Тип публикации: статья из журнала
Год издания: 2022
Идентификатор DOI: 10.15826/chimtech.2022.9.4.18
Ключевые слова: cenospheres, hydrothermal synthesis, zirconia-analcime composite, Cs(I) and Sr(II) sorption, radioactive waste
Аннотация: The paper is concerned with (i) the hydrothermal synthesis of hydrous zirconium dioxide (HZD) bearing analcime (HZD-ANA, zirconia-analcime) and (ii) its sorption properties with respect to Cs+ and Sr2+. The HZD-ANA particles were synthesized from coal fly ash cenospheres composed of aluminosilicate glass with (SiO2/Al2O3)wt.=3.1 anПоказать полностьюd characterized by PXRD, SEM-EDS, STA, and low-temperature N2 adsorption. The non-radioactive simulant solutions of different acidity (pH = 2-10) and Cs+/Sr2+ content (0.5-50.0 mg/L) were used in the work. The effect of synthesis conditions on the HZD-ANA particle size, zirconia content and localization as well as the sorption behavior with respect to Cs+ and Sr2+ (capacity, KD) were clarified. It was found that the small-sized HZD-ANA composites surpasses the Zr-free analcime and large-sized HZD-ANA material in the Cs+ and Sr2+ sorption parameters (KD ~ 104-106 mL/g). The conditions to synthesize the zirconiaanalcime composite of the highly enhanced sorption ability with respect to Sr2+ (KD ~ 106 mL/g) were determined. The high-temperature solid-phase re-crystallization of Cs+/Sr2+-exchanged HZD-ANA composites was shown to occur at 1000 °C, resulting in a polyphase system based on nepheline, tetragonal ZrO2, and glass phase.
Журнал: Chimica Techno Acta
Выпуск журнала: Т.9, №4
Номера страниц: 20229418
ISSN журнала: 24095613
Место издания: Ekaterinburg
Издатель: Уральский федеральный университет им. первого Президента России Б.Н. Ельцина