Reprint of “Studies on the adsorption and photocatalytic degradation of an EuIII(TTFA)3(MePhTerpy) complex on the TiO2 surface”

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Authors

  • S. Melchers
  • Y. Alsalka
  • J. Schneider
  • D.W. Bahnemann

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Original languageEnglish
Pages (from-to)91-96
Number of pages6
JournalJournal of Photochemistry and Photobiology A: Chemistry
Volume366
Early online date29 Sept 2018
Publication statusPublished - 1 Nov 2018

Abstract

The luminescent dye Europium III(thenoyltrifluoroacetone)(4′-(4-methylphenyl)-2,2′:6′,2″-terpyridine) (Eu III(TTFA) 3(MePhTerpy)) has been proposed as a probe molecule for a fast photocatalytic test of TiO 2-materials. For an industrial application of this test method the underlying photocatalytic reaction mechanism and the degradation products of the dye need to be known. Hence, in this study the adsorption and the photocatalytic degradation of the luminescent dye on the TiO 2 surface were investigated by means of ATR-FTIR spectroscopy and GC/MS analysis. The dye is adsorbed by the thenoyltrifluoroacetone (TTFA) ligand on the TiO 2 surface as evinced by the respective ATR-FTIR spectra. It is assumed that TTFA and TiO 2 form hydrogen bonds. Upon UV illumination the ATR-FTIR spectra reveal a degradation of the TTFA ligand forming trifluoroacetic acid (TFAA) and 2-thiophenecarboxylic acid (TCA). GC/MS analysis confirms the ATR-FTIR results because TCA and TFAA are also detected here. Additionally, 2-thiophenecarboxaldehyde is observed, which is proposed to be an intermediate that is further oxidized to TCA.

Keywords

    Degradation, Dye, Europium complex, Luminescence, Photocatalysis, TiO

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Reprint of “Studies on the adsorption and photocatalytic degradation of an EuIII(TTFA)3(MePhTerpy) complex on the TiO2 surface”. / Melchers, S.; Alsalka, Y.; Schneider, J. et al.
In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 366, 01.11.2018, p. 91-96.

Research output: Contribution to journalArticleResearchpeer review

Melchers S, Alsalka Y, Schneider J, Bahnemann DW. Reprint of “Studies on the adsorption and photocatalytic degradation of an EuIII(TTFA)3(MePhTerpy) complex on the TiO2 surface”. Journal of Photochemistry and Photobiology A: Chemistry. 2018 Nov 1;366:91-96. Epub 2018 Sept 29. doi: 10.1016/j.jphotochem.2018.09.022
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title = "Reprint of “Studies on the adsorption and photocatalytic degradation of an EuIII(TTFA)3(MePhTerpy) complex on the TiO2 surface”",
abstract = "The luminescent dye Europium III(thenoyltrifluoroacetone)(4′-(4-methylphenyl)-2,2′:6′,2″-terpyridine) (Eu III(TTFA) 3(MePhTerpy)) has been proposed as a probe molecule for a fast photocatalytic test of TiO 2-materials. For an industrial application of this test method the underlying photocatalytic reaction mechanism and the degradation products of the dye need to be known. Hence, in this study the adsorption and the photocatalytic degradation of the luminescent dye on the TiO 2 surface were investigated by means of ATR-FTIR spectroscopy and GC/MS analysis. The dye is adsorbed by the thenoyltrifluoroacetone (TTFA) ligand on the TiO 2 surface as evinced by the respective ATR-FTIR spectra. It is assumed that TTFA and TiO 2 form hydrogen bonds. Upon UV illumination the ATR-FTIR spectra reveal a degradation of the TTFA ligand forming trifluoroacetic acid (TFAA) and 2-thiophenecarboxylic acid (TCA). GC/MS analysis confirms the ATR-FTIR results because TCA and TFAA are also detected here. Additionally, 2-thiophenecarboxaldehyde is observed, which is proposed to be an intermediate that is further oxidized to TCA. ",
keywords = "Degradation, Dye, Europium complex, Luminescence, Photocatalysis, TiO",
author = "S. Melchers and Y. Alsalka and J. Schneider and D.W. Bahnemann",
note = "Funding Information: This work was funded by the German Federal Ministry of Education and Research (contract no. 13N13350, PureBau – Untersuchung von Werkstoffsystemen f{\"u}r photokatalytisch hocheffiziente Baustoffe- Teilvorhaben: Oberfl{\"a}chenchemie der Photokatalysatoren und der Werkstoffe). Furthermore, Y. Alsalka gratefully acknowledges the financial support from the DAAD (Deutscher Akademischer Austauschdienst) . Additionally, we thank KRONOS {\textregistered} for providing the TiO 2 materials and Dr. Johannes from the Technische Universit{\"a}t Braunschweig for the synthesis of the dye.",
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AU - Melchers, S.

AU - Alsalka, Y.

AU - Schneider, J.

AU - Bahnemann, D.W.

N1 - Funding Information: This work was funded by the German Federal Ministry of Education and Research (contract no. 13N13350, PureBau – Untersuchung von Werkstoffsystemen für photokatalytisch hocheffiziente Baustoffe- Teilvorhaben: Oberflächenchemie der Photokatalysatoren und der Werkstoffe). Furthermore, Y. Alsalka gratefully acknowledges the financial support from the DAAD (Deutscher Akademischer Austauschdienst) . Additionally, we thank KRONOS ® for providing the TiO 2 materials and Dr. Johannes from the Technische Universität Braunschweig for the synthesis of the dye.

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N2 - The luminescent dye Europium III(thenoyltrifluoroacetone)(4′-(4-methylphenyl)-2,2′:6′,2″-terpyridine) (Eu III(TTFA) 3(MePhTerpy)) has been proposed as a probe molecule for a fast photocatalytic test of TiO 2-materials. For an industrial application of this test method the underlying photocatalytic reaction mechanism and the degradation products of the dye need to be known. Hence, in this study the adsorption and the photocatalytic degradation of the luminescent dye on the TiO 2 surface were investigated by means of ATR-FTIR spectroscopy and GC/MS analysis. The dye is adsorbed by the thenoyltrifluoroacetone (TTFA) ligand on the TiO 2 surface as evinced by the respective ATR-FTIR spectra. It is assumed that TTFA and TiO 2 form hydrogen bonds. Upon UV illumination the ATR-FTIR spectra reveal a degradation of the TTFA ligand forming trifluoroacetic acid (TFAA) and 2-thiophenecarboxylic acid (TCA). GC/MS analysis confirms the ATR-FTIR results because TCA and TFAA are also detected here. Additionally, 2-thiophenecarboxaldehyde is observed, which is proposed to be an intermediate that is further oxidized to TCA.

AB - The luminescent dye Europium III(thenoyltrifluoroacetone)(4′-(4-methylphenyl)-2,2′:6′,2″-terpyridine) (Eu III(TTFA) 3(MePhTerpy)) has been proposed as a probe molecule for a fast photocatalytic test of TiO 2-materials. For an industrial application of this test method the underlying photocatalytic reaction mechanism and the degradation products of the dye need to be known. Hence, in this study the adsorption and the photocatalytic degradation of the luminescent dye on the TiO 2 surface were investigated by means of ATR-FTIR spectroscopy and GC/MS analysis. The dye is adsorbed by the thenoyltrifluoroacetone (TTFA) ligand on the TiO 2 surface as evinced by the respective ATR-FTIR spectra. It is assumed that TTFA and TiO 2 form hydrogen bonds. Upon UV illumination the ATR-FTIR spectra reveal a degradation of the TTFA ligand forming trifluoroacetic acid (TFAA) and 2-thiophenecarboxylic acid (TCA). GC/MS analysis confirms the ATR-FTIR results because TCA and TFAA are also detected here. Additionally, 2-thiophenecarboxaldehyde is observed, which is proposed to be an intermediate that is further oxidized to TCA.

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KW - Dye

KW - Europium complex

KW - Luminescence

KW - Photocatalysis

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JO - Journal of Photochemistry and Photobiology A: Chemistry

JF - Journal of Photochemistry and Photobiology A: Chemistry

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