Details
| Original language | English |
|---|---|
| Article number | 697 |
| Journal | CATALYSTS |
| Volume | 9 |
| Issue number | 8 |
| Early online date | 20 Aug 2019 |
| Publication status | Published - Aug 2019 |
Abstract
Although titanium dioxide gathers many of the required properties for its application in photocatalytic processes, its lack of activity in the visible range is a major hurdle yet to be overcome. Among different strategies, the post-synthesis modification of TiO 2 powders with organic compounds has already led to commercially available materials, such as KRONOClean 7000. In this work, we apply diffuse reflectance transient absorption spectroscopy on this visible-light active photocatalyst and study the dynamics of the charge carriers alternatively induced by UV or visible light laser irradiation, under inert or reactive atmospheres. Our results can be interpreted by considering the material as TiO 2 sensitized by an organic-based layer, in agreement with previous studies on it, and show that the oxidative power of the material is considerably diminished under visible light irradiation. By complementarily performing continuous visible light irradiation photocatalysis experiments in aerated aqueous suspensions, we show that, although the oxidation of methanol proceeds at a very slow rate, the oxidation of chlorpromazine occurs much faster thanks to its better suited redox potential.
Keywords
- Carbon-based modified TiO, Carbon-doped materials, Chlorpromazine, KRONOClean 7000, Transient absorption spectroscopy, Visible light driven photocatalysis
ASJC Scopus subject areas
- Chemical Engineering(all)
- Catalysis
- Chemistry(all)
- Physical and Theoretical Chemistry
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In: CATALYSTS, Vol. 9, No. 8, 697, 08.2019.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Regarding the Nature of Charge Carriers Formed by UV or Visible Light Excitation of Carbon-Modified Titanium Dioxide
AU - Arimi, Arsou
AU - Günnemann, Carsten
AU - Curti, Mariano
AU - Bahnemann, Detlef W.
N1 - Funding information: This research was supported by Saint-Petersburg State University via a research Grant ID 32706707. The publication of this article was funded by the Open Access fund of Leibniz Universität Hannover. Acknowledgments: The authors are grateful to Dr. Gerald Dräger for performing the HPLC-MS measurements. A.A. acknowledges the financial support of the Deutscher Akademischer Austauschdienst (DAAD). C.G. acknowledges financial support from the Leibniz Universität Hannover within the program “Wege in die Forschung II”. M.C. is grateful to the DAAD together with the Ministerio de Educación, Cultura, Ciencia y Tecnología (Argentina) for his ALEARG scholarship.
PY - 2019/8
Y1 - 2019/8
N2 - Although titanium dioxide gathers many of the required properties for its application in photocatalytic processes, its lack of activity in the visible range is a major hurdle yet to be overcome. Among different strategies, the post-synthesis modification of TiO 2 powders with organic compounds has already led to commercially available materials, such as KRONOClean 7000. In this work, we apply diffuse reflectance transient absorption spectroscopy on this visible-light active photocatalyst and study the dynamics of the charge carriers alternatively induced by UV or visible light laser irradiation, under inert or reactive atmospheres. Our results can be interpreted by considering the material as TiO 2 sensitized by an organic-based layer, in agreement with previous studies on it, and show that the oxidative power of the material is considerably diminished under visible light irradiation. By complementarily performing continuous visible light irradiation photocatalysis experiments in aerated aqueous suspensions, we show that, although the oxidation of methanol proceeds at a very slow rate, the oxidation of chlorpromazine occurs much faster thanks to its better suited redox potential.
AB - Although titanium dioxide gathers many of the required properties for its application in photocatalytic processes, its lack of activity in the visible range is a major hurdle yet to be overcome. Among different strategies, the post-synthesis modification of TiO 2 powders with organic compounds has already led to commercially available materials, such as KRONOClean 7000. In this work, we apply diffuse reflectance transient absorption spectroscopy on this visible-light active photocatalyst and study the dynamics of the charge carriers alternatively induced by UV or visible light laser irradiation, under inert or reactive atmospheres. Our results can be interpreted by considering the material as TiO 2 sensitized by an organic-based layer, in agreement with previous studies on it, and show that the oxidative power of the material is considerably diminished under visible light irradiation. By complementarily performing continuous visible light irradiation photocatalysis experiments in aerated aqueous suspensions, we show that, although the oxidation of methanol proceeds at a very slow rate, the oxidation of chlorpromazine occurs much faster thanks to its better suited redox potential.
KW - Carbon-based modified TiO
KW - Carbon-doped materials
KW - Chlorpromazine
KW - KRONOClean 7000
KW - Transient absorption spectroscopy
KW - Visible light driven photocatalysis
UR - http://www.scopus.com/inward/record.url?scp=85076152425&partnerID=8YFLogxK
U2 - 10.3390/catal9080697
DO - 10.3390/catal9080697
M3 - Article
VL - 9
JO - CATALYSTS
JF - CATALYSTS
SN - 2073-4344
IS - 8
M1 - 697
ER -