Details
| Originalsprache | Englisch |
|---|---|
| Seiten (von - bis) | 885-892 |
| Seitenumfang | 8 |
| Fachzeitschrift | CHEMPHYSCHEM |
| Jahrgang | 17 |
| Ausgabenummer | 6 |
| Publikationsstatus | Veröffentlicht - 16 März 2016 |
Abstract
The dynamics of the transfer of electrons stored in TiO 2 nanoparticles to As III, As V, and uranyl nitrate in water was investigated by using the stopped-flow technique. Suspensions of TiO 2 nanoparticles with stored trapped electrons (e trap -) were mixed with solutions of acceptor species to evaluate the reactivity by following the temporal evolution of e trap - by the decrease in the absorbance at λ=600 nm. The results indicate that As V and As III cannot be reduced by e trap - under the reaction conditions. In addition, it was observed that the presence of As V and As III strongly modified the reaction rate between O 2 and e trap -: an increase in the rate was observed if As V was present and a decrease in the rate was observed in the presence of As III. In contrast with the As system, U VI was observed to react easily with e trap - and U IV formation was observed spectroscopically at λ=650 nm. The possible competence of U VI and NO 3 - for their reduction by e trap - was analyzed. The inhibition of the U VI photocatalytic reduction by O 2 could be attributed to the fast oxidation of U V and/or U IV.
ASJC Scopus Sachgebiete
- Physik und Astronomie (insg.)
- Atom- und Molekularphysik sowie Optik
- Chemie (insg.)
- Physikalische und Theoretische Chemie
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in: CHEMPHYSCHEM, Jahrgang 17, Nr. 6, 16.03.2016, S. 885-892.
Publikation: Beitrag in Fachzeitschrift › Artikel › Forschung › Peer-Review
}
TY - JOUR
T1 - Mechanistic Features of the TiO2 Heterogeneous Photocatalysis of Arsenic and Uranyl Nitrate in Aqueous Suspensions Studied by the Stopped-Flow Technique
AU - Meichtry, J.M.
AU - Levy, I.K.
AU - Mohamed, H.H.
AU - Dillert, R.
AU - Bahnemann, D.W.
AU - Litter, M.I.
N1 - Publisher Copyright: © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. Copyright: Copyright 2016 Elsevier B.V., All rights reserved.
PY - 2016/3/16
Y1 - 2016/3/16
N2 - The dynamics of the transfer of electrons stored in TiO 2 nanoparticles to As III, As V, and uranyl nitrate in water was investigated by using the stopped-flow technique. Suspensions of TiO 2 nanoparticles with stored trapped electrons (e trap -) were mixed with solutions of acceptor species to evaluate the reactivity by following the temporal evolution of e trap - by the decrease in the absorbance at λ=600 nm. The results indicate that As V and As III cannot be reduced by e trap - under the reaction conditions. In addition, it was observed that the presence of As V and As III strongly modified the reaction rate between O 2 and e trap -: an increase in the rate was observed if As V was present and a decrease in the rate was observed in the presence of As III. In contrast with the As system, U VI was observed to react easily with e trap - and U IV formation was observed spectroscopically at λ=650 nm. The possible competence of U VI and NO 3 - for their reduction by e trap - was analyzed. The inhibition of the U VI photocatalytic reduction by O 2 could be attributed to the fast oxidation of U V and/or U IV.
AB - The dynamics of the transfer of electrons stored in TiO 2 nanoparticles to As III, As V, and uranyl nitrate in water was investigated by using the stopped-flow technique. Suspensions of TiO 2 nanoparticles with stored trapped electrons (e trap -) were mixed with solutions of acceptor species to evaluate the reactivity by following the temporal evolution of e trap - by the decrease in the absorbance at λ=600 nm. The results indicate that As V and As III cannot be reduced by e trap - under the reaction conditions. In addition, it was observed that the presence of As V and As III strongly modified the reaction rate between O 2 and e trap -: an increase in the rate was observed if As V was present and a decrease in the rate was observed in the presence of As III. In contrast with the As system, U VI was observed to react easily with e trap - and U IV formation was observed spectroscopically at λ=650 nm. The possible competence of U VI and NO 3 - for their reduction by e trap - was analyzed. The inhibition of the U VI photocatalytic reduction by O 2 could be attributed to the fast oxidation of U V and/or U IV.
KW - arsenic
KW - heterogeneous catalysis
KW - photocatalysis
KW - stopped flow
KW - uranium
UR - http://www.scopus.com/inward/record.url?scp=84954290349&partnerID=8YFLogxK
U2 - 10.1002/cphc.201500949
DO - 10.1002/cphc.201500949
M3 - Article
VL - 17
SP - 885
EP - 892
JO - CHEMPHYSCHEM
JF - CHEMPHYSCHEM
SN - 1439-4235
IS - 6
ER -