超重元素Sg的液相化学条件实验——Mo和W的萃取色谱行为

范芳丽; 秦芝; 白静; 吴晓蕾; 范富有; 王洋; 田伟; 赵梁; 郭俊盛

超重元素Sg的液相化学条件实验——Mo和W的萃取色谱行为

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

摘要

摘要: 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。

Abstract: 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 1mol/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.

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