Photocatalytic degradation of trichloroethylene on platinum ion-doped TiO2 under visible light irradiation

Photocatalytic degradation of trichloroethylene on platinum ion-doped TiO2 under visible light... Porous platinum ion-doped TiO2 (Pt–TiO2) was prepared by a sol–gel method and demonstrated to have superior photocatalytic activity for the photodegradation of gaseous trichloroethylene (TCE) under visible light (VL) irradiation from a xenon lamp equipped with 422-nm cut-off filter. Kinetic studies were performed to clarify the effect of the doping amounts, space times, VL intensity, and mole fractions of TCE, O2, and H2O on the degradation of TCE. Under ultraviolet (UV) irradiation, the photocatalytic activity of Pt–TiO2 was the same as that of TiO2, indicating that the doped Pt ion did not act as a recombination center for the photogenerated holes and electrons. Based on the kinetic data and reaction products, we conclude that the photocatalytic degradation of TCE on Pt–TiO2 under VL irradiation proceeds similarly to TiO2 under UV irradiation. We also performed the photocatalytic degradation of TCE at the space time of 7.5 × 107 g s mol−1 in a tubular reactor packed with the Pt–TiO2 pellets which are more suitable than the Pt–TiO2 powder for the practical remediation of the contaminated gas. TCE was completely degraded, i.e. 100% conversion was achieved under VL irradiation but only a small quantity of CO2 was formed with the stoichiometric ratio of [CO2]formed/[TCE]degraded of ca. 0.33. By switching the gas stream containing TCE to humid air, more CO2 was formed, indicating that the dichloroacetates accumulated on the Pt–TiO2 surface are photodegradable to CO2 under VL irradiation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Research on Chemical Intermediates Springer Journals

Photocatalytic degradation of trichloroethylene on platinum ion-doped TiO2 under visible light irradiation

Photocatalytic degradation of trichloroethylene on platinum ion-doped TiO2 under visible light irradiation

Res Chem Intermed (2017) 43:5025–5039 DOI 10.1007/s11164-017-3051-z Photocatalytic degradation of trichloroethylene on platinum ion-doped TiO under visible light irradiation 1 1 • • Tomoaki Seyama Toshifumi Tanimura 1 1 Keigo Tashiro Suzuko Yamazaki Received: 8 December 2016 / Accepted: 23 April 2017 / Published online: 21 July 2017 Springer Science+Business Media B.V. 2017 Abstract Porous platinum ion-doped TiO (Pt–TiO ) was prepared by a sol–gel 2 2 method and demonstrated to have superior photocatalytic activity for the pho- todegradation of gaseous trichloroethylene (TCE) under visible light (VL) irradia- tion from a xenon lamp equipped with 422-nm cut-off filter. Kinetic studies were performed to clarify the effect of the doping amounts, space times, VL intensity, and mole fractions of TCE, O , and H O on the degradation of TCE. Under ultraviolet 2 2 (UV) irradiation, the photocatalytic activity of Pt–TiO was the same as that of TiO , indicating that the doped Pt ion did not act as a recombination center for the photogenerated holes and electrons. Based on the kinetic data and reaction products, we conclude that the photocatalytic degradation of TCE on Pt–TiO under VL irradiation proceeds similarly to TiO under UV irradiation. We also performed the 7 -1 photocatalytic degradation of TCE at the space time of 7.5 9 10 g s mol in a tubular reactor packed with the Pt–TiO pellets which are more suitable than the Pt– TiO powder for the practical remediation of the contaminated gas. TCE was completely degraded, i.e. 100% conversion was achieved under VL irradiation but only a small quantity of CO was formed with the stoichiometric ratio of [CO ]- 2 2 /[TCE] of ca. 0.33. By switching the gas stream containing TCE to formed degraded humid air, more CO was formed, indicating that the dichloroacetates accumulated on the Pt–TiO surface are photodegradable to CO under VL irradiation. 2 2 Special Issue of the 1st...
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Publisher
Springer Netherlands
Copyright
Copyright © 2017 by Springer Science+Business Media B.V.
Subject
Chemistry; Catalysis; Physical Chemistry; Inorganic Chemistry
ISSN
0922-6168
eISSN
1568-5675
D.O.I.
10.1007/s11164-017-3051-z
Publisher site
See Article on Publisher Site

Abstract

Porous platinum ion-doped TiO2 (Pt–TiO2) was prepared by a sol–gel method and demonstrated to have superior photocatalytic activity for the photodegradation of gaseous trichloroethylene (TCE) under visible light (VL) irradiation from a xenon lamp equipped with 422-nm cut-off filter. Kinetic studies were performed to clarify the effect of the doping amounts, space times, VL intensity, and mole fractions of TCE, O2, and H2O on the degradation of TCE. Under ultraviolet (UV) irradiation, the photocatalytic activity of Pt–TiO2 was the same as that of TiO2, indicating that the doped Pt ion did not act as a recombination center for the photogenerated holes and electrons. Based on the kinetic data and reaction products, we conclude that the photocatalytic degradation of TCE on Pt–TiO2 under VL irradiation proceeds similarly to TiO2 under UV irradiation. We also performed the photocatalytic degradation of TCE at the space time of 7.5 × 107 g s mol−1 in a tubular reactor packed with the Pt–TiO2 pellets which are more suitable than the Pt–TiO2 powder for the practical remediation of the contaminated gas. TCE was completely degraded, i.e. 100% conversion was achieved under VL irradiation but only a small quantity of CO2 was formed with the stoichiometric ratio of [CO2]formed/[TCE]degraded of ca. 0.33. By switching the gas stream containing TCE to humid air, more CO2 was formed, indicating that the dichloroacetates accumulated on the Pt–TiO2 surface are photodegradable to CO2 under VL irradiation.

Journal

Research on Chemical IntermediatesSpringer Journals

Published: Jul 21, 2017

References

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