Surface Engineering of PAMAM-SDB Chelating Resin with Diglycolamic Acid (DGA) Functional Group for Efficient Sorption of U(VI) and Th(IV) from Aqueous Medium
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INTRODUCTION
Radioactive wastes generated during various stages of nuclear fuel cycle generally contain actinides and various fission products in aqueous and nitric acid media. Accumulation of large volume of radioactive waste makes storage more risky and expensive. Therefore, these waste streams are treated to reduce their activity to a dischargeable level permitted as per national regulations. Conventional and recent methods for treating radioactive waste include solvent extraction, precipitation, ion
Effect of pH and nitric acid concentration on U(VI)/Th (IV) adsorption
pH of the solution is one of the dominant parameter controlling adsorption. Fig. 1(a) shows the adsorption of U(VI) and Th(IV) on DGA-PAMAMG3-SDB as a function of equilibrium pH. Adsorption of U(VI) at pH ≤ 3 is observed to be < 20% due to complete protonation of tertiary amino groups of PAMAM as well as weak interaction of amide and unionized DGA groups with solvated uranyl ions. For pH > 3, the ionization of DGA groups and deprotonation of tertiary amine groups increase the electron donating
Conclusion
A new DGA-PAMAM-SDB chelating resin was synthesized and its adsorption capacity dependent on contact time, pH, initial metal ion concentration and temperature were investigated. The chelating resin showed high adsorption efficiency even at high acidic medium. The maximum adsorption capacities of DGA-PAMAMG5-SDB chelating resin for U(VI) and Th(IV) was estimated to be 682 and 544.2 mg g−1 at pH 5.5 and 3.5 respectively. The aqueous phase free energy of complexation of DGA-PAMAMG1-SDB chelating
Acknowledgements
Authors sincerely thank Mr. B.N. Mohanty, Dr. Siva subramanian, Mr. H. Krishnan, RSD, Dr. Kamuruddin, MSG, IGCAR for their help during this work.
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