The preparation, characterization and photocatalytic activity of radical-shaped CeO2/ZnO microstructures

This paper uses a wet-chemical precipitation route to prepare radical-shaped ZnO microprisms and to deposit Cerium oxide (CeO2) on the surface of ZnO, to form CeO2/ZnO microstructures. The samples are characterized using X-ray powder diffraction (XRD), scanning electron microscopy (SEM) and UV-vis diffuse reflectance spectroscopy. Their catalytic activity is also evaluated using methylene blue (MB) as a detection reagent. CeO2/ZnO systems exhibit higher UV absorption and transparency in the visible region. The experimental results show that the deposition of CeO2 nanospecies is successful and that the radical-shaped microstructures of ZnO are well maintained. The CeO2/ZnO microstructures exhibit a much greater intensity of UV-light absorptivity and much higher photocatalytic activity than those of radical-shaped ZnO microprisms. (C) 2013 Elsevier Ltd and Techna Group S.r.l. All rights reserved.