The physicochemical properties of the carboxyl cation exchanger Tokem-200, sulfonic cation exchanger Tokem-140 and their selectivity with respect to the Ca ion 2+ under equilibrium conditions were investigated, the sol-gel method from solutions synthesized spherical biomaterials based on Tokem- 200. The framework of the material is represented by TiO 2 -SiO 2 , and the inner part is filled with Ca 2+ oxide (sample TiO 2 - SiO 2 / CaO). Carboxyl cation exchanger Tokem-200 has the highest selectivity for Ca 2+ ions in contrast to Tokem-140, which makes it promising for the creation of biomaterials. It was found that the solutions are suitable for obtaining materials for up to 5 days.
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