Modelling of niobium sorption on clay minerals in sodium and calcium perchlorate solutions
-
,
Abstract
The sorption behaviour of niobium on kaolinite and illite minerals in sodium and calcium perchlorate solutions was evaluated with use of the mass distribution coefficient, Rd, obtained in batch sorption experiments. Very high distribution coefficient values, about 100 m3/kg, were obtained for both minerals in the neutral pH range between 6 and 8. Values were somewhat lower at pH 5. In NaClO4 solution, the sorption of niobium starts to decrease at pH higher than 8. This is in agreement with the increase, with pH, in the proportion of anionic niobate species, which are presumed to be low or non-sorbing. A similar decrease was not observed in Ca(ClO4)2 solution, probably owing to the influence of Ca on niobium solution speciation and surface species. The surface complexation model was applied to model the Rd values. The model fitted well for the NaClO4 solution but only at pH below 9 for the Ca(ClO4)2 solution. The discrepancy between the strong sorption of niobium in calcium-bearing solution at high pH and the calculated speciation is due in part to the non-inclusion of calcium niobate solution species and Ca-Nb compounds in the present NEA and other similar thermodynamic databases.
©2014 Walter de Gruyter Berlin/Boston
Artikel in diesem Heft
- Frontmatter
- Cm(III) sorption by silica: effect of alpha hydroxy isobutyric acid
- Spectroscopic study of Np(V) oxidation to Np(VI) in 3 mol/dm3 nitric acid at elevated temperatures
- Binary and ternary complexation of NpO2+ with carboxylate and aminocarboxylate ligands
- Sequestration of uranium on fabricated aluminum co-precipitated with goethite (Al-FeOOH)
- Analysis of barium borosilicate glass matrix for uranium determination by using ns-IR-LIBS in air and Ar atmosphere
- Synthesis of ordered mesoporous U3O8 by a nanocasting route
- Thermodynamic model for the solubility of BaSeO4(cr) in the aqueous Ba2+-SeO42−-Na+-H+-OH−-H2O system: Extending to high selenate concentrations
- Evaluation of a novel and efficient solvent system containing chlorinated cobalt dicarbollide for radio-cesium recovery from acidic wastes
- Modelling of niobium sorption on clay minerals in sodium and calcium perchlorate solutions
- Radioiodine labeled CdSe/CdS quantum dots: Lectin targeted dual probes
Artikel in diesem Heft
- Frontmatter
- Cm(III) sorption by silica: effect of alpha hydroxy isobutyric acid
- Spectroscopic study of Np(V) oxidation to Np(VI) in 3 mol/dm3 nitric acid at elevated temperatures
- Binary and ternary complexation of NpO2+ with carboxylate and aminocarboxylate ligands
- Sequestration of uranium on fabricated aluminum co-precipitated with goethite (Al-FeOOH)
- Analysis of barium borosilicate glass matrix for uranium determination by using ns-IR-LIBS in air and Ar atmosphere
- Synthesis of ordered mesoporous U3O8 by a nanocasting route
- Thermodynamic model for the solubility of BaSeO4(cr) in the aqueous Ba2+-SeO42−-Na+-H+-OH−-H2O system: Extending to high selenate concentrations
- Evaluation of a novel and efficient solvent system containing chlorinated cobalt dicarbollide for radio-cesium recovery from acidic wastes
- Modelling of niobium sorption on clay minerals in sodium and calcium perchlorate solutions
- Radioiodine labeled CdSe/CdS quantum dots: Lectin targeted dual probes
