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 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.