Adsorption of cesium ions from aqueous solutions on modified clay of the Levashinsky deposit of the Republic of Dagestan
Abstract
The problem of extracting and concentrating of rare alkali (Rb+, Cs+) and alkaline earth metals (Sr2+) arises both during the development of geothermal waters and during the purification of natural and wastewater from nuclear power plants from long-lived radionuclides. The need for effective sorbents to solve these problems makes it urgent to expand the range of raw materials for sorbents based on mineral raw materials. Among natural sorbents for purifying solutions from cesium radionuclides, clays of different compositions have proven themselves well, and it is noted that illite has the greatest selectivity to Cs+, the content of which in the native clay of the Levashinsky deposit of the Republic of Dagestan is ~ 32%. An important task is to find effective methods for improving the physicochemical properties and sorption characteristics of natural raw materials, which involves treating the original clay with various acids (mainly HCl) and salts (Na+, K+, Ca2+, Fe2+). The purpose of this work is studying the sorption properties of clay from the Levashinsky deposit of the Republic of Dagestan modified with sodium chloride for Cs+ ions. The work used a technique for modifying the original clay with sodium chloride, which involves preliminary acid activation of the original clay. The study of ion adsorption was carried out in model solutions in a limited volume, varying the concentration of the studied ions in solutions from 5 to 700 mg/dm3. It was found that treatment of the studied clay, previously subjected to acid activation, with a NaCl solution leads to an increase in its sorption capacity for Cs+ by ~ 1.3 times and promotes the involvement of highly selective with respect to Cs+ ions FES centers (Frayed Edge Sites) in the adsorption process. The influence of the ionic strength of the solution and the concentration of individual ions on the sorption of cesium has been established.
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