Filipowicz Barbara, Pruszyński Marek, Krajewski Seweryn, Bilewicz Aleksander
Centre of Radiochemistry and Nuclear Chemistry, Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland.
J Radioanal Nucl Chem. 2014;301(3):889-895. doi: 10.1007/s10967-014-3228-5. Epub 2014 Jun 22.
Various types of sodium and potassium titanate nanostructures (nanotubes, nanofibers, nanoribbons, nanwires) were synthesized and characterized by X-ray diffraction, SEM and TEM, as well BET and BJH methods. Adsorption of radiotracer Cs ions from aqueous solutions on synthesized titanate nanostructures was investigated in batch technique as a function of contact time, concentration of sodium ions and pH of the solutions. It was found that among the studied nanostructures nanotubes shows the highest selectivity for Cs, which is related to a zeolitic character of Cs adsorption. The efficient adsorption of Cs was obtained in Na solutions with concentration below 10 M, at pH 7-9 and in contact time above 2 h. Moreover, nanotubes have the higher specific surface area than other nanostructures, which results in better availability of ion exchange groups and high ion exchange capacity. These properties of nanotubes indicate that they may be used for adsorption of Cs from various types of nuclear wastes.
合成了各种类型的钛酸钠纳米结构（纳米管、纳米纤维、纳米带、纳米线），并通过X射线衍射、扫描电子显微镜和透射电子显微镜以及BET和BJH方法对其进行了表征。采用分批技术研究了放射性示踪剂铯离子在合成的钛酸盐纳米结构上从水溶液中的吸附情况，该吸附情况是接触时间、钠离子浓度和溶液pH值的函数。研究发现，在所研究的纳米结构中，纳米管对铯的选择性最高，这与铯吸附的沸石特性有关。在浓度低于10 M的钠溶液中，pH值为7 - 9且接触时间超过2小时的情况下，可实现铯的高效吸附。此外，纳米管比其他纳米结构具有更高的比表面积，这导致离子交换基团的可用性更好且离子交换容量高。纳米管的这些特性表明它们可用于从各种类型的核废料中吸附铯。
