Zusammenfassung
We report the study of the growth of CeO2 nanoparticles on the external
walls and Ce4+ intercalation within the titanate nanotubes. The
materials were fully characterized by multiple techniques, such as:
Raman spectroscopy, infrared spectroscopy (FTIR), energy dispersive
spectroscopy (EDS), X-ray diffraction (XRD), X-ray photoelectron
spectroscopy (XPS) and transmission electron microscopy (TEM). The ion
exchange processes in the titanate nanotubes were carried out using
different concentrations of Ce4+ in aqueous solution. Our results
indicate that the growth of CeO2 nanoparticles grown mediated by the
hydrolysis in the colloidal species of Ce and the attachment onto the
titanate nanotubes happened and get it strongly anchored to the titanate
nanotube surface by a simple electrostatic interaction between the
nanoparticles and titanate nanotubes, which can explain the small size
and even distribution of nanoparticies on titanate supports. It was
demonstrated that it is possible to control the amount and size of CeO2
nanoparticles onto the nanotube surface, the species of the Ce ions
intercalated between the layers of titanate nanotubes, and the materials
could be tuned for using in specific catalysis in according with the
amount of CeO2 nanoparticles, their oxygen vacancies/defects and the
types of Ce species (Ce4+ or Ce3+) present into the nanotubes. (C) 2015
Elsevier Ltd. All rights reserved.
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