Optimization of hydrothermal synthesis of pharmacosiderite-type titanosilicates for extraction of 137Cs and 90Sr from liquid media with high salinity

The paper presents the synthesis of and the influence of the duration of hydrothermal synthesis on the sorption properties of pharmacosiderite type titanosilicates towards Cs(I) and Sr (II), structural phase composition, surface morphology and textural characteristics is investigated. The composition, morphology and structure of the samples were studied by XRF, SEM, and EMF methods. The structural characteristics of powders have been studied by BET and DFT methods. The sorption properties towards the radionuclide 137Cs in micro-concentration under adsorption conditions from model solutions of low and medium concentration of interfering impurities are investigated for the first time for disubstituted pharmacosiderite-type titanosilicates.