Abstract In this paper, we report a method for preparation of functionalized superparamagnetic Fe 3 O 4@ SiO 2 that is synthesized based on several stages. First of all, the Fe 3 O 4@ SiO 2 nanosphere core-shell is synthesized. Then, H 3 PMo 12 O 40 nanoparticles were synthesized by the treatment of H 3 PMo 12 O 40 with n-Octane as solvent by a solvothermal method and this nano hetero polyacid immobilized onto the ...