OICC Press International Nano Letters 2228-5326 8 2 (June 2018) 2018 05 25 Synthesis and characterization of polyvinyl pyrrolidone (PVP)-coated Fe3O4 nanoparticles by chemical co-precipitation method and removal of Congo red dye by adsorption process 10.1007/s40089-018-0234-6 EN Gajanan Pandey Department of Applied Chemistry, Babasaheb Bhimrao Ambedkar Univesity (A Central University), Lucknow, UP, 226025, IN Sandhya Singh Department of Applied Chemistry, Babasaheb Bhimrao Ambedkar Univesity (A Central University), Lucknow, UP, 226025, IN Gaurav Hitkari Department of Applied Chemistry, Babasaheb Bhimrao Ambedkar Univesity (A Central University), Lucknow, UP, 226025, IN Journal Article 2018 05 25 Abstract The present paper deals synthesis of polyvinyl pyrrolidone (PVP)-coated magnetite nanoparticles by chemical co-precipitation method. The samples were characterized using X-ray diffraction, scanning electron microscopy, energy-dispersive X-ray spectroscopy (EDX), Fourier transform infrared spectroscopy (FT-IR) and Brunauer–Emmett–Teller (BET) methods. The surface area, pore volume and pore radius were calculated by the BET analysis. The EDX and FT-IR analysis demonstrated the fabrication of PVP-coated Fe 3 O 4 NPs. The as-synthesized Fe 3 O 4 /PVP has successfully been used as an adsorbent for elimination of Congo red dye in aqueous medium.