Shahwan, T.Erten, H. N.2016-02-082016-02-0820040236-5731http://hdl.handle.net/11693/24239The sorption of Ba2+ ion on natural kaolinite and chlorite-illite clays was investigated at different initial concentrations and temperatures using the radiotracer method. The sorption data were well described by Freundlich and Dubinin-Radushkevich isotherms. Ba2+ sorption on both clays showed an exothermic behavior with ΔH° (kJ/mol) values being -7 and -5 for sorption on kaolinite and chlorite illite mixed clay, respectively. The ΔG° values indicate that the sorption was spontaneous with sorption energies corresponding to ion-exchange type sorption. X-ray diffraction studies showed that no significant change in the matrix of the clays occurred upon Ba2+ sorption.EnglishAluminum silicateBarium ionChlorine derivativeTracerConcentration (parameters)Ion exchangeIsothermTemperature sensitivityX ray diffractionArticle10.1023/B:JRNC.0000027059.66424.b4