The synthesis of a nanostructured magnetic aluminosilicate sorbent for the efficient removal of Sr from aqueous media has been investigated. The inorganic sorbent material was obtained by the co-precipitation method followed by hydrothermal treatment, resulting in the formation of a composite with FeO magnetic nanoparticles (5–10 nm) uniformly distributed within an amorphous aluminosilicate matrix (ratio 1 : 3). Structural studies confirmed a mesoporous morphology (specific surface area of 40 m/g) and thermal stability up to 1000°C. The sorbent exhibits superparamagnetic properties (18 emu/g), enabling its effective magnetic separation from treated solutions. The maximum sorption capacity for stable Sr ions reached 105 mg/g (Langmuir model), with high distribution coefficients for radionuclides K(Sr) = 2273–2368 mL/g, even in the presence of competing Ca ions (100 mg/L). The sorbent material is considered promising for the purification of liquid radioactive waste.
E. K. Papynov (2025) studied this question.