Kütahyali C.Çetinkaya B.Acar M.B.Işik N.O.Cireli T.2024-07-222024-07-22201218733336http://akademikarsiv.cbu.edu.tr:4000/handle/123456789/17720In 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..EnglishAdsorptionGeologic SedimentsKineticsMicroscopy, Electron, ScanningRadiation MonitoringRadioactive PollutantsSolutionsSpectroscopy, Fourier Transform InfraredStrontiumSurface PropertiesTurkeyVolcanic EruptionsKulaManisaTurkeyAdsorptionDesignDyesExperimentsHydrochloric acidMonolayersRadioactive wastesRadioactivityRadioisotopesRatingSorptionStrontiumWaste disposalhydrochloric acidstrontiumwaterAqueous phaseBatch experimentsBatch sorptionCentral composite designsContact timeCorrelation coefficientDistribution coefficientGeological disposalsInitial concentrationInput parameterKinetic dataLangmuir modelsMonolayer capacityNatural watersPerformance assessmentpH rangePseudo-second-order equationsRadionuclide migrationRock formationsSorption experimentsThermodynamic parameterVolcanicsaqueous solutionperformance assessmentpHradioactive wasteradionuclidesorptionstrontiumtemperature effectthermodynamicsadsorptionadsorption kineticsarticleconcentration (parameters)correlation coefficientisothermmathematical modelpHradioisotope distributionthermodynamicsvolcanoRadioactive waste disposalArticle10.1016/j.jhazmat.2011.11.047