Livitska Oksana, Strutynska Nataliia, Loza Kateryna, Prymak Oleg, Prylutskyy Yuriy, Livitska Olha, Epple Matthias, Slobodyanik Nikolai
Taras Shevchenko National University of Kyiv, Volodymyrska Str. 64, Kiev, 01601, Ukraine.
University of Duisburg-Essen, Inorganic Chemistry and Center for Nanointegration Duisburg-Essen (CeNIDE), Universitaetsstr. 5-7, 45117, Essen, Germany.
Chem Cent J. 2018 Jul 24;12(1):87. doi: 10.1186/s13065-018-0455-9.
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/PO (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) 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-Ca(PO) 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.
利用从水溶液中的吸附过程以及进一步加热至700°C，研究了铯掺入具有磷灰石或白磷钙矿型结构的合成磷酸钙中的特殊性。用于吸附的纳米颗粒通过在固定的Ca/P摩尔比为1.67以及两种不同的CO/PO比（0或1）的情况下从水溶液中进行湿沉淀来制备。通过粉末X射线衍射、傅里叶变换红外光谱、扫描电子显微镜和元素分析对从不同摩尔浓度（c(Cs)=0.05、0.1和0.25 mol/L）的溶液中吸附铯后获得的取代磷酸钙和相应样品进行了表征。基于吸附后粉末的X射线衍射和元素分析数据的结合，掺入磷灰石或白磷钙矿型结构中的铯及其含量随其在初始溶液中的浓度增加而增加。对于含钠磷酸钙，即使其组成中含有少量的铯，也会显著改变其在700°C退火下转变的一般原理，形成α-Ca(PO)和含铯磷灰石相关相的混合物。所得结果表明了使用复合取代磷酸钙纳米颗粒将铯固定在稳定的白磷钙矿或磷灰石型晶体材料中的前景。
