Selective Extraction of Actinides Using EEBEHBA Grafted Polymer: A Green Process for Nuclear Reprocessing Program

Autor: M. Akhila Maheswari, M. S. Subramanian
Rok vydání: 2005
Předmět:
Lanthanide
Grafting (chemical)
Magic angle
synthesis
Polymers
General Chemical Engineering
Analytical chemistry
Extraction
metal ion
Nuclear magnetic resonance
thorium
chemistry.chemical_compound
Fourier transformation
Polarization
extraction process
Amide
infrared spectroscopy
Rare earth elements
Reaction kinetics
chemistry.chemical_classification
CHN elemental analysis
Monazite sand
Data reduction
Chemistry
Fourier transform infrared spectroscopy
radioactive waste disposal
Nuclear magnetic resonance spectroscopy
Polymer
unclassified drug
Nuclear reprocessing
amine
polymerization
Sorption
resin
flow rate
Selectivity
Ion exchange
Resins
benzene derivative
polymer
4-ethoxy-4-ethyl-N
N- bis-2-ethylhexylbutanamide (EEBEHBA)
Filtration and Separation
Quantitative desorption
radioactive waste processing
Actinides
uranium
acid medium
styrene derivative
actinide
Process Chemistry and Technology
Extraction (chemistry)
4 ethoxy 4 ethyl n
n bis 2 ethylhexylbutanamide
General Chemistry
carbon nuclear magnetic resonance
amide
kinetics
chemical structure
Acids
Nuclear chemistry
Zdroj: Separation Science and Technology. 39:3621-3638
ISSN: 1520-5754
0149-6395
Popis: A new amide grafted polymer has been developed using Merrifield chloromethylated resin (inert solid support) anchored with 4-ethoxy-4-ethyl-N,N- bis-2-ethylhexylbutanamide (EEBEHBA), for the selective extraction of actinides from lanthanides in acidic matrices. The polymer has been characterized using 13C- CPMAS (cross-polarized magic angle spin) NMR spectroscopy, FT-NIR spectroscopy, and also by CHN elemental analysis. The fabricated polymeric sorbent shows greater selectivity in extracting U(VI) over Th(IV) and other lanthanides, even under high acidities (2-4 M HNO 3). The grafted polymer offers good distribution ratio (D) values for actinides of interest over a wide range of solution acidity, with the maximum metal sorption capacity being 0.629 mmol g -1 and 0.214 mmol g -1 for U(VI) and Th(IV), respectively, in 4 M HNO 3 medium. The functionalized resin matrix shows moderately fast metal ion phase exchange kinetics, with t 1/2 values < 3 min for both the analytes. The notable feature of the resin is the quantitative desorption of actinides using distilled water as eluant, a simple green process of recovery which has not yet been reported in the literature using polymeric sorbents. The practical utility has been tested using synthetic low-level nuclear reprocessing mixtures and also with real samples like monazite sand. The analytical data obtained from triplicate measurements are within 3.6% rsd reflecting the reproducibility and reliability of the developed method.
Databáze: OpenAIRE
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