title: Adsorption behavior of strontium on binary mineral mixtures of montmorillonite and kaolinite.
abstract: The adsorption behavior of kaolinite and montmorillonite minerals and their mixtures in respect of Sr ion were studied by means of a batch method using (90)Sr as a radio tracer. The effect of several parameters such as temperature, pH, Sr concentration and supporting electrolyte were investigated. Experimentally measured distribution coefficients showed a good agreement to within 98.5-99.7% with theoretically calculated values. The values of adsorption capacity of adsorbents and mean adsorption energy of adsorption were calculated by fitting the adsorption data to Dubinin-Radushkevich isotherm. The adsorption capacity of clay mixtures decreased as kaolinite fractions increased. The mean adsorption energy values of 8.0-9.5 kJ mol(-1) showed that adsorption was governed by ion exchange. The Freundlich parameters were used to characterize a site distribution function for binary exchange between Sr and Na.
authors.affiliation: Cekmece Nuclear Research and Training Center, P.K.1 34149, Atatürk Airport, Istanbul, Turkey.
authors.forename: Elvan
authors.initials: E
authors.lastname: Başçetin
authors.forename: Gülten
authors.initials: G
authors.lastname: Atun
mesh_terms: D000327:Adsorption; D045424:Complex Mixtures / Q000032:analysis / Q000737:chemistry; D003198:Computer Simulation; D007616:Kaolin / Q000032:analysis* / Q000737:chemistry*; D008422:Materials Testing / Q000379:methods; D008903:Minerals / Q000032:analysis* / Q000737:chemistry*; D008956:Models, Chemical; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D013326:Strontium Radioisotopes / Q000032:analysis* / Q000737:chemistry*
chemical_list: D045424:Complex Mixtures; D008903:Minerals; D013326:Strontium Radioisotopes; D007616:Kaolin