title: Composite polymeric beads containing N,N,N',N'-tetraoctyldiglycolamide for actinide ion uptake from nitric acid feeds: Batch uptake, kinetic modelling and column studies.
abstract: Polyethersulphone (PES) based composite polymeric beads (CPB) containing TODGA (N,N,N',N'-tetraoctyldiglycolamide) as the extractant were prepared by conventional phase inversion technique and were tested for the uptake of actinide ions such as Am(3+), UO2(2+), Pu(4+), Np(4+) and fission product ions such as Eu(3+) and Sr(2+). The CPBs containing 2.5-10wt.% TODGA were characterized by various physical methods and their porosity, size, surface morphology, surface area and the degradation profile by thermogravimetry were analyzed. The batch uptake studies involved kinetics of metal ion sorption, uptake as a function of nitric acid concentration, kinetic modelling and adsorption isotherms and most of the studies involved the Am(3+) ions. The batch saturation sorption capacities for Eu(3+) loading at 3M HNO3 were determined to be 6.6±0.02, 9.1±0.02 and 22.3±0.04mgg(-1) of CRBs with 2.5wt.%, 5wt.% and 10wt.% TODGA, respectively. The sorption isotherm analysis with Langmuir, D-R and Freundlisch isotherms indicated chemisorption monolayer mechanism. Chromatographic studies indicated breakthrough of Eu(3+) (using a solution containing Eu carrier) after about 0.75 bed volume (3.5-4mL). Elution of the loaded Eu was carried out using 0.01M EDTA as the eluent.
authors.affiliation: Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India.
authors.forename: R B
authors.initials: RB
authors.lastname: Gujar
authors.affiliation: Radiochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India. Electronic address: mpatra@barc.gov.in.
authors.forename: P K
authors.initials: PK
authors.lastname: Mohapatra
authors.affiliation: Institute on Membrane Technology (ITM-CNR), c/o University of Calabria, Via P. Bucci, 17/c, 1-87030 Rende, CS, Italy.
authors.forename: D Shanthana
authors.initials: DS
authors.lastname: Lakshmi
authors.affiliation: Institute on Membrane Technology (ITM-CNR), c/o University of Calabria, Via P. Bucci, 17/c, 1-87030 Rende, CS, Italy. Electronic address: a.figoli@itm.cnr.it.
authors.forename: A
authors.initials: A
authors.lastname: Figoli
mesh_terms: D008671:Actinoid Series Elements / Q000737:chemistry*; D000327:Adsorption; D002412:Cations; D006016:Glycolates / Q000737:chemistry*; D007700:Kinetics; D017942:Nitric Acid / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D052616:Solid Phase Extraction; D012996:Solutions; D013450:Sulfones / Q000737:chemistry*
chemical_list: D008671:Actinoid Series Elements; D002412:Cations; D006016:Glycolates; D011108:Polymers; D012996:Solutions; D013450:Sulfones; C520173:tetra-n-octyldiglycolamide; C022840:polyether sulfone; D017942:Nitric Acid
keywords: Actinides; Polysulphone; Separation; Solid phase extraction; TODGA