Structural modification of manganese(III, IV) oxides in synthesis of sorbents selective to strontium

Sorbents selective to strontium ions and radionuclides were synthesized by thermal modification of manganese(III, IV) oxides with birnessite structure containing Sr2+ ions. The sequence of phase transitions in the birnessite-psilomelane-cryptomelane-strontium permanganite system was determined by thermal and X-ray diffraction analyses. The psilomelane phase was selected as a basis for obtaining sorbents since it provided the best sorption properties of the resulting materials. The temperature conditions of the synthesis were substantated.