A sorption study of Pd(II) on aminomethylphosphonic Purolite resin S-940

• Published in: Journal of the Serbian Chemical Society 2005, Vol.70 (10), p.1205-1212
• Main Authors: Paduraru, Carmen, Bilba, Doina, Sarghie, Ioan, Tofan, Lavinia
• Format: Article
• Language: English
• Subjects: aminomethylphosphonic resin; palladium(ii); sorption
• ISSN: 0352-5139; 1820-7421
• DOI: 10.2298/JSC0510205P

Many methods for the preconcentration-recovery of platinic metals are based on complexing sorbents. As platinic metals have a high tendency to form com plexes, the complex-forming sorbents are particularly useful. This study concerns the sorption of Pd(II) on aminomethylphosphonic Purolite S-940 resin. In order to establish the optimum conditions of Pd(II) sorption on S-940 resin, the influence of the following experimental conditions: solution pH, Pd(II) initial concentration and temperature were studied. The yield of Pd(II) recovery was maximum in buffer solutions of pH 3?5 and decreases with increasing initial concentration of the solution. The equilibrium distribution of Pd(II) between the two phases (sorbent and solution) is described by the Langmuir model of monomolecular layer adsorption. The thermodynamic quantities characteristic for the Pd(II) sorption process suggest an affinity of the Purolite resin S-940 for Pd(II). Kako platinski metali imaju veliku sklonost ka pravljenju kompleksa, za njihovu sorpciju posebno su korisni sorbensi sposobni da stvaraju komplekse. U ovom radu se proucava sorpcija Pd(II) na S-940 aminometilfosfonskoj smoli. Za odredjivanje optimalnih uslova sorpcije Pd(II) na S-940 proucavani su sledeci eksperimentalni faktori: pH rastvora, pocetna koncentracija Pd(II) i temperatura. Stepen desorpcije Pd(II) imao je maksimum u puferinom rastvoru sa pH 3 ? 5, pri cemu se ovaj smanjuje sa povecanjem pocetne koncentracije Pd(II). Ravnotezna raspodela Pd(II) izmedju dve faze (rastvora i sorbensa) opisana je Langmirovim modelom monomolekulskog adsorpcionog sloja.