In this study, the iron oxide nanoparticles were synthesised by green synthesis technique using lotus seed extract. The phytoconstituents present in the seed extract play a significant role in the fabrication of nanoparticles and act as a stabilizing, reducing and capping agent. The prepared iron oxide nanoparticles were analysed using various techniques such as X–ray diffraction (XRD), scanning electron microscope (SEM), Fourier-transformed infrared spectroscopy (FT-IR), Energy dispersive X– ray, and UV–Visible spectroscopy techniques. XRD result reveals that the average crystallite size was 45.1 nm and the crystallite shape was face – centred cubic in structure. The band gap energy of α-Fe2O3 nanoparticles was calculated to be 2.74 eV from UV–Visible analysis. The dye was determined using iron oxide nanoparticles. The photocatalytic degradation efficiency of methyl orange was achieved about 93.5 % in the conditions of 50 ml of 100 mg/L dye concentration, pH = 7.0, 10 mg/ml α-Fe2O3 and reaction time 120 minutes. The results of this study highlights that the nanomaterials prepared through green route have great importance in dye degradation applications.
