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Photocatalytic activity of TiO2-capped ZnO nanoparticles [electronic resource]

Lak, A. (Aidin) ; 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, TiO2-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 Zn2TiO4 phase at higher calcination temperature was noticed. Effects of Ti/Zn molar ratio and coating time on the thickness of TiO2 shell and the photoactivity of the particles for decolorization of Methylene Blue (MB) under UV lamp irradiation (3 mW/cm2) 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 TiO2 nanoparticles
  5. Keywords:
  7. Source: Journal of Materials Science: Materials in Electronics ; 2011 , Vol. 23, Issue 2, P.361-369
  8. URL: http://link.springer.com/article/10.1007/s10854-011-0396-8#page-1