The Fate of Gd(III) Sorption by Novel Microporous Chelating Resin

Sorption of Gadolinium (III) by a novel microporous chelating resin Hp-8 from aqueous solutions is investigated in this studyat different operating conditions.Characterization of Hp-8 was investigated.Solution pH hada dramatic influence on the uptake in batch process.It was found that pH 2.5 was the best one at the present experimental set.The equilibrium sorption data were fitted to different isotherm models and it is found that both Freundlich and D-R models were able to accurately represent the findings.Based on the D-R isotherm data, the employed resin exhibited maximum adsorption capacity of about 51 mg/g.The three thermodynamic parameters for the present process of adsorption were estimated with values of enthalpy ∆H o = -4.473,an entropy ∆S o = -44.127and Gibbs free energy ∆G o = -8.597,-9.359, -10.063 at 298, 318, 328 0 K respectively.Regeneration studies showed that the present resin is effectively applied for sorption of Gd(III) upto 5 cycles.