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The effect of metal cluster deposition route on structure and photocatalytic activity of mono- and bimetallic nanoparticles supported on TiO2 by radiolytic method
Abstract
TiO2 (P25) was modified with small and relatively monodisperse mono- and bimetallic clusters (Ag, Pd, Pt, Ag/Pd, Ag/Pt and Pd/Pt) induced by radiolysis to improve its photocatalytic activity. The as-prepared samples were characterized by X-ray fluorescence spectrometry (XRF), photoluminescence spectrometry (PL), diffuse reflectance spectroscopy (DRS), X-ray powder diffractometry (XRD), scanning transition electron microscopy (STEM) and BET surface area analysis. The effect of metal type (mono- and bimetallic modification) as well as deposition method (simultaneous or subsequent deposition of two metals) on the photocatalytic activity in toluene removal in gas phase under UV–vis irradiation (light-emitting diodes- LEDs) and phenol degradation in liquid phase under visible light irradiation (λ > 420 nm) were investigated. The highest photoactivity under Vis light was observed for TiO2 co-loaded with platinum (0.1%) and palladium (0.1%) clusters. Simultaneous addition of metal precursors results in formation of larger metal nanoparticles (15-30 nm) on TiO2 surface and enhances the Vis-induced activity of Ag/Pd-TiO2 up to four times, while the subsequent metal ions addition results in formation of metal particle size ranging from 4 to 20 nm. Subsequent addition of metal precursors results in formation of BNPs (bimetallic nanoparticle) composites showing higher stability in four cycles of toluene degradation under UV-Vis. Obtained results indicated that direct electron transfer from the BNPs to the conduction band of the semiconductor is responsible for visible light photoactivity, whereas superoxide radicals (such as O2•− and radical dotOOH) are responsible for pollutants degradation over metal-TiO2 composites.
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Authors (7)
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Joanna Nadolna
- University of Gdansk Department of Environmental Technology
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Paweł Mazerski
- University of Gdansk Department of Environmental Technology
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Hynd Remita
- Laboratoire de Chemie Physique .
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Marek Klein
- IMP PAN .
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Details
- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
APPLIED SURFACE SCIENCE
no. 378,
pages 37 - 48,
ISSN: 0169-4332 - Language:
- English
- Publication year:
- 2016
- Bibliographic description:
- Nadolna J., Gołębiewska A., Mazerski P., Klimczuk T., Remita H., Zaleska-Medynska A., Klein M.: The effect of metal cluster deposition route on structure and photocatalytic activity of mono- and bimetallic nanoparticles supported on TiO2 by radiolytic method// APPLIED SURFACE SCIENCE. -Vol. 378, (2016), s.37-48
- DOI:
- Digital Object Identifier (open in new tab) 10.1016/j.apsusc.2016.03.191
- Verified by:
- Gdańsk University of Technology
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