Due to thermal and chemical stability hematite nanoparticles considered highly suitable for biomedical applications. We recognized a biological method for the synthesis of iron oxide nanoparticles using the leaves extract of the Neolamarckia Cadamba. When we mix the extract and metal precursor solution then leaves extract reduce the feeric ion initially and forms FeOOH. After some time precipitates of Fe2O3 were obtained which were identified by the UV-Visible and FT-IR spectroscopy. During the reaction ferric ion reduced by Neolamarckia cadamba leaves extract. The Leaves extract also act as a stabilizing agent. The polyol compound like flavonoid and other compounds such as amine, alkenes are responsible for the reduction of metal ions. The photocatalytic efficiency of Fe2O3 nanoparticles was evaluated by the degradation of malachite green under sunlight irradiation

Keywords : Iron Nanoparticles, Neolamarckia Cadamba, UV-Visible Spectroscopy, FT-IR, Photocatalyst, Reducing Agent, Green Catalyst