Controllable structure and adsorption for protein of magnetic particles

Magnetic composites Fe 3 O 4 @MIL-53/GO with different graphene oxide (GO) addition were prepared and characterized. It was found that GO had an effect on the structures of magnetic particles. Fe 3 O 4 @MIL-53/GO (5% GO) particles were spheres attached the surface of GO with the size about 200   nm, while Fe 3 O 4 @MIL-53/GO (10% GO) particles were spheres with the size about 500   nm. The adsorptions for protein onto different particles were compared. Fe 3 O 4 @MIL-53/GO (5% GO) was found to has more excellent adsorption capacity for protein than Fe 3 O 4 @MIL-53/GO (10% GO). It was concluded that the structure and adsorption for protein can be controlled through controlling the addition of GO.