title: Platinum (IV) recovery from chloride solution by functionalized acrylic copolymers.
abstract: Two acrylic adsorbents with different morphological structures and bearing amidoethylenamine and thiol groups were obtained and used for platinum sorption from chloride solution by the batch method. Physico-chemical parameters that influence adsorption such as initial Pt(IV) concentration, stirring time, pH, and adsorbent amount were investigated. The thermodynamic parameters of Pt(IV) sorption on the synthesized adsorbent were also evaluated based on Langmuir and Freundlich isotherms. Thermodynamic parameters estimated from Langmuir constants indicated that the adsorption is spontaneous, exothermic and there is a disordered state at the molecular level. The models used to analyze the sorption rate led to the conclusion that the most important step in the sorption of Pt(IV) could be both particle diffusion and chemical reaction of [PtCl(6)](-) with amine functional groups. Thus, both the ion exchange and complex formation mechanisms can occur via nitrogen atoms in the recovery of Pt(IV) on the studied adsorbent.
authors.affiliation: Petru Poni Institute of Macromolecular Chemistry, 700487 Iasi, Romania. vneagu@icmpp.ro
authors.forename: Violeta
authors.initials: V
authors.lastname: Neagu
authors.forename: Carmen
authors.initials: C
authors.lastname: Paduraru
authors.forename: Ion
authors.initials: I
authors.lastname: Bunia
authors.forename: Lavinia
authors.initials: L
authors.lastname: Tofan
mesh_terms: D000179:Acrylates / Q000737:chemistry*; D000327:Adsorption; D002712:Chlorides / Q000737:chemistry*; D010984:Platinum / Q000302:isolation & purification*; D011108:Polymers / Q000737:chemistry*; D013816:Thermodynamics
chemical_list: D000179:Acrylates; D002712:Chlorides; D011108:Polymers; D010984:Platinum