{"title":"Immobilization of cesium from aqueous solution using nanoparticles of synthetic calcium phosphates.","authors":"Oksana Livitska, Nataliia Strutynska, Kateryna Loza, Oleg Prymak, Yuriy Prylutskyy, Olha Livitska, Matthias Epple, Nikolai Slobodyanik","doi":"10.1186/s13065-018-0455-9","DOIUrl":null,"url":null,"abstract":"<p><p>The particularities of cesium incorporation into synthetic calcium phosphates with either apatite or whitlockite-type structures were investigated using the sorption process from aqueous solution and further heating to 700 °C. The nanoparticles for sorption were prepared by wet precipitation from aqueous solutions at a fixed molar ratio of Ca/P = 1.67 and two different ratios of CO<sub>3</sub><sup>2-</sup>/PO<sub>4</sub><sup>3-</sup> (0 or 1). The obtained substituted calcium phosphates and corresponding samples after the sorption of cesium from solutions with different molar concentrations (c(Cs<sup>+</sup>) = 0.05, 0.1 and 0.25 mol L<sup>-1</sup>) were characterized by powder X-ray diffraction, FTIR spectroscopy, scanning electron microscopy and elemental analysis. Based on the combination of X-ray diffraction and elemental analyses data for the powders after sorption, the cesium incorporated in the apatite- or whitlockite-type structures and its amount increased with its concentration in the initial solution. For sodium-containing calcium phosphate even minor content of Cs<sup>+</sup> in its composition significantly changed the general principle of its transformation under annealing at 700 °C with the formation of a mixture of α-Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> and cesium-containing apatite-related phase. The obtained results indicate the perspective of using of complex substituted calcium phosphates nanoparticles for immobilization of cesium in the stable whitlockite- or apatite-type crystal materials.</p>","PeriodicalId":9842,"journal":{"name":"Chemistry Central Journal","volume":null,"pages":null},"PeriodicalIF":0.0000,"publicationDate":"2018-07-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.1186/s13065-018-0455-9","citationCount":"3","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Chemistry Central Journal","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.1186/s13065-018-0455-9","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"Chemistry","Score":null,"Total":0}
引用次数: 3
Abstract
The particularities of cesium incorporation into synthetic calcium phosphates with either apatite or whitlockite-type structures were investigated using the sorption process from aqueous solution and further heating to 700 °C. The nanoparticles for sorption were prepared by wet precipitation from aqueous solutions at a fixed molar ratio of Ca/P = 1.67 and two different ratios of CO32-/PO43- (0 or 1). The obtained substituted calcium phosphates and corresponding samples after the sorption of cesium from solutions with different molar concentrations (c(Cs+) = 0.05, 0.1 and 0.25 mol L-1) were characterized by powder X-ray diffraction, FTIR spectroscopy, scanning electron microscopy and elemental analysis. Based on the combination of X-ray diffraction and elemental analyses data for the powders after sorption, the cesium incorporated in the apatite- or whitlockite-type structures and its amount increased with its concentration in the initial solution. For sodium-containing calcium phosphate even minor content of Cs+ in its composition significantly changed the general principle of its transformation under annealing at 700 °C with the formation of a mixture of α-Ca3(PO4)2 and cesium-containing apatite-related phase. The obtained results indicate the perspective of using of complex substituted calcium phosphates nanoparticles for immobilization of cesium in the stable whitlockite- or apatite-type crystal materials.
期刊介绍:
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