Preparation and characterization of Fe3O4@Chitosan@Ag-SO3H nanoparticles

Unsupported nanoparticles are often less stable, and usually coagulation is unavoidable during the catalytic reactions. To generate stable nanoparticles with good activity, stabilizing the surface is required. Protection has been performed by the addition of polymers or long-chain alkyl surfactants with polar functional groups that attached to the nanoparticle surface via covalent or electrostatic interactions. Alternatively, nanoparticles have been immobilized or grafted onto inorganic supports to improve their stabilization and recycling ability [1]. In this research,Chitosan (CS) coated iron oxide decorated silver nanoparticles immobilized chlorosulfonic (nano-Fe3O4@CS@Ag-SO3H) was prepared. Nano-Fe3O4@CS@Ag-SO3H was characterized [2] via FT-IR, powder X-ray diffraction (XRD), scanning electron microscopy (SEM), vibrating sample magnetometer (VSM), thermogravimetric analysis (TGA). Th e nanoparticles could be recycled several times without significant loss of its activity. Clean methodologies, easy work-up procedures by using an external magnet, high yield and simple preparation of the nanoparticles are some advantages of this procedure.