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Photocatalytic activity of TiO 2-capped ZnO nanoparticles

Lak, A ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1007/s10854-011-0396-8
  3. Abstract:
  4. Using a combined hydrothermal and sol-gel route, TiO 2 -capped ZnO nanoparticles with an average size of 60 nm were prepared. The titania shell was amorphous with a thickness of ∼10 nm. Formation of Zn 2TiO 4 phase at higher calcination temperature was noticed. Effects of Ti/Zn molar ratio and coating time on the thickness of TiO 2 shell and the photoactivity of the particles for decolorization of Methylene Blue (MB) under UV lamp irradiation (3 mW/cm 2) were investigated. The nanoparticles were characterized by X-ray diffraction, transmission electron microscopy, fourier-transform infrared spectrometry (FTIR), diffuse reflectance spectroscopy (DLS), and atomic absorption spectroscopy. Analysis of the photoactivity results according to Langmuir-Hinshelwood model revealed a two-step decolorization process with a high kinetics rate at the early stage followed by a slower step. The capped nanoparticles synthesized under specific conditions exhibited higher photodecolorization yield and faster kinetics in comparison to the uncoated ZnO and P25-Degussa TiO 2 nanoparticles
  5. Keywords:
  6. Atomic absorption spectroscopy ; Average size ; Calcination temperature ; Coating time ; Degussa ; Diffuse reflectance spectroscopy ; FTIR ; Infrared spectrometry ; Langmuir-Hinshelwood models ; Methylene blue ; Molar ratio ; Photoactivity ; Photocatalytic activities ; Photodecolorization ; Sol-gel routes ; TiO ; Titania shell ; UV lamp irradiation ; ZnO ; ZnO nanoparticles ; Calcination ; Infrared spectroscopy ; Nanoparticles ; Photocatalysis ; Sol-gel process ; Transmission electron microscopy ; X ray diffraction ; Zinc oxide ; Titanium dioxide
  7. Source: Journal of Materials Science: Materials in Electronics ; Volume 23, Issue 2 , 2012 , Pages 361-369 ; 09574522 (ISSN)
  8. URL: http://link.springer.com/article/10.1007%2Fs10854-011-0396-8