Sorption of Strontium Ions on Barium Silicates from Solutions of Complex Salt Composition

Abstract

The comparative analysis of sorption properties of nanostructured barium silicates obtained in multicomponent systems BaCl₂ · 2H₂O–КОН–SiO₂–H₂O and BaCl₂ · 2H₂O–КОН–SiO₂–AlCl₃–H₂O has been performed to extend previous data; the data on the composition and morphology of the systems have been presented. Their properties toward sorption of Sr²⁺ ions from solutions of complex ionic composition have been studied. It has been found that synthetic barium silicates and alumosilicates have high sorption and kinetic characteristics under static sorption conditions. The maximal degree of Sr²⁺ ions recovery from solutions of complex composition (>99%) was achieved for barium silicate BaSiO₃ · 2.3H₂O. The samples of barium alumosilicate BaAl₂Si₂O₈ · 2.6H₂O have the same sorption characteristics within measurement error. It has been shown that the studied sorbents, allowing for their kinetic properties, may be recommended for the deep purification of solutions of complex ionic composition, seawater including, from strontium ions under static conditions.