Manganese ferrite NPs were prepared in one step at room temperature following an electrochemical route, as shown in Fig. 1. The process involved the gradual release of Fe2 + and Fe3 + ions through the solution via application of a current density to the iron anode (8 cm2). A cylindrical counter-electrode of iron with an area of 120 cm2 was used as the cathode and placed around the anode. A current density of 50 mA/cm2 was applied and the purity of the Fe was 99.9% (Goodfellow). The Mn2 + ions were directly obtained using manganese chloride salt in solution (0.06 M of MnCl2·4H2O). A 0.04 M solution of R4NBr (R = Butyl) was employed as a surfactant, preventing agglomeration of nanoparticles during their synthesis. The solution was magnetically stirred throughout the electrosynthesis and a synthesis time of 1800s was employed. Subsequently, the nanoparticles obtained were magnetically separated from the solution, washed with distilled water and dried under vacuum at 60 °C for 24 h.