Synthesis and characterization of polyvinyl pyrrolidone (PVP)-coated Fe3O4 nanoparticles by chemical co-precipitation method and removal of Congo red dye by adsorption process Gajanan Pandey*, Sandhya Singh, Gaurav Hitkari, 10.1007/s40089-018-0234-6 XML Requires Subscription HTML Requires Subscription PDF views: 177 downloads: 219