Sorption behavior of curium(III) on hydrous silica: a kinetic and thermodynamic study
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P.N. Pathak
Sorption of tracer curium, Cm3+, on SiO2· H2O (silica gel) was investigated under different experimental conditions such as time of equilibration, concentration of Sm3+, pcH, and temperature. Sm3+ was used as a carrier for Cm3+ ions in this study. From the sorption kinetics data, the diffusion coefficient of Cm3+ ion was calculated to be 1.20(±0.05)×10-11 m2s-1 under particle diffusion-controlled conditions. The sorption rate was determined to be 3.47(±0.19)×10-3 s-1 at 298 K, pcH 5.25(±0.03) in 0.20 M (NaClO4). The sorption data were fitted in Freundlich, Langmuir and Dubinin–Radushkevich (D–R) isotherms. A synergistic enhancement in the sorption of Cm3+(Sm3+)-ligand (e.g., CO32-, F-, H2PO4- and C2O42-) complexes on silica gel was observed. The presence of these anions increase the sorption of Cm3+(Sm3+) in the following order: CO32- < F- < C2O42- < H2PO4-. Temperature variation experiments gave enhanced sorption with increased temperature for Cm3+ indicating an endothermic enthalpy.
© Oldenbourg Wissenschaftsverlag
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Articles in the same Issue
- Yield and excitation function measurements of some nuclear reactions on natural thallium induced by protons leading to the production of medical radioisotopes 201Tl and 203Pb
- Production of no-carrier-added 123I via heavy-ion activation of natural antimony oxide
- Sorption behavior of curium(III) on hydrous silica: a kinetic and thermodynamic study
- Study of the solubility of amorphous and crystalline uranium dioxide by combined spectroscopic methods
- Complexation of uranium(VI) with aromatic acids in aqueous solution – a comparison of hydroxamic acids and benzoic acid
- N,N,N′,N′-tetraoctyl-3-oxapentane-1,5-diamide impregnated magnetic particles for the uptake of lanthanides and actinides from nuclear waste streams
- A new time-resolved laser-induced fluorescence spectrometry (TRLFS) data acquisition procedure applied to the uranyl-phosphate system
- Comparative study on ion-isotopic exchange reaction kinetics by application of tracer technique
- Kinetics of isotopic exchange between calcium molybdate and molybdate ions in aqueous solution
- Separation of 137mBa from its parent 137Cs from an equilibrium mixture using amide incorporated Amberlite IRC-50
