Investigation of platinum (IV) adsorption by polyamine polymer

In this study, adsorption of Pt (IV) ions from containing chloride solutions by 1,3,5-triazine pentaethylenhexamine (TAPEHA) polymer was investigated. The effective factors on the batch adsorption of Pt (IV) such as of acidity of aqueous phase, contact time, initial concentration and temperature were investigated and optimized. Concentration of Pt (IV) remaining in the solution after adsorption was measured using flame atomic absorption spectrometer and the adsorbed amount of Pt per gram of the polymer was calculated from difference of initial concentration and the final equilibrium concentration. Adsorption of Pt (IV) was found to be maximal at 0.1M hydronium concentration and Pt (IV) adsorption was decreased by increasing of hydronium concentration. It was found to be increasing of temperature was caused to decrase in adsorption of Pt (IV). The contact time was found to be effective for adsorption of Pt, increasing of the time increases the adsorption of Pt (IV) until equilibrium condition occurs and the time to reach equilibrium was found to be 24 hours. Increasing of the initial concentration of Pt (IV) ions enhanced the adsorption until it reaches a saturation capacity of TAPEHA polymer. Pt (IV) adsorption kinetics was examined using kinetic models such as intra-particle diffusion model, pseudo first and second order equation and adsorption of Pt (IV) was found to be compatible with pseudo second order kinetic model. The equilibrium of Pt (IV) was investigated by using Langmuir and Freundlich equations. Adsorption of Pt (IV) was found to be compatible with Langmuir equation providing an adsorption capacity of TAPEHA 909.1 mg/g for Pt (IV).