Tris(tetraalkyl ammonium tribromide) immobilized on Fe3O4 magnetic nanoparticles (Br3-Fe3O4) is a stable, green, and magnetically recoverable source of bromine and used as an efcient nanocatalyst for the clean and rapid oxidation of sulfdes to sulfoxides using hydrogen peroxide (H2O2), with short reaction times in good to high yields under solvent-free conditions. After completing reactions, the catalyst was easily separated using an external magnetic feld from the reaction mixture and reused for several consecutive runs without signifcant loss of its catalytic efciency. The nanomagnetically catalyst was characterized by FT-IR spectroscopy, TGA, VSM, XRD, TEM and SEM
