Preparation and characterization of CNSR functionalized Fe3O4 magnetic nanoparticles: An efficient adsorbent for the removal of cadmium ion from water

Cashew Nut Shell Resin (CNSR) coated magnetic nanoparticles are capable of removing heavy metals from waste water was synthesized by sol-gel process. The epoxidized CNSR was covalently bonded to Fe3O4 nanoparticle surface through Michael addition reaction between epoxy ring in CNSR and the amine group present at nanoparticle surface. The adsorbent was characterized by XRD, TEM, FT-IR, BET and MALDI-Mass measurements. The TEM images confirm that the magnetite nanostructures have spherical morphology with uniform size distribution. The average size of magnetic nanoparticles is 40 nm. An FT-IR and MALDI-Mass spectrum clears the physical and chemical changes occurred during the Michael addition reaction between epoxidized CNSR and aminated Fe3O4 nanoparticle. The toxicity reduction or removal of Cadmium ion from waste water or drinking water source by the prepared CNSR-Fe3O4 nanoparticles shows an efficient adsorbent for metal ion removal. The heavy metal ion removal studies at various pH proved that the adsorbent can be used as an capable low cost ECO friendly material for removing even trace toxic Cadmium from contaminated water, particularly at basic pH.