Abstract
The removal efficiency of Pb(II) from aqueous solutions by sorption on a bifunctional acrylic ion exchange resin with groups of hydroxamic acid and amidoxime is presented. It was found that Pb(II) sorption potential varies as function of solution pH, initial metal concentration, contact time and temperature. From aqueous solutions with Pb(II) initial concentration of 82.96 g/mL the sorption percentage is 98.64%. The Langmuir and Freundlich isotherms were used to model the Pb(II) sorption equilibrium. The Langmuir model has a better correlation with experimental data than the Freundlich model. The values of the Langmuir maximum capacity of Pb(II) sorption showed an increasing trend with temperature being of 0.9378, 1.0085 and 1.162 mmole/g at 4 C, 25 C and 50 C, respectively. The thermodynamic quantities characteristic for Pb(II) sorption process suggest an affinity of the bifunctional ion exchanger on basis of ethylacrylate: acrylonitrile: divinylbenzene copolymers for Pb(II) ions. The kinetics of Pb(II) retention follows the Lagergren pseudo first order model. The obtained results are significant for the future development of the tested sorbent into beneficial material for environmental applications.
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