Investigation of strontium sorption onto Kula volcanics using Central Composite Design
| Autor: | Nuray Olcay Işık, M. Bahadır Acar, Berkan Çetinkaya, Ceren Kütahyalı, İrfan Cireli |
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| Rok vydání: | 2012 |
| Předmět: |
Geologic Sediments
Environmental Engineering Turkey Central composite design Surface Properties Health Toxicology and Mutagenesis Analytical chemistry chemistry.chemical_element Volcanic Eruptions Endothermic process symbols.namesake Adsorption Radiation Monitoring Spectroscopy Fourier Transform Infrared Monolayer Environmental Chemistry Waste Management and Disposal Strontium Chemistry Langmuir adsorption model Sorption Pollution Solutions Partition coefficient Kinetics Microscopy Electron Scanning symbols Radioactive Pollutants Nuclear chemistry |
| Zdroj: | Journal of Hazardous Materials. :115-124 |
| ISSN: | 0304-3894 |
| DOI: | 10.1016/j.jhazmat.2011.11.047 |
| Popis: | In performance assessment studies, the uptake of the radioactive elements by rock formations play an important role in retarding their aqueous phase migration. Sorption studies of radionuclides have been conducted to obtain data on the distribution coefficient ( K d ) that is as an input parameter in the performance assessment of the geological disposal of radioactive wastes. In this work, sorption experiments were studied in a batch sorption system using Sr(NO 3 ) 2 solution on non-treated and HCl-treated Kula volcanics. The distribution coefficient ( K d ) values of Sr 2+ derived from batch experiments were used to evaluate the migration behavior of Sr 2+ . Central Composite Design was used in the experiments. Sr sorption was studied as a function of pH, temperature, initial concentration of adsorbate and contact time. The results show that the K d values are higher at pH 7–9 which is the pH range of the natural waters. The kinetic data conformed better to the pseudo-second-order equation. Thermodynamic parameters Δ H °, Δ S ° and Δ G ° were estimated and these parameters show that adsorption is endothermic. The correlation coefficients indicate that the Langmuir model fits better for the strontium sorption onto non-treated and HCl-treated Kula volcanics with monolayer capacities as 2.04 and 1.72 mg/g, respectively. |
| Databáze: | OpenAIRE |
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