Abstract
The prediction of the adsorption behavior of natural composite materials was studied by a single mineral approach. The adsorption of U(VI) on single minerals such as goethite, hematite, kaolinite and quartz was fully modeled using the diffuse-layer model in various experimental conditions. A quasi-thermodynamic database of surface complexation constants for single minerals was established in a consistent manner. In a preliminary work, the adsorption of a synthetic mixture of goethite and kaolinite was simulated using the model established for a single mineral system. The competitive adsorption of U(VI) between goethite and kaolinite can be well explained by the model. The adsorption behavior of natural composite materials taken from the Koongarra uranium deposit (Australia) was predicted in a similar manner. In comparison with the synthetic mixture, the prediction was less successful in the acidic pH range. However, the model predicted well the adsorption behavior in the neutral to alkaline pH range. Furthermore, the model reasonably explained the role of iron oxide minerals in the adsorption of U(VI) on natural composite materials.
Original language | English |
---|---|
Pages (from-to) | 405-412 |
Number of pages | 8 |
Journal | Journal of Radioanalytical and Nuclear Chemistry |
Volume | 242 |
Issue number | 2 |
DOIs | |
Publication status | Published - 1999 |
Externally published | Yes |
Bibliographical note
Funding Information:Fig. 7. Adsorption of U(VI) on Koongarra samples in the open system. Background electrolyte is 0.1M KNO3, U(VI) concentration is 5 I0-SM. Points are experimental data and lines are modeling results (a). Simulated distribution of U(VI) between single mineral components in sample W7 (b) This work was funded by the Nuclear R&D program of MOST, Korea. Professor Soo-Jin K1M in the department of Geological Sciences, Seoul National University is greatly acknowledged for his support on XRD analysis.
ASJC Scopus subject areas
- Analytical Chemistry
- Nuclear Energy and Engineering
- Radiology Nuclear Medicine and imaging
- Pollution
- Spectroscopy
- Public Health, Environmental and Occupational Health
- Health, Toxicology and Mutagenesis