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Enhanced photocatalytic properties of lanthanide-TiO2 nanotubes: An experimental and theoretical study
Abstract
A series of Er-, Yb-, Ho-, Tb-, Gd-, Pr-TiO2 nanotubes (RE-NTs) was prepared via an electrochemical method. The as-prepared photocatalysts were characterized by X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), UV–vis absorption, scanning electron microscopy (SEM) and luminescent spectroscopy. The experiments demonstrated that toluene in the gas phase was successfully degraded under visible light (LEDs λmax = 465 nm) using RE-NTs. In the presence of the most active sample (Ho-NTs), the photodegradation of toluene reached 30% after 60 min of vis irradiation. To investigate the localization of RE in the TiO2 structure, computer simulations were performed using the plane-wave-based Vienna ab-initio simulation package (VASP) implementing spin-polarized density-functional theory (DFT) and the generalized gradient approximation (GGA). It is proposed that during the electrochemical process, TiO2 systems with new Ho-f states below the conduction band of TiO2 is formed. The photocatalytic activity under Vis irradiation is attributable not to radical dotOH but to other forms of reactive oxygen species (O2radical dot−, HO2radical dot, H2O2).
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Authors (12)
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Wojciech Lisowski
- Institute of Physical Chemistry, Polish Academy of Sciences -
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Tomasz Grzyb
- Adam Mickiewicz University Department of Rare Earths
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Alicja Mikołajczyk
- University of Gdansk Laboratory of Environmental Chemometrics
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Adam Hirsch
- University of Gdansk Department of Environmental Technology
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Agnieszka Kołakowska
- University of Gdansk Department of Environmental Technology
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Tomasz Puzyn
- University of Gdansk Laboratory of Environmental Chemometrics
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Joanna Nadolna
- University of Gdansk Department of Environmental Technology
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
APPLIED CATALYSIS B-ENVIRONMENTAL
no. 205,
pages 376 - 385,
ISSN: 0926-3373 - Language:
- English
- Publication year:
- 2017
- Bibliographic description:
- Mazierski P., Lisowski W., Grzyb T., Winiarski M., Klimczuk T., Mikołajczyk A., Flisikowski J., Hirsch A., Kołakowska A., Puzyn T., Zaleska-Medynska A., Nadolna J.: Enhanced photocatalytic properties of lanthanide-TiO2 nanotubes: An experimental and theoretical study// APPLIED CATALYSIS B-ENVIRONMENTAL. -Vol. 205, (2017), s.376-385
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.apcatb.2016.12.044
- Verified by:
- Gdańsk University of Technology
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