Sorption of Cs, Co, and Eu ions by poly-acrylonitrile-based Ce(IV) phosphate.

What is it about?

Kinetic, Equilibrium and Thermodynamic models were investigated for sorption of cesium, cobalt and europium ions from aqueous solution by poly-acrylonitrile based Ce(IV) phosphate. Effect of pH of the medium on the removal of aforementioned ions was studied. Pseudo-first-order, pseudo-second order rate expressions and intra-particle diffusion model were used for the kinetic studies and revealed that the mechanism of the sorption process is controlled by pseudo-second-order and particle diffusion might be involved in the sorption process. Langmuir and Freundlich isotherm models were applied for the sorption. And thermodynamic parameters were determined. The positive values of enthalpy change, ΔH, for the three metal ions confirming the endothermic nature of the sorption process and suggested that chemisorption was the predominant mechanism. The high positive values of the entropy change, ΔS, show the increased randomness at the solid/solution interface. The obtained negative values of free energy change, ΔG, indicating the feasibility and the spontaneous nature of the sorption. The results indicated that poly-acrylonitrile based Ce(IV) phosphate can be used as an efficient ion exchange material for the removal of cesium, cobalt and europium ions from industrial wastewater.

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