title: Two novel extraction chromatography resins containing multiple diglycolamide-functionalized ligands: preparation, characterization and actinide uptake properties.
abstract: Two extraction chromatography resins were prepared for the first time by impregnating multiple diglycolamide-functionalized ligands such as diglycolamide-calix[4]arene (C4DGA) and tripodal diglycolamide (T-DGA) on Chromosorb-W, an inert solid support, for the removal of hazardous actinides like Am(III) from radioactive waste solutions at 3M nitric acid. The resins were characterized by SEM, thermal and surface area (BET) analyses. The sorption of Am(III) on the two resins followed pseudo-second order sorption rate kinetics and was exothermic in nature. The sorption of trivalent f-elements proceeded through a chemisorption monolayer phenomenon as analyzed by using several isotherm models. The negative free energy change (ΔG) values of -34.46 and -28.45kJ/mol for T-DGA and C4DGA, respectively, indicate a chemical interaction between the metal ions and the ligands on the surface of the resins. Distribution coefficient measurements of various metal ions showed a selective sorption of trivalent f-elements over hexavalent uranyl ions and other fission product elements. Column studies on breakthrough indicated 0.76 and 0.37mg/g as the breakthrough capacities of the T-DGA and the C4DGA resins, respectively. It was possible to quantitatively elute the loaded metal ion using EDTA solutions.
authors.affiliation: Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India.
authors.forename: Seraj A
authors.initials: SA
authors.lastname: Ansari
authors.affiliation: Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India. Electronic address: mpatra@barc.gov.in.
authors.forename: Prasanta K
authors.initials: PK
authors.lastname: Mohapatra
authors.affiliation: Laboratory of Molecular Nanofabrication, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
authors.forename: Mudassir
authors.initials: M
authors.lastname: Iqbal
authors.affiliation: Laboratory of Molecular Nanofabrication, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
authors.forename: Jurriaan
authors.initials: J
authors.lastname: Huskens
authors.affiliation: Laboratory of Molecular Nanofabrication, MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands.
authors.forename: Willem
authors.initials: W
authors.lastname: Verboom
mesh_terms: D008671:Actinoid Series Elements / Q000302:isolation & purification*; D047250:Calixarenes / Q000737:chemistry*; D002853:Chromatography, Liquid; D006016:Glycolates / Q000737:chemistry*; D007700:Kinetics; D008024:Ligands; D017942:Nitric Acid / Q000737:chemistry; D011850:Radioactive Waste
chemical_list: D008671:Actinoid Series Elements; D006016:Glycolates; D008024:Ligands; D011850:Radioactive Waste; D047250:Calixarenes; D017942:Nitric Acid
keywords: Actinides; Diglycolamides; Extraction chromatography; Separation; Sorption