Тип публикации: статья из журнала

Год издания: 2025

Идентификатор DOI: 10.15372/CSD2025710

Ключевые слова: cenospheres, Zirconosilicates, sorbents, spark plasma sintering, Mineral-Like Ceramics

Аннотация: Hollow aluminosilicate microspheres (cenospheres) of stabilised composition (glass phase - 95.4 wt%; (SiO₂/Al₂O₃)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⁺, Pb²⁺ and Cd²⁺ cations were studied. The zirconosilicate material shows a high distribution coefficient in the process of sorption of Cs⁺, Pb²⁺ and Cd²⁺ from aqueous solutions (103-105 mL/g). For Pb²⁺ as an example, it is shown that as a result of high-temperature phase transformation of the Pb²⁺-form of zirconosilicate, Pb²⁺ cations are stabilised in the crystalline phase of lead zirconate PbZrO₃. 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^-5g/(cm²•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”.

Журнал: Chemistry for Sustainable Development

Выпуск журнала: Т. 33, № 6

Номера страниц: 733-742

ISSN журнала: 18171818

Место издания: Novosibirsk

Издатель: 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

• Kutikhina E. A. (Krasnoyarsk Scientific Centre SB RAS, Institute of Chemistry and Chemical Technology SB RAS)
• Vereshchagina T. A. (Siberian Federal University)
• Belov A. A. (Far Eastern Federal University)
• Shichalin O. O. (Far Eastern Federal University)

• РИНЦ (eLIBRARY.RU)