Sorption of Uranyl Ions on Hydrous Silicon Dioxide

  title={Sorption of Uranyl Ions on Hydrous Silicon Dioxide},
  author={Κ. H. Lieser and S. Quandt-Klenk and Brunhilde Thybusch},
Sorption of uranyl ions on Si02 • x H 2 0 (silica gel) is investigated in absence and in presence of carbonate as function of pH. The curves obtained are very similar to those observed for sorption of uranyl ions on Ti0 2 • xH 2 0 , indicating the dominating influence of the uranium species in solution. Between pH 2 and 5 the sorption ratio Rs increases with hydrolysis of uranyl ions (formation of U 0 2 0 H + ) , around pH 7 it is nearly independent of pH, and at higher pH it decreases again… 

Figures from this paper

The sorption of uranyl ions on silica-titania mixed-hydroxide gels
AbstractSiO2−TiO2 mixed hydroxide gels were prepared and the apparent adsorption capacity for Na+ (1.30–1.60 mmol/g dry sample) determined by pH titration. The effect of solution pH on the sorption
Sorption of uranyl(VI) cations on suspended silicate: effects of N-donor ligands, carboxylic acids, organic cosolvents, and metal ions
Sorption of uranyl ion, UO22+, on silicate particles (3.00g/L) was studied in sodium perchlorate solution as a function of pcH and ionic strength at 298 K. The effects of different ligands (e.g.,
Kinetics and thermodynamics of uranium(VI) sorption on hydrous silica
Sorption of uranyl ion, UO22+, on SiO2·x H2O (silica gel) has been investigated as a function of time, amount of silica gel (0.10–0.60g), uranium concentration (5.00×10−5–1.00×−3M), ionic strength
Equilibrium and kinetics of calcium–uranyl–carbonate adsorption on silica nanoparticles
The present work focuses on studying U(VI) adsorption to silica nanoparticles at neutral to weakly alkaline pH and in the presence of calcium and carbonate ions, i.e. when calcium–uranyl–carbonate
Adsorption of aqueous uranyl complexes onto Bacillus subtilis cells.
Thermodynamic modeling of the data suggests that uranylhydroxide, uranyl-carbonate, and calcium-uranylcarbonate species each can form stable surface complexes on the bacterial cell wall, which could dramatically alter predictions of uranium mobility in near-surface environments.
Sorption of uranyl ions on silica: Effects of contact time, pH, ionic strength, concentration and phosphate
The sorption of UO22+ and phosphate on silica were simultaneously studied. The effect of contact time between the solid phase and aqueous solution, pH and ionic strength on the UO22+ sorption in the
Sorption of uranyl ion on hydrous silica: Effects of ionic strength and ethylenediaminetetraacetic acid (EDTA)
The effects of ionic strength and of ethylenediamin et etraacetic acid (EDTA) on the sorption of uranyl ion, UO22+, to SiO2·xH2O (silica gel) were investigated. It was observed that pH and the ions
Effect of sulfate, carbonate, and phosphate on the uranium(VI) sorption behavior onto bentonite
Summary Batch experiments were conducted to study the uranium U(VI) sorption onto bentonite as a function of pH (3 to 8), and initial U(VI) concentrations (5 × 10−6 and 5 × 10−5 M) in the presence
Impact of Alkaline Earth Metals on Aqueous Speciation of Uranium(VI) and Sorption on Quartz
The effect of Mg-, Ca-, and Sr–Uranyl-Carbonato complexes with respect to sorption on quartz was studied by means of batch experiments with U(VI) concentration of 0.126 × 10−6 M in the presence and


Sorption of uranyl ions on hydrous titanium dioxide
SummaryThe mechanism of the sorption of U on TiO2 · x H2O is investigated in absence and in presence of carbonate as function of pH. Speciation of U in solution and the state of the surface of TiO2 ·
Surface Complexation Modelling of Uranium Sorption Data Obtained by Isotope Exchange Techniques
Uranyl sorption on samples from the vicinity of two uranium ore deposits was studied using a batch adsorption technique, and the results modelled using the surface complexation approach. The use of a
Chemistry of Radioactive Cesium in the Hydrosphere and in the Geosphere
Cesium is sorbed with relatively high selectivity by clay minerals. Accordingly, in groundwaters Cs is found in high amounts in suspended matter or in colloids, if these consist of or contain clay
Mineral-Solution Interactions in the U(VI)-CO2-H2O System
Interactions between U(VI) and calcite appear to be limited to adsorption reactions at the surface. U(VI) is concentrated at the calcite solution-interface at slightly alkaline pH. However, its
Thermodynamic Modelling of the Effect of Organic Complexants on Sorption Behaviour
The results of an experimental study of the sorption of uranium onto clay at pH 8 and pH 11 have been successfully simulated using a triple layer sorption model. The model has been incorporated in a