Superparamagnetic high-magnetization composite microspheres with Fe3O4@SiO2 core and highly crystallized mesoporous TiO2 shell

► Sandwich structured Fe3O4@SiO2@m-TiO2 microspheres have been prepared. ► Pluronic P123 was used as template to prepare the mesoporous microspheres. ► The superparamagnetic microspheres are uniform in both size and shape. ► The mesoporous shell is highly crystallized anatase titania. ► The microspheres possess large surface area, pore size, and high magnetization.