Details
Original language | English |
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Pages (from-to) | 303-308 |
Number of pages | 6 |
Journal | Journal of Photochemistry and Photobiology A: Chemistry |
Volume | 364 |
Early online date | 8 Jun 2018 |
Publication status | Published - 1 Sept 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
ASJC Scopus subject areas
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In: Journal of Photochemistry and Photobiology A: Chemistry, Vol. 364, 01.09.2018, p. 303-308.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Studies on the adsorption and photocatalytic degradation of an EuIII(TTFA)3(MePhTerpy) complex on the TiO2 surface
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. 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
PY - 2018/9/1
Y1 - 2018/9/1
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.
KW - Degradation
KW - Dye
KW - Europium complex
KW - Luminescence
KW - Photocatalysis
KW - TiO
UR - http://www.scopus.com/inward/record.url?scp=85048528503&partnerID=8YFLogxK
U2 - 10.1016/j.jphotochem.2018.06.016
DO - 10.1016/j.jphotochem.2018.06.016
M3 - Article
VL - 364
SP - 303
EP - 308
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
SN - 1010-6030
ER -