超重元素Sg的液相化学条件实验——Mo和W的萃取色谱行为

通过对超重元素Sg的同族元素Mo和W在负载有萃取剂α-安息香肟的聚四氟乙烯载体上进行吸附实验,为利用萃取色谱法在线研究超重元素Sg的液相化学行为提供基础。实验结果发现,在一定的酸度条件下,Mo和W的最大吸附率可分别达到92%和87%,且Mo的吸附动力学较W快。在混合酸体系HF/HNO3中,由于Mo和W与阴离子F-形成化合物的能力不同,导致它们的吸附行为有明显的差别,这为比较超重元素Sg的化学行为提供了很好的条件。同时,温度对Mo和W的吸附分配系数有一定的影响,随着温度的升高,它们的吸附效率都有所减小,但Mo和W在负载有萃取剂α-安息香肟的聚四氟乙烯载体上的吸附行为是自发进行的。

Extraction Chromatography Study of Mo and W for Model Experiment on Aqueous Chemistry of Superheavy Element,Sg

The adsorption behavior of group 6 elements Mo and W on the α-benzoinoxime/PTFE material was investigated in order to develop an experimental approach to aqueous chemical characterization of seaborgium(Sg,element 106).The experimental results show that the maximal adsorption percentage of Mo and W can reach 92% and 87%,respectively.The adsorption kinetics of Mo is faster than W in 1 mol/L HNO3 solution.In HNO3/HF mixed acid solutions,there are significant differences in the behavior of both elements under the higher concentration of HF.This is because W has a stronger tendency for forming anionic species with fluoride ion than Mo.Moreover,the sorption process of Mo and W is exothermic and spontaneous,and their adsorption distribution coefficient is affected by temperature and decreases with the increasing of temperature.