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

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

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 favors 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 [BMIM][Br] ionic liquid for IL 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.

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Authors

Details

Category:
Articles
Type:
artykuł w czasopiśmie wyróżnionym w JCR
Published in:
CHEMCATCHEM no. 9, pages 4377 - 4388,
ISSN: 1867-3880
Language:
English
Publication year:
2017
Bibliographic description:
Łuczak J., Paszkiewicz-Gawron M., Długokęcka M., Lisowski, W., Grabowska E., Makurat S., Rak J., Zaleska-Medynska A.: Visible light photocatalytic activity of ionic liquid-TiO2 spheres: effect of the ionic liquid's anion structure// CHEMCATCHEM. -Vol. 9, nr. 23 (2017), s.4377-4388
DOI:
Digital Object Identifier (open in new tab) 10.1002/cctc.201700861
Verified by:
Gdańsk University of Technology

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