Cenosphere-Based Zeolite Precursors of Lutetium Encapsulated Aluminosilicate Microspheres for Application in Brachytherapy.

Coal fly ash hollow aluminosilicate microspheres (cenospheres) of stabilized composition (glass phase-95.4; (SiO/AlO)-3.1; (Si/Al) = 2.

Hydrothermal Co-Processing of Coal Fly Ash Cenospheres and Soluble Sr(II) as Environmentally Sustainable Approach to Sr-90 Immobilization in a Mineral-like Form.

Co-processing of radioactive effluents with coal fly ash-derived materials is recognized as a resource-saving approach for efficient stabilization/solidification of radioactive components of wastewater. In this context, the paper is focused on the hydrothermal synthesis of Sr-bearing aluminosilicate/silicate phases as analogs of a mineral-like Sr waste form using hollow glass-crystalline aluminosilicate microspheres from coal fly ash (cenospheres) as a glassy source of Si and Al (SiO-AlO)) and Sr(NO) solutions as Sr simulant wastewater. The direct conversion of cenosphere glass in the Sr(NO)-NaOH-HO-(SiO-AlO) system as well as Sr sorption on cenosphere-derived analcime (ANA) in the Sr(NO)-HO-ANA system were studied at 150-200 °C and autogenous pressure.