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Fe₃O₄ and Fe₃O₄/TiO₂ magnetic nanoparticles have been successfully prepared using an eco-friendly green synthesis method with various Moringa Oleifera (MO) extract concentrations. The X-ray diffraction and transmission electron microscopy results confirmed that the microstructure of Fe₃O₄ nanoparticles is a cubic inverse spinel structure with an average particle size of 9.2–11.7 nm and lattice parameters is in the range of 8.14–13.60 Å and the MO did not change the morphological structure of Fe₃O₄. Fourier-transform infrared showed that the samples had magnetic particles vibration peaks at 632 cm^-1 and 570 cm^-1, 500–700 cm^-1 for Ti-O peaks, and 1047 cm^-1 for aromatic C-C indicating green synthesis. Furthermore, the results of UV-VIS data presented the absorption edges of Fe₃O₄, Fe₃O₄-MO, and Fe₃O₄/TiO₂-MO were 187.9 nm, 198.7 nm, and 197.1 nm, respectively. The bandgap energy of Fe₃O …