Synthesis of composite zirconosilicate sorbents based on fly ash cenospheres and their sorption properties for Cs+, Pb2+ and Cd2+ cations for immobilisation in ceramic form : научное издание
Библиографическое описание:Synthesis of composite zirconosilicate sorbents based on fly ash cenospheres and their sorption properties for Cs+, Pb2+ and Cd2+ cations for immobilisation in ceramic form : научное издание / E. A. Kutikhina, T. A. Vereshchagina, A. A. Belov, O. O. Shichalin. - Текст : непосредственный // Chemistry for Sustainable Development. - 2025. - Т. 33, № 6. - P. 733-742. - The work was carried out within the State Assignment for the Institute of Chemistry and Chemical Technology SB RAS - subdivision of FRC KSC SB RAS (Project No. FWES-2021-0013 “Development of scientific foundations for the formation of functional materials with required properties on the basis of complex oxide systems and microspheres of energy ash”) and with financial support from the Ministry of Science and Higher Education of the Russian Federation for the Far Eastern Federal University (Project No. FZNS-2023-0003 “Synthesis and physicochemical investigation of ceramics”). - ISSN 1817-1818, DOI 10.15372/CSD2025710.
Аннотация:Hollow aluminosilicate microspheres (cenospheres) of stabilised composition (glass phase - 95.4 wt%; (SiO<sub>2</sub>/Al<sub>2</sub>O<sub>3</sub>)glass = 3.1) isolated from coal fly ashes from coal combustion were used to prepare composite sorbents containing a sorption-active component based on zirconosilicates of framework structure. The synthesis products were characterised by X-ray diffraction analysis, scanning electron microscopy with energy-dispersive X-ray spectroscopy, and their sorption properties for Cs<sup>+</sup>, Pb<sup>2+</sup> and Cd<sup>2+</sup> cations were studied. The zirconosilicate material shows a high distribution coefficient in the process of sorption of Cs<sup>+</sup>, Pb<sup>2+</sup> and Cd<sup>2+</sup> from aqueous solutions (103-105 mL/g). For Pb<sup>2+</sup> as an example, it is shown that as a result of high-temperature phase transformation of the Pb<sup>2+</sup>-form of zirconosilicate, Pb<sup>2+</sup> cations are stabilised in the crystalline phase of lead zirconate PbZrO<sub>3</sub>. The possibility to use spark plasma sintering for obtaining mineral-like ceramics based on zirconosilicate sorbent for immobilisation of radionuclide Cs-137 has been investigated. For ceramics sintered at different temperatures (800-1000 °C) the cesium leaching rate was studied, which is a criterion of hydrolytic stability of radioactive ceramics intended for disposal in rocks. The obtained values of leaching rate (~10<sup>-5</sup>g/(cm<sup>2</sup>•day)) meet the requirements of Federal Norms and Rules in the area of atomic energy use NP-019-2000 “Collection, processing, storage and conditioning of liquid radioactive wastes. Safety requirements”.
Издательство:Сибирское отделение РАН, Институт химии твердого тела и механохимии СО РАН, Институт катализа им. Г.К. Борескова СО РАН, Новосибирский институт органической химии им. Н.Н. Ворожцова СО РАН, Федеральный исследовательский центр угля и углехимии СО РАН, Novosibirsk
Источник:Chemistry for Sustainable Development
Выпуск:Т. 33, № 6
Номера страниц:733-742
Держатель оригинала документа:Far Eastern Federal University, Krasnoyarsk Scientific Centre SB RAS, Institute of Chemistry and Chemical Technology SB RAS, Siberian Federal University
Количество экземпляров:
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