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ISBN: 978-162276306-1
Conference information: Proceedings of the 29th IPMI Annual Precious Metals Conference 2005

Abstract: A new ion- imprinted polymer was synthesized by bulk polymerization by using platinum-iodide -vinyl pyridinium ion ternary ion association complex as a template with 2- hydroxy ethyl methacrylate (functional monomer) and ethylene glycol dimethacrylate (crooslinking monomer) in the presence of 2,2'-azobis isobutrylonitrile as initiator. The synthesis was carried out thermally at 60 °C in methanol medium and the resultant polymer material was dried and filtered to get unleached polymer particles. The imprinting anionic species i.e, [PtI6]2- was removed by stirring the above particles for 18 hr with 6M HCI to obtain leached polymer particles. These leached polymer particles will now selectively rebind [PtI6]2- species. Non imprinted / control polymer particles were similarly prepared with out the template. Control, unleached and leached polymer particles were characterized by XRD,UV- Visible spectrophotometric and SEM studies. Various parameters that influence the recovery of platinum from dilute aqueous solutions were systematically studied and the results obtained are described in this paper. In all these studies the imprinting effect was noticed. Furthermore, the percent recoveriesobtained with leached and control polymer particles for platinum and other noble metals and base metals which are likely to coexist with platinum in its minerals were also studied. These studies indicate the possibility of selective recovery of platinum from its minerals
Template and target information: platinum, PtI₆^2-