Photocatalytic activity of TiO2-capped ZnO nanoparticles |
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| Authors: | Aidin Lak Abdolreza Simchi Ziarat Ali Nemati |
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| Affiliation: | (1) Department of Materials Science and Engineering, Sharif University of Technology, Azadi Avenue, P. O. Box 11365-9466, Tehran, Iran;(2) Institute for Nanoscience and Nanotechnology, Sharif University of Technology, Azadi Avenue, P. O. Box 11365-9466, Tehran, Iran |
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| Abstract: | 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. |
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