Библиографическое описание:Hydrothermal Synthesis of Cesium and Strontium Bearing Mineral-Like Phases Using Coal Fly Ash Cenospheres : научное издание / T. A. VERESHCHAGINA [et al.]. - Текст : непосредственный // Chemistry for Sustainable Development. - 2021. - Т. 29, № 3. - P. 269-279. - Cited Reference Count: 25. - The work was carried out with support from the RFBR under Project No. 19-03-00448 and within the State Assignment for the Institute of Chemistry and Chemical Technology SB RAS (Project No. 0287-20210013) using the equipment of the Shared Equipment Centre for carrying out analyses by means of SEMEDS and ASS. Authors thank researchers from the ICCT SB RAS (Krasnoyarsk) G. N. Bondarenko for recording and interpreting X-ray diffraction patterns, A. M. Zhizhaev for carrying out SEM-EDS analyses of the polished sections of samples, L. A. Solovyov for X-ray structural analysis., RFBRRussian Foundation for Basic Research (RFBR). 19-03-00448. - ISSN 1817-1818, DOI 10.15372/CSD2021305.
Аннотация:The possibility of hydrothermal synthesis of Cs and Sr bearing framework aluminosilicates in the CsNO<sub>3</sub>-NaOH-H<sub>2</sub>O-(SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>)<sub>glass</sub> and Sr(NO<sub>3</sub>)<sub>2</sub>-NaOH-H<sub>2</sub>O-(SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>)<sub>glass</sub> systems using coal fly ash cenospheres was studied as a low-temperature method to include the water-soluble forms of radionuclides <sup>137</sup>Cs и <sup>90</sup>Sr in a mineral-like form. The syntheses were carried out at temperatures in the range of 80-200 °С and autogenous pressure. Narrow fractions of cenospheres with the glass phase content of 90-95 mass % were used as aluminosilicate glass, and compounds of stable isotopes of Cs and Sr were used as imitators of radionuclides <sup>137</sup>Cs и <sup>90</sup>Sr. Based on the data obtained in the studies of solid products and post-synthetic solutions by means of X-ray diffraction (XRD), scanning electron microscopy with energy-dispersive X-ray microanalysis (SEM-EDX) and atomic absorption spectroscopy (AAS), it was established that the Cs bearing analcime-pollucite solid solutions (Na <sub>n</sub> Cs<sub>1 - n </sub>)AlSi<sub>2</sub>O<sub>6</sub>• n H<sub>2</sub>O are crystallized in the Cs-containing system at 120-150 °C with 98 % Cs<sup>+</sup> removal from solution to the solid product. The Sr bearing phases of tobermorite and plagioclase structural types are formed in the Sr(NO<sub>3</sub>)<sub>2</sub>-NaOH-H<sub>2</sub>O-(SiO<sub>2</sub>-Al<sub>2</sub>O<sub>3</sub>)<sub>glass</sub> system. In this case, the effectiveness of Sr<sup>2+</sup> extraction from solution is not less than 99.99 %.
Издательство:Федеральный исследовательский центр угля и углехимии СО РАН, Институт химии твердого тела и механохимии СО РАН, Институт катализа им. Г.К. Борескова СО РАН, Сибирское отделение РАН, Новосибирский институт органической химии им. Н.Н. Ворожцова СО РАН, Novosibirsk
Источник:Chemistry for Sustainable Development
Выпуск:Т. 29, № 3
Номера страниц:269-279
Держатель оригинала документа:Department of Chemistry, Siberian Federal University, Institute of Chemistry and Chemical Technology SB RAS FRC “Krasnoyarsk Science Center SB RAS”
Количество экземпляров:
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