Preparation of porous Fe₃O₄/C magnetic composite microspheres and its adsorption property for RhB

Surface modified Fe₃O₄ is prepared as magnetic core by coprecipitation. Porous Fe₃O₄/C magnetic composite microsphere is prepared via calcination of Fe₃O₄/PDVB microsphere which is prepared by suspension polymerization under nitrogen protection. The morphology, magnetic and pore properties of Fe₃O₄/C magnetic composite microspheres are characterized by SEM, TGA, VSM and mercury porosimeter. The results show that the average particle size of the microsphere is 120 μm. Magnetic content and specific saturation magnetization are 49.29% and 10.92 emu/g, respectively. Average pore diameter and specific surface area are 382.5 nm and 21.41 m²/g, respectively. Adsorption property of Fe₃O₄/C microspheres is studied using degradation of RhB as a model reaction. The microspheres exhibit excellent adsorption efficiencies and cycle property.