Synthesis and Characterization of Co-Ce Codoped TiO<sub>2</sub>/SiO<sub>2</sub>/NiFe<sub>2</sub>O<sub>4</sub> Magnetic Mesoporous Microspheres

Abstract

Polystyrene/SiO2/NiFe2O4 magnetic microspheres were prepared by emulsion polymerization using NiFe2O4 nanoparticles as magnetic carriers, styrene and tetraethoxysilane as raw materials, and 3-Methacryloxypropyltrimethoxysilane as a cross-linking agent. Co-Ce codoped TiO2/SiO2/NiFe2O4 magnetic mesoporous microspheres material were prepared by sol-gel process with tetrabutyl titanate as raw materials，Co and Ce as doping ions, PS-SiO2/NiFe2O4 particles as the cores, sodium dodecyl sulfate and polyvinylpyrrolidone as templates. The crystal structure and surface morphology of Co-Ce Codoped TiO2/SiO2/NiFe2O4 magnetic mesoporous microspheres were characterized by vibrating sample magnetometer(VSM)，X-ray diffraction(XRD)，scanning electron microcopy(SEM)，UV-Vis diffuse reflectance spectroscopy( DRS) and temperature programmed desorption of oxygen(TPD). The results indicated that Co-Ce codoped TiO2/SiO2/NiFe2O4 particles were mesoporous microspheres with core-shell structure. The red shift of the absorption spectrum of Co-Ce codoped TiO2/SiO2/NiFe2O4 was observed by Co-Ce codoping, which enlarge the photoresponse range and surface oxygen storage of TiO2.