Dependence between ionic liquid structure and mechanism of visible-light-induced activity of TiO2 obtained by ionic-liquid-assisted solvothermal synthesis

Marta Paszkiewicz-Gawron , Marta Długokęcka , Wojciech Lisowski , Maria Cristina Paganini , Elio Giamello , Tomasz Klimczuk , Monika Paszkiewicz , Ewelina Grabowska , Adriana Zaleska-Medynska , Justyna Łuczak

Abstract

Because of the tremendous structural diversity of ionic liquids (ILs), simple transfer of observations performed for one IL used for IL-TiO2 preparation on different samples is not possible. Therefore, four ionic liquids, all containing distinct nitrogen-bearing organic cations (pyridinium, pyrrolidinium, ammonium, imidazolium), were used for the first time for the preparation of IL-TiO2 composites. The role of the individual IL cation in the synthesis of TiO2 microspheres, as well as the effect of the IL structure on the mechanism of the visible-light (Vis)-induced photoactivity of IL-TiO2 was presented and discussed in regard to structure, morphology, absorption properties, elemental composition, and reactive species involved in the photocatalytic reaction of phenol degradation. The successful modification of the TiO2 with organic IL species including possible interactions between IL and TiO2 surface, as well as the TiO2 matrix (doping with N), were confirmed. The sample that exhibited the highest photoactivity under Vis irradiation (58%) was TiO2 prepared in a presence of 1-butylpyridinium chloride with a IL:precursor molar ratio of 1:3. For this sample, the highest partial decomposition of cationic species of IL was observed resulting in interaction of N atoms with deeper sites of TiO2 (Ti-Nx) as well as the highest surface defects in a form of Ti3+. The superoxide radical species O2• – were found to be main active species responsible for high efficiency of degradation under Vis irradiation.
Author Marta Paszkiewicz-Gawron (FCh / DET / LPh)
Marta Paszkiewicz-Gawron ,,
- Laboratory of Photocatalysis
, Marta Długokęcka
Marta Długokęcka,,
-
, Wojciech Lisowski
Wojciech Lisowski,,
-
, Maria Cristina Paganini
Maria Cristina Paganini,,
-
, Elio Giamello
Elio Giamello,,
-
, Tomasz Klimczuk
Tomasz Klimczuk,,
-
, Monika Paszkiewicz (FCh / DEA / PAiMŚ)
Monika Paszkiewicz,,
- Pracownia Analityki i Monitoringu Środowiska
, Ewelina Grabowska (FCh / DET / LPh)
Ewelina Grabowska,,
- Laboratory of Photocatalysis
, Adriana Zaleska-Medynska (FCh / DET / LPh)
Adriana Zaleska-Medynska,,
- Laboratory of Photocatalysis
, Justyna Łuczak
Justyna Łuczak,,
-
Journal seriesACS Sustainable Chemistry & Engineering, ISSN 2168-0485, (A 40 pkt)
Issue year2018
Vol6
No3
Pages3927-3937
Keywords in Englishionic liquid, photocatalysis, titanium dioxide, visible light activity, surface interactions, N-doping
DOIDOI:10.1021/acssuschemeng.7b04291
URL http://pubs.acs.org/doi/pdf/10.1021/acssuschemeng.7b04291
Languageen angielski
Score (nominal)40
ScoreMinisterial score = 40.0, 20-06-2018, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 20-06-2018, ArticleFromJournal
Publication indicators WoS Impact Factor: 2016 = 5.951 (2) - 2016=6.079 (5)
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