced by visible photons.
Author Justyna Łuczak
Justyna Łuczak,,
-
, Marta Paszkiewicz-Gawron PFotokatalizy
Marta Paszkiewicz-Gawron ,,
- Laboratory of Photocatalysis
, Marta Długokęcka
Marta Długokęcka,,
-
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Ewelina Grabowska PFotokatalizy
Ewelina Grabowska,,
- Laboratory of Photocatalysis
, Samanta Makurat PSB
Samanta Makurat,,
- Laboratory of Biological Sensitizers
, Janusz Rak PSB
Janusz Rak,,
- Laboratory of Biological Sensitizers
, Adriana Zaleska-Medynska PFotokatalizy
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
Journal seriesChemcatchem, ISSN 1867-3880
Issue year2017
Vol9
No23
Pages4377-4388
Publication size in sheets0.65
Keywords in Englishionic liquids, IL-assisted synthesis, TiO2 particles, heterogeneous photocatalysis, IL-TiO2 interactions, charge transfer mechanism
DOIDOI:10.1002/cctc.201700861
URL http://onlinelibrary.wiley.com/doi/10.1002/cctc.201700861/epdf
Languageen angielski
Score (nominal)35
ScoreMinisterial score = 35.0, 20-12-2017, ArticleFromJournal
Ministerial score (2013-2016) = 35.0, 20-12-2017, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 4.803 (2) - 2016=4.765 (5)
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