Removal of Methyl Orange from Aqueous Solutions by Ferromagnetic Fe/Ni Nanoparticles

Herein, the removal of methyl orange (mo), a monoazo dye, from aqueous solutions was investigated using bimetallic ferromagnetic fe/ni nanoparticles (nps) with the average particle size of 12-16 nm. the effect of contact time, ph, temperature, and fe/ni dosage on dye removal process was investigated. the results showed that 60 mg of fe/ni nps at 25 °c and ph = 1 can remove 99.5% of 50 mg l^-1 dye solution within 15 min. the mo removal follows the pseudo-second-order kinetics with the rate constant of 0.4114 g mg^-1 min^-1. the chromophore structure of the dye was broken down in the presence of fe/ni nps. the fe/ni nps were prepared by simple co-reduction method and characterized by several techniques including x-ray diffraction, scanning electron microscopy, transmission electron microscopy (tem), high-resolution tem, scanning tunneling microscopy, and vibrating sample magnetometer.