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Hydrothermal synthesis and sorption performance to Cs(I) and Sr(II) of zirconia-analcime composites derived from coal fly ash cenospheres

Описание

Тип публикации: статья из журнала

Год издания: 2022

Идентификатор DOI: 10.15826/chimtech.2022.9.4.18

Ключевые слова: cenospheres, cs(i) and sr(ii) sorption, hydrothermal synthesis, radioactive waste, zirconia-analcime composite

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 zirconia-analcime 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. © 2022, the Authors.

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Издание

Журнал: Chimica Techno Acta

Выпуск журнала: Vol. 9, Is. 4

Номера страниц: 20229418

ISSN журнала: 24095613

Издатель: Ural Federal University

Персоны

  • Vereshchagina T.A. (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation)
  • Kutikhina E.A. (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation)
  • Buyko O.V. (Research Department, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation)
  • Anshits A.G. (Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center of Siberian Branch of the Russian Academy of Sciences”, Krasnoyarsk, 660036, Russian Federation, Department of Chemistry, Siberian Federal University, Krasnoyarsk, 660041, Russian Federation)

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