OICC Press Journal of Nanostructure in Chemistry 2193-8865 8 3 (September 2018) 2018 08 31 Azadirachta indica influenced biosynthesis of super-paramagnetic iron-oxide nanoparticles and their applications in tannery water treatment and X-ray imaging 10.1007/s40097-018-0279-0 EN Antony V. Samrot Department of Biotechnology, School of Bio and Chemical Engineering, Sathyabama Institute of Science and Technology, Chennai, Tamil Nadu, 600119, IN P. Senthilkumar Department of Chemical Engineering, School of Bio and Chemical Engineering, Sathyabama Institute of Science and Technology, Chennai, Tamil Nadu, 600119, IN S. Rashmitha Department of Chemical Engineering, School of Bio and Chemical Engineering, Sathyabama Institute of Science and Technology, Chennai, Tamil Nadu, 600119, IN Priscilla Veera Department of Chemical Engineering, School of Bio and Chemical Engineering, Sathyabama Institute of Science and Technology, Chennai, Tamil Nadu, 600119, IN Chamarthy Sai Sahithya Department of Biotechnology, School of Bio and Chemical Engineering, Sathyabama Institute of Science and Technology, Chennai, Tamil Nadu, 600119, IN Journal Article 2018 08 31 Abstract Super-paramagnetic iron-oxide nanoparticles (SPIONs) have been exploited from a very long time and are researched profoundly due to their unique properties. In this study, SPIONs were synthesized using environmentally accepted green synthesis process where Azadirachta indica leaf extract was used as one of the reducing agents along with basic metal precursors used in chemical processes. The synthesized SPIONs were characterised using microscopic analysis (SEM, TEM, and AFM), spectroscopic analysis (FT-IR, UV–Vis, XRD, Raman, and zeta potential), and magnetometry (SQUID). The SPIONs were then tested for its application in the removal of heavy metals from tannery waste water and also X-ray imaging.