Bio inspired green synthesis of Ni/Fe3O4 magnetic nanoparticles using Moringa oleifera leaves extract: A magnetically recoverable catalyst for organic dye degradation in aqueous solution

Abstract In this work, we have developed a facile, low-cost and ecofriendly method for synthesis of nickel supported iron oxide magnetic nanoparticles (Ni/Fe 3 O 4 MNPs) using Moringa oleifera (MO) leaves extract as reducing and capping agent. The as-synthesized Ni/Fe 3 O 4 nanocomposite was characterized by various physicochemical characterization techniques such as FTIR, powder XRD, XPS, TEM and BET sorption methods. The results show that the Ni/Fe 3 O 4 MNPs were exhibits spherical in shape with the size range of 16–20 nm. The room temperature magnetic measurements of composite clearly evince ferromagnetic natures with saturation magnetization (Ms) of 76.8 emu/g. The catalytic activity of Ni/Fe 3 O 4 MNPs towards degradation of Malachite green (MG) dye was determined by UV–vis spectroscopy. The results show that as-synthesized Ni/Fe 3 O 4 MNPs is an efficient catalyst for the degradation of Malachite green as compared to previous reports.