Sorption of cesium ions by nanostructured calcium aluminosilicates

Abstract

Data on the sorption properties of synthetic calcium aluminosilicates (CASes) with Al: Si ratios of 2: 2, 2: 6, and 2: 10, fabricated within the multicomponent system CaCl₂–AlCl₃–KОН–SiO₂–H₂O, are presented. Isotherms of the sorption of Cs⁺ ions from aqueous solutions with Cs⁺ concentrations of 0.2 to 6.0 mmol L^–1 are analyzed. The CAS maximum sorption capacity and the Langmuir constants are determined. Kinetic data are obtained, and the energy of cation-exchange activation upon the sorption of Cs⁺ ions is determined. The effect of a salt background (1% KCl + 6% NaCl) has on the values of distribution coefficient (K_d) and the degree of Cs⁺ ion removal is established.