title: Removal of americium from aqueous nitrate solutions by sorption onto PC88A-impregnated macroporous polymeric beads.
abstract: The removal of Am (III) ions from aqueous solutions was studied by solid-liquid extraction using indigenously synthesized Extractant Impregnated Macroporous Polymeric Beads (EIMPBs). These beads were prepared by an in situ phase inversion method using polyethersulfone (PES) as base polymer and 2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester (PC88A) as an extractant. The synthesized EIMPBs were characterized by FTIR, TGA and SEM techniques. The batch equilibration study using these beads for the uptake of Am (III) was carried out as a function of parameters, like pH, equilibration time, Am (III) concentration, etc. The blank polymeric beads, without PC88A, have shown negligible sorption of Am (III) under the experimental conditions. The experimental data on the sorption behavior of Am (III) on the polymeric beads fitted well in the pseudo-second-order kinetics model. The synthesized polymeric beads exhibited very good sorption capacity for Am (III) at pH 3. The reusability of the beads was also ascertained by repetitive sorption/desorption of Am (III) up to 10 cycles of operation, without any significant change in their sorption characteristics.
authors.affiliation: Fuel Reprocessing Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 India.
authors.forename: S K
authors.initials: SK
authors.lastname: Pathak
authors.affiliation: Fuel Reprocessing Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 India. Electronic address: sct@barc.gov.in.
authors.forename: S C
authors.initials: SC
authors.lastname: Tripathi
authors.affiliation: Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.
authors.forename: K K
authors.initials: KK
authors.lastname: Singh
authors.affiliation: Fuel Reprocessing Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 India.
authors.forename: A K
authors.initials: AK
authors.lastname: Mahtele
authors.affiliation: Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Trombay, Mumbai, India.
authors.forename: Manmohan
authors.initials: M
authors.lastname: Kumar
authors.affiliation: Fuel Reprocessing Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085 India.
authors.forename: P M
authors.initials: PM
authors.lastname: Gandhi
mesh_terms: D000327:Adsorption; D000576:Americium / Q000737:chemistry*; D009566:Nitrates / Q000737:chemistry*; D063065:Organophosphonates / Q000737:chemistry*; D011108:Polymers / Q000737:chemistry*; D011850:Radioactive Waste; D012996:Solutions; D013450:Sulfones / Q000737:chemistry*; D018505:Waste Management / Q000379:methods
chemical_list: C551984:2-ethylhexyl phosphonic acid mono-2-ethylhexyl ester; D009566:Nitrates; D063065:Organophosphonates; D011108:Polymers; D011850:Radioactive Waste; D012996:Solutions; D013450:Sulfones; C022840:polyether sulfone; D000576:Americium
keywords: Am (III); PC88A; Polymeric beads; Solid–liquid extraction; Sorption