Investigation of strontium sorption onto Kula volcanics using Central Composite Design
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Date
2012
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Abstract
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 ΔH°, ΔS° and ΔG° 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 1.72mg/g, respectively. © 2011 Elsevier B.V..
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Adsorption , Geologic Sediments , Kinetics , Microscopy, Electron, Scanning , Radiation Monitoring , Radioactive Pollutants , Solutions , Spectroscopy, Fourier Transform Infrared , Strontium , Surface Properties , Turkey , Volcanic Eruptions , Kula , Manisa , Turkey , Adsorption , Design , Dyes , Experiments , Hydrochloric acid , Monolayers , Radioactive wastes , Radioactivity , Radioisotopes , Rating , Sorption , Strontium , Waste disposal , hydrochloric acid , strontium , water , Aqueous phase , Batch experiments , Batch sorption , Central composite designs , Contact time , Correlation coefficient , Distribution coefficient , Geological disposals , Initial concentration , Input parameter , Kinetic data , Langmuir models , Monolayer capacity , Natural waters , Performance assessment , pH range , Pseudo-second-order equations , Radionuclide migration , Rock formations , Sorption experiments , Thermodynamic parameter , Volcanics , aqueous solution , performance assessment , pH , radioactive waste , radionuclide , sorption , strontium , temperature effect , thermodynamics , adsorption , adsorption kinetics , article , concentration (parameters) , correlation coefficient , isotherm , mathematical model , pH , radioisotope distribution , thermodynamics , volcano , Radioactive waste disposal