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Sorption equilibrium and kinetics of NpO2+ on dispersed particles of Na-montmorillonite

  • S. Nagasaki and S. Tanaka
Published/Copyright: September 25, 2009
Radiochimica Acta
From the journal Radiochimica Acta Volume 88 Issue 9-11

Sorption equilibrium and kinetics of NpO2+on dispersed particles of Na-montmorillonite were experimentally investigated by using a°batch technique and a°spectroscopic method, respectively. Considering the heterogeneity of sorption sites, we investigated the affinity spectra for the sorption of NpO2+ . It was found that the spectrum for NpO2+was monomodal but asymmetrical and that the half-width at half-maximum of the spectrum was relatively broad, indicating that the sorption sites of surface of Na-montmorillonite are strongly heterogeneous. From the kinetic spectrum for NpO2+ , two sorption processes could be distinguished. It was considered that the fast process is attributable to the sorption of NpO2+on the easily accessible outer surface of Na-montmorillonite particles and that the slower process is assigned to the sorption on the interlayer surface. Mean apparent activation enthalpies for the fast and the slow processes were evaluated as 19 ± 2 kJ/mol and 23 ± 3 kJ/mol, respectively.

Published Online: 2009-9-25
Published in Print: 2000-9-1

© 2015 Oldenbourg Wissenschaftsverlag GmbH, Rosenheimer Str. 145, 81671 München

Articles in the same Issue

  1. Preface: Migration Conference 1999
  2. The influence of near field hydrogen on actinide solubilities and spent fuel leaching
  3. Experimental determination and chemical modelling of radiolytic processes at the spent fuel/water interface
  4. Thermodynamic data for the solubility of tin(IV) in aqueous cementitious environments
  5. Leaching behaviour of UO2 containing α-emitting actinides
  6. Dehydration of synthetic autunite hydrates
  7. Aqueous dissolution kinetics of pyrochlore, zirconolite and brannerite at 25, 50, and 75 °C
  8. Complex formation of Np(V) with humic acid and polyacrylic acid
  9. Investigation of humic acid complexation behavior with uranyl ions using modified synthetic and natural humic acids
  10. Solution coordination chemistry of uranium in the binary UO22+-SO42- and the ternary UO22+-SO42--OH- system
  11. The speciation of Tc(IV) in chloride solutions
  12. The hydrolysis of uranium(VI) in sulfate media
  13. Complex formation of Eu(III) with polyacrylic acid
  14. Determination of Co(II) and Ni(II)-humate stability constants at high ionic strength NaCl solutions
  15. Analysis of Th(IV)-humate by XPS
  16. EXAFS structural analysis of aqueous uranium(VI) complexes with lignin degradation products
  17. Thermodynamic modeling of metal-ligand interactions in high ionic strength NaCl solutions: the Co2+-oxalate system
  18. Mixed Ca2+/UO22+/CO32- complex formation at different ionic strengths
  19. Humic colloid-borne Np migration: influence of the oxidation state
  20. Reduction of Pu(V) by humic acid
  21. Colloid-borne uranium and other heavy metals in the water of a mine drainage gallery
  22. Application of LIBD to the determination of the solubility product of thorium(IV)-colloids
  23. The Rossendorf Beam Line ROBL – a dedicated experimental station for XAFS measurements of actinides and other radionuclides
  24. Extended X-ray absorption fine structure and time differential perturbed angular correlation study of hafnium(IV) sorbed onto amorphous silica
  25. Speciation analysis on europium(III) using laser-induced breakdown spectroscopy
  26. The migration behavior of Np(V) in sandy soil and granite media in the presence of humic substances
  27. Uranium(VI) and neptunium(V) transport through fractured, hydrothermally altered concrete
  28. Experimental study and modeling of uranium (VI) transport through ferrous olivine rock columns
  29. Aqueous Pu(IV) sorption on brucite
  30. Surface spectroscopic studies of Cs+, and Ba2+ sorption on chlorite-illite mixed clay
  31. Approaches to modelling uranium(VI) adsorption on natural mineral assemblages
  32. Evaluation of radioactive nickel distribution coefficient by analyzing background stable nickel
  33. Application of electrokinetic data to test the adsorption models
  34. Sorption equilibrium and kinetics of NpO2+ on dispersed particles of Na-montmorillonite
  35. Sorption of Am(III) and Eu(III) onto γ-alumina: experiment and modelling
  36. Effects of humic acid on the sorption of Am(III) and Cm(III) on kaolinite
  37. Uranium(VI) sorption onto phyllite and selected minerals in the presence of humic acid
  38. The partitioning of uranium and neptunium onto hydrothermally altered concrete
  39. Alteration products of uraninite from the Colorado Plateau
  40. Fracture-filling minerals as uranium sinks and sources, a natural analogue study at Palmottu, Finland
  41. Spectroscopic properties of uranium(VI) minerals studied by time-resolved laser-induced fluorescence spectroscopy (TRLFS)
  42. Fracture smectite as a long-term sink for natural radionuclides – indications from unusual U-series disequilibria
  43. The potential of subterranean microbes in facilitating actinide migration at the Grimsel Test Site and Waste Isolation Pilot Plant
  44. Application of gel electrophoretic techniques to the investigation of actinide-humic interactions in soils
  45. Applications of NAA, PIXE and XPS for the quantification and characterization of the humic substances/iodine association
  46. Quantitative assessment of radiocaesium bioavailability in forest soils
  47. Actinide partitioning to an acidic, sandy lake sediment
  48. Adsorption of Cs and U(VI) on soils of the Australian arid zone
  49. Natural and artificial radionuclides in forest and bog soils: Tracers for migration processes and soil development
  50. Distribution of natural radionuclides during the processing of phosphate rock from Itataia-Brazil for production of phosphoric acid and uranium concentrate
  51. An electrostatic approach for the prediction of actinide complexation constants with inorganic ligands-application to carbonate complexes
  52. Determination and uncertainties of radioelement solubility limits to be used by SKB in the SR 97’ performance assessment exercise
https://doi.org/10.1524/ract.2000.88.9-11.705

Articles in the same Issue

  1. Preface: Migration Conference 1999
  2. The influence of near field hydrogen on actinide solubilities and spent fuel leaching
  3. Experimental determination and chemical modelling of radiolytic processes at the spent fuel/water interface
  4. Thermodynamic data for the solubility of tin(IV) in aqueous cementitious environments
  5. Leaching behaviour of UO2 containing α-emitting actinides
  6. Dehydration of synthetic autunite hydrates
  7. Aqueous dissolution kinetics of pyrochlore, zirconolite and brannerite at 25, 50, and 75 °C
  8. Complex formation of Np(V) with humic acid and polyacrylic acid
  9. Investigation of humic acid complexation behavior with uranyl ions using modified synthetic and natural humic acids
  10. Solution coordination chemistry of uranium in the binary UO22+-SO42- and the ternary UO22+-SO42--OH- system
  11. The speciation of Tc(IV) in chloride solutions
  12. The hydrolysis of uranium(VI) in sulfate media
  13. Complex formation of Eu(III) with polyacrylic acid
  14. Determination of Co(II) and Ni(II)-humate stability constants at high ionic strength NaCl solutions
  15. Analysis of Th(IV)-humate by XPS
  16. EXAFS structural analysis of aqueous uranium(VI) complexes with lignin degradation products
  17. Thermodynamic modeling of metal-ligand interactions in high ionic strength NaCl solutions: the Co2+-oxalate system
  18. Mixed Ca2+/UO22+/CO32- complex formation at different ionic strengths
  19. Humic colloid-borne Np migration: influence of the oxidation state
  20. Reduction of Pu(V) by humic acid
  21. Colloid-borne uranium and other heavy metals in the water of a mine drainage gallery
  22. Application of LIBD to the determination of the solubility product of thorium(IV)-colloids
  23. The Rossendorf Beam Line ROBL – a dedicated experimental station for XAFS measurements of actinides and other radionuclides
  24. Extended X-ray absorption fine structure and time differential perturbed angular correlation study of hafnium(IV) sorbed onto amorphous silica
  25. Speciation analysis on europium(III) using laser-induced breakdown spectroscopy
  26. The migration behavior of Np(V) in sandy soil and granite media in the presence of humic substances
  27. Uranium(VI) and neptunium(V) transport through fractured, hydrothermally altered concrete
  28. Experimental study and modeling of uranium (VI) transport through ferrous olivine rock columns
  29. Aqueous Pu(IV) sorption on brucite
  30. Surface spectroscopic studies of Cs+, and Ba2+ sorption on chlorite-illite mixed clay
  31. Approaches to modelling uranium(VI) adsorption on natural mineral assemblages
  32. Evaluation of radioactive nickel distribution coefficient by analyzing background stable nickel
  33. Application of electrokinetic data to test the adsorption models
  34. Sorption equilibrium and kinetics of NpO2+ on dispersed particles of Na-montmorillonite
  35. Sorption of Am(III) and Eu(III) onto γ-alumina: experiment and modelling
  36. Effects of humic acid on the sorption of Am(III) and Cm(III) on kaolinite
  37. Uranium(VI) sorption onto phyllite and selected minerals in the presence of humic acid
  38. The partitioning of uranium and neptunium onto hydrothermally altered concrete
  39. Alteration products of uraninite from the Colorado Plateau
  40. Fracture-filling minerals as uranium sinks and sources, a natural analogue study at Palmottu, Finland
  41. Spectroscopic properties of uranium(VI) minerals studied by time-resolved laser-induced fluorescence spectroscopy (TRLFS)
  42. Fracture smectite as a long-term sink for natural radionuclides – indications from unusual U-series disequilibria
  43. The potential of subterranean microbes in facilitating actinide migration at the Grimsel Test Site and Waste Isolation Pilot Plant
  44. Application of gel electrophoretic techniques to the investigation of actinide-humic interactions in soils
  45. Applications of NAA, PIXE and XPS for the quantification and characterization of the humic substances/iodine association
  46. Quantitative assessment of radiocaesium bioavailability in forest soils
  47. Actinide partitioning to an acidic, sandy lake sediment
  48. Adsorption of Cs and U(VI) on soils of the Australian arid zone
  49. Natural and artificial radionuclides in forest and bog soils: Tracers for migration processes and soil development
  50. Distribution of natural radionuclides during the processing of phosphate rock from Itataia-Brazil for production of phosphoric acid and uranium concentrate
  51. An electrostatic approach for the prediction of actinide complexation constants with inorganic ligands-application to carbonate complexes
  52. Determination and uncertainties of radioelement solubility limits to be used by SKB in the SR 97’ performance assessment exercise
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