Synthesis of Cobalt Ferrite-Silica-Titania Nanocomposites

In this work, CoFe2O4/SiO2/TiO2 core-shell magnetic nanostructures have been prepared by coating of cobalt ferrite nanoparticles with the double SiO2/TiO2 layer. The Scanning Electron Microscopy (SEM) have been applied to investigate the structure and morphology of the resultant composites . Addition of an SiO2 intermediate layer between the magnetic core and the TiO2 shell weakens the adverse influence of magnetic on the photocatalysis of TiO2 .Despite the additional non-magnetic coatings result in a lower value of the magnetic moment, the particles can still easily be retrieved from reaction mixtures by magnetic separation. This retention of magnetism was of particular importance allowing magnetic recovery and re-use of the catalyst

Keywords:

magnetic nanoparticles , core-shell , silica , titanium dioxide , photocatalysis