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Sorption of Am(III) and Eu(III) onto γ-alumina: experiment and modelling
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Thomas Rabung
Published/Copyright:
September 25, 2009
The present paper describes the surface complexation behaviour of trivalent metal ions, Am(III) and Eu(III), on well characterised γ-alumina. Experiments are conducted at different pH (4-8) and ionic strength (0.001 - 0.1 M NaClO4) either in the presence or absence of CO2. By varying the metal ion concentration from 10-9 to 10-4 mol/L, the sorption isotherm is established under each given experimental condition. Different surface complexation models are applied to the experimental results to interpret and appraise the surface sorption processes under different experimental conditions. A comparison of the present results is made with the Eu(III) sorption onto the hematite mineral surface investigated previously. It has been shown that sorption properties of hematite and γ-alumina seem to be quite similar. For both systems, a good agreement is found between experimental data and modelling, once using the two site surface complexation model and the same complexation constants for the respective monodentate surface complex. The Eu(III) sorption reaction is additionally studied in-situ by time resolved laser fluorescence spectroscopy (TRLFS). Formation of inner-sphere complexes can be deduced from the emission spectra. The continuous increase of the fluorescence life time with increasing pH starting from pH = 5.0 indicates that surface complexation is accompanied by a decreasing number of hydration water in the first coordination sphere.
Published Online: 2009-9-25
Published in Print: 2000-9-1
© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München
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Articles in the same Issue
- Preface: Migration Conference 1999
- The influence of near field hydrogen on actinide solubilities and spent fuel leaching
- Experimental determination and chemical modelling of radiolytic processes at the spent fuel/water interface
- Thermodynamic data for the solubility of tin(IV) in aqueous cementitious environments
- Leaching behaviour of UO2 containing α-emitting actinides
- Dehydration of synthetic autunite hydrates
- Aqueous dissolution kinetics of pyrochlore, zirconolite and brannerite at 25, 50, and 75 °C
- Complex formation of Np(V) with humic acid and polyacrylic acid
- Investigation of humic acid complexation behavior with uranyl ions using modified synthetic and natural humic acids
- Solution coordination chemistry of uranium in the binary UO22+-SO42- and the ternary UO22+-SO42--OH- system
- The speciation of Tc(IV) in chloride solutions
- The hydrolysis of uranium(VI) in sulfate media
- Complex formation of Eu(III) with polyacrylic acid
- Determination of Co(II) and Ni(II)-humate stability constants at high ionic strength NaCl solutions
- Analysis of Th(IV)-humate by XPS
- EXAFS structural analysis of aqueous uranium(VI) complexes with lignin degradation products
- Thermodynamic modeling of metal-ligand interactions in high ionic strength NaCl solutions: the Co2+-oxalate system
- Mixed Ca2+/UO22+/CO32- complex formation at different ionic strengths
- Humic colloid-borne Np migration: influence of the oxidation state
- Reduction of Pu(V) by humic acid
- Colloid-borne uranium and other heavy metals in the water of a mine drainage gallery
- Application of LIBD to the determination of the solubility product of thorium(IV)-colloids
- The Rossendorf Beam Line ROBL – a dedicated experimental station for XAFS measurements of actinides and other radionuclides
- Extended X-ray absorption fine structure and time differential perturbed angular correlation study of hafnium(IV) sorbed onto amorphous silica
- Speciation analysis on europium(III) using laser-induced breakdown spectroscopy
- The migration behavior of Np(V) in sandy soil and granite media in the presence of humic substances
- Uranium(VI) and neptunium(V) transport through fractured, hydrothermally altered concrete
- Experimental study and modeling of uranium (VI) transport through ferrous olivine rock columns
- Aqueous Pu(IV) sorption on brucite
- Surface spectroscopic studies of Cs+, and Ba2+ sorption on chlorite-illite mixed clay
- Approaches to modelling uranium(VI) adsorption on natural mineral assemblages
- Evaluation of radioactive nickel distribution coefficient by analyzing background stable nickel
- Application of electrokinetic data to test the adsorption models
- Sorption equilibrium and kinetics of NpO2+ on dispersed particles of Na-montmorillonite
- Sorption of Am(III) and Eu(III) onto γ-alumina: experiment and modelling
- Effects of humic acid on the sorption of Am(III) and Cm(III) on kaolinite
- Uranium(VI) sorption onto phyllite and selected minerals in the presence of humic acid
- The partitioning of uranium and neptunium onto hydrothermally altered concrete
- Alteration products of uraninite from the Colorado Plateau
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- Fracture smectite as a long-term sink for natural radionuclides – indications from unusual U-series disequilibria
- The potential of subterranean microbes in facilitating actinide migration at the Grimsel Test Site and Waste Isolation Pilot Plant
- Application of gel electrophoretic techniques to the investigation of actinide-humic interactions in soils
- Applications of NAA, PIXE and XPS for the quantification and characterization of the humic substances/iodine association
- Quantitative assessment of radiocaesium bioavailability in forest soils
- Actinide partitioning to an acidic, sandy lake sediment
- Adsorption of Cs and U(VI) on soils of the Australian arid zone
- Natural and artificial radionuclides in forest and bog soils: Tracers for migration processes and soil development
- Distribution of natural radionuclides during the processing of phosphate rock from Itataia-Brazil for production of phosphoric acid and uranium concentrate
- An electrostatic approach for the prediction of actinide complexation constants with inorganic ligands-application to carbonate complexes
- Determination and uncertainties of radioelement solubility limits to be used by SKB in the SR 97’ performance assessment exercise
