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Visible light photoactivity of TiO2loaded with monometallic(Au or Pt) and bimetallic (Au/Pt) nanoparticles
Abstract
TiO2modified with monometallic (Au or Pt) and bimetallic (Au/Pt) nanoparticles have been preparedusing a water-in-oil microemulsion system (water/AOT/cyclohexane) followed by calcination step. Theeffect of metal ratio, reducing agent type (NaBH4or N2H4), TiO2matrix type (P-25, ST-01, TiO-5, TiO2nano-tubes or TiO2obtained by TIP hydrolysis) as well as calcination temperature (from 350 to 650◦C) weresystematically investigated. Obtained photocatalysts were characterized by UV–vis diffuse-reflectancespectroscopy (DRS), BET surface area measurements, scanning transmission microscopy (STEM), X-raydiffraction analysis (XRD), and X-ray photoelectron spectroscopy (XPS). Photocatalytic activity undervisible light ( > 420 nm) has been estimated in phenol degradation reaction in aqueous phase. Theresults showed that phenol degradation rate under visible light in the presence of TiO2loaded with Au/Ptnanoparticles differed from 0.7 to 2.2 mol dm−3min−1for samples prepared using different reducingagent. Sodium borohydride (NaBH4) favors formation of smaller Au/Pt nanoparticles and higher amountgold in Au/Pt is in the form of electronegative species (Auı−) resulted in higher photoactivity. TiO2obtained by TIP hydrolysis in microemulsion system seems to be the best support for Au/Pt nanoparticlesfrom all among investigated matrix. It was also observed that enhancement of calcination temperaturefrom 450 to 650◦C resulted in rapid drop of Au/Pt-TiO2photoactivity under visible light due to surfacearea shrinkage, crystal structure change and probably change in Au/Pt nanoparticles morphology.
Authors (6)
-
Wojciech Lisowski
- Centrum Nanobiomedyczne centrum nanobiomedyczne
-
Marcin Jarek
- Centrum Nanobiomedyczne .
-
Grzegorz Nowaczyk
- Centrum Nanobiomedyczne .
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- Category:
- Articles
- Type:
- artykuł w czasopiśmie wyróżnionym w JCR
- Published in:
-
APPLIED SURFACE SCIENCE
no. 317,
pages 1131 - 1142,
ISSN: 0169-4332 - Language:
- English
- Publication year:
- 2014
- Bibliographic description:
- Gołąbiewska A., Lisowski W., Jarek M., Nowaczyk G., Zielińska-Jurek A., Zaleska-Medynska A.: Visible light photoactivity of TiO2loaded with monometallic(Au or Pt) and bimetallic (Au/Pt) nanoparticles// APPLIED SURFACE SCIENCE. -Vol. 317, (2014), s.1131-1142
- Verified by:
- Gdańsk University of Technology
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