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Mechanistic Features of the TiO2 Heterogeneous Photocatalysis of Arsenic and Uranyl Nitrate in Aqueous Suspensions Studied by the Stopped-Flow Technique

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Authors

  • J.M. Meichtry
  • I.K. Levy
  • H.H. Mohamed
  • R. Dillert
  • D.W. Bahnemann

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Original languageEnglish
Pages (from-to)885-892
Number of pages8
JournalCHEMPHYSCHEM
Volume17
Issue number6
Publication statusPublished - 16 Mar 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.

Keywords

    arsenic, heterogeneous catalysis, photocatalysis, stopped flow, uranium

ASJC Scopus subject areas

Cite this

Mechanistic Features of the TiO2 Heterogeneous Photocatalysis of Arsenic and Uranyl Nitrate in Aqueous Suspensions Studied by the Stopped-Flow Technique. / Meichtry, J.M.; Levy, I.K.; Mohamed, H.H. et al.
In: CHEMPHYSCHEM, Vol. 17, No. 6, 16.03.2016, p. 885-892.

Research output: Contribution to journal › Article › Research › peer review

Meichtry JM, Levy IK, Mohamed HH, Dillert R, Bahnemann DW, Litter MI. Mechanistic Features of the TiO2 Heterogeneous Photocatalysis of Arsenic and Uranyl Nitrate in Aqueous Suspensions Studied by the Stopped-Flow Technique. CHEMPHYSCHEM. 2016 Mar 16;17(6):885-892. doi: 10.1002/cphc.201500949
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title = "Mechanistic Features of the TiO2 Heterogeneous Photocatalysis of Arsenic and Uranyl Nitrate in Aqueous Suspensions Studied by the Stopped-Flow Technique",
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. ",
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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.

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