Data on the sorption characteristics of synthetic X-ray amorphous calcium silicate obtained in the CaCl2–Na2SiO3–H2O model multicomponent system are presented. The isotherms of sorption of Sr2+ ions from aqueous solutions without supporting salt at Sr2+ concentrations of 0.016 to 1.22 mmol/L at temperatures of 20, 40 and 60°C and the solid to liquid phase ratio S : L = 1 : 400 are presented. The maximum sorption capacities of synthetic X-ray amorphous calcium silicate and the recoveries of Sr2+ ions were determined for various S : L ratios and for solutions containing no supporting salt and solutions mimicking the specific composition of fresh water. The Sr2+ sorption kinetics at various temperatures was studied for the first time; and the activation energy of sorption was determined. The results can be used to develop practical recommendations for the production of this material and application in the processes of strontium sorption and immobilization.

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