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Adsorption
Published in: Adsorption 2-4/2013

01-04-2013

Enhanced and suppressed effects of ionic liquid on the photocatalytic activity of TiO2

Authors: Lifang Qi, Jiaguo Yu, Mietek Jaroniec

Published in: Adsorption | Issue 2-4/2013

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Abstract

The effects of a room temperature ionic liquid, 1-butyl-3-methylimidazolium terafluoroborate ([Bmim]BF4), on the photocatalytic performance of Degussa P25 TiO2 were investigated. Also, the photocatalysis mechanism was systematically analyzed by conducting different reactive radical trapping experiments. The results showed that photogenerated electrons were the main reactive species involved in the photocatalytic degradation of methyl orange (MO), while •OH radicals and photogenerated holes played an important role in the photocatalytic decomposition of rhodamine B (RhB). The addition of ionic liquid (IL) could slightly enhance the photocatalytic degradation rate of MO because adsorption of [Bmim]+ ions on the TiO2 surface not only enhanced traping and transfer of photogenerated electrons, but also facilitated adsorption of negatively charged MO. On the contrary, IL suppressed the degradation rate of RhB because [Bmim]+ on the TiO2 surface not only hindered the access of positively charged RhB to TiO2, but also restricted the diffusion of positively charged holes to the TiO2/solution interface.
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Metadata
Title
Enhanced and suppressed effects of ionic liquid on the photocatalytic activity of TiO2
Authors
Lifang Qi
Jiaguo Yu
Mietek Jaroniec
Publication date
01-04-2013
Publisher
Springer US
Published in
Adsorption / Issue 2-4/2013
Print ISSN: 0929-5607
Electronic ISSN: 1572-8757
DOI
https://doi.org/10.1007/s10450-013-9478-7

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