Optimization of Nb-substitution and Cs+/Sr+2 ion exchange in crystalline silicotitanates (CST)
| Autor: | S. Chitra, Awadhesh Mani, R. Sudha, S. Kalavathi, S. V. S. Rao, Pradeep Kumar Sinha |
|---|---|
| Rok vydání: | 2012 |
| Předmět: |
Strontium
Aqueous solution Ion exchange Health Toxicology and Mutagenesis Kinetics Public Health Environmental and Occupational Health Niobium chemistry.chemical_element Pollution Analytical Chemistry Partition coefficient Nuclear Energy and Engineering chemistry Caesium Cation-exchange capacity Radiology Nuclear Medicine and imaging Spectroscopy Nuclear chemistry |
| Zdroj: | Journal of Radioanalytical and Nuclear Chemistry. 295:607-613 |
| ISSN: | 1588-2780 0236-5731 |
| DOI: | 10.1007/s10967-012-1812-0 |
| Popis: | Crystalline silicotitanate inorganic ion exchanger, with a sitinakite structure is a candidate material for remediation of aqueous nuclear waste streams. Niobium substituted crystalline silicotitanates (Nb-CST) with varying concentrations of Nb (2, 4, 8, 12 and 24 mmol) and with constant concentrations of Ti-12 mmol, Si-16 mmol, Na-165 mmol were prepared hydrothermally and the products were characterized using techniques viz., XRD, SEM/EDS, DTA/TGA, surface area respectively. Batch experiments were carried out to study the kinetics of uptake of Cs137 and Sr90, to estimate the decontamination factor (DF) values and distribution coefficients (K d) for the above synthesized Nb-CST samples from actual radioactive waste solutions. The DF values for uptake of Cs and Sr by Nb-CST for the optimized Nb-concentration of 4 mmol after 24 h of equilibration was 355 and 136 respectively. The K d values for uptake of Cs and Sr for Nb-CST (Nb-4 mmol) after 24 h of equilibration was found to be 35,490 and 13,500 ml/g respectively. The ion exchange capacity of Nb-CST (Nb-4 mmol) towards Sr 90 and Cs137 was estimated to be 11.8 and 3.2 meq/g respectively. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink