Synthesis and magnetic properties of magnetic-improved SBA 15 mesoporous composites by nanoparticles

The nano-Co₃O₄ and nano-CoFe₂O₄ modified SBA-15 magnetic mesoporous, Co₃O₄ /SBA-15 and CoFe₂O₄/SBA-15 composites were prepared by immersion method. The microstructure and magnetic properties of the composites were analyzed by X-ray diffraction (XRD), transmission electron microscopy (TEM), field emission scanning electron microscopy (FESEM) and vibrating sample magnetometer (VSM). All results indicate that Co₃O₄ and CoFe₂O₄ nanoparticles exist in the mesopores of SBA-15, which can improve the magnetic properties of the SBA-15 nanocomposites. The study reveals that the magnetic properties of SBA-15 nanocomposites are attributed to the doped magnetic nanoparticles. And the magnetic properties are improved with the content of Co₃O₄ and CoFe₂O₄ nanoparticles, in which the coercivity reaches the maximum of 400 Oe and the saturation magnetization is 9emu/g.