Iron oxide magnetic nanoparticles (Fe3O4 NPs) are often synthesized using sodium borohydride with aggregation, which is a high cost process and environmentally toxic. To address these issues, Fe3O4 NPs were synthesized using green methods based on Cassia Occidentalis leaves (CO). The green synthesized CO-Fe3O4 MNPs was characterized using X-ray diffraction analysis (XRD), transmission electron microscopy (TEM) images, energy-dispersive X-ray spectroscopy (EDS), FT-IR spectroscopy and vibrational sample magnetometer (VSM). The magnetic properties of CO-Fe3O4 MNPs sample clearly exhibits ferromagnetic nature with a saturation magnetization of 15.3 emu/g. Further, the catalytic properties of CO-Fe3O4 MNPs for degradation of 4-Nitrophenol (4-NP) dye in aqueous solution have been investigated by UV–visible spectroscopy. The results show that CO-Fe3O4 MNPs is an efficient catalyst for degradation of 4-NP dye than previously reported ones
