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In situ assembly of well-dispersed Au nanoparticles on TiO2/ZnO nanofibers: a three-way synergistic heterostructure with enhanced photocatalytic activity.
- Source :
-
Journal of hazardous materials [J Hazard Mater] 2012 Oct 30; Vol. 237-238, pp. 331-8. Date of Electronic Publication: 2012 Aug 31. - Publication Year :
- 2012
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Abstract
- The TiO(2)/ZnO nanofibers embedded by Au nanoparticles (TiO(2)/ZnO/Au NFs) were fabricated by combining the electrospinning technique (for TiO(2)/ZnO nanofibers) and an in situ reduction approach (for Au nanoparticles). X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy, transmission electronmicroscopy, X-ray photoelectron spectroscopy, UV-vis diffuse reflectance spectroscopy and photoluminescence spectroscopy, were used to characterize the as-synthesized nanofibers. The results showed that small Au nanoparticles (Au NPs) were well dispersed on the TiO(2)/ZnO nanofibers (TiO(2)/ZnO NFs). And, the TiO(2)/ZnO/Au nanofibers showed high charge separation efficiency under ultraviolet excitation, as evidenced by photoluminescence spectra. The photocatalytic studies revealed that the TiO(2)/ZnO/Au NFs exhibited enhanced photocatalytic efficiency of photodegradation of Methyl orange (MO) and 4-nitrophenol (4-NP) compared with the pure TiO(2) nanofibers, ZnO nanofibers and TiO(2)/ZnO NFs under ultraviolet excitation, which might be attributed to the high separation efficiency of photogenerated electron-hole pairs based on the photosynergistic effect among the three components of TiO(2), ZnO and Au. And, the TiO(2)/ZnO/Au NFs could be easily separated and recycled due to their one-dimensional nanostructural property.<br /> (Copyright © 2012 Elsevier B.V. All rights reserved.)
- Subjects :
- Azo Compounds chemistry
Azo Compounds radiation effects
Catalysis
Coloring Agents chemistry
Coloring Agents radiation effects
Nitrophenols chemistry
Nitrophenols radiation effects
Photolysis
Ultraviolet Rays
Waste Disposal, Fluid methods
Gold chemistry
Metal Nanoparticles chemistry
Nanofibers chemistry
Titanium chemistry
Zinc Oxide chemistry
Subjects
Details
- Language :
- English
- ISSN :
- 1873-3336
- Volume :
- 237-238
- Database :
- MEDLINE
- Journal :
- Journal of hazardous materials
- Publication Type :
- Academic Journal
- Accession number :
- 22975259
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2012.08.054