铀(Ⅵ)在氯化1-丁基-3-甲基咪唑中的电化学性质

Electrochemical Behavior of Uranium(Ⅵ) in 1-Butyl-3-Methylimidazolium Chloride

摘要: 通过循环伏安和计时电位等电化学测量方法研究了硝酸铀酰在亲水性离子液体——氯化1-丁基-3-甲基咪唑(［BMIM］Cl)中的电化学过程。结果表明，UO₂²⁺在离子液体［BMIM］Cl中转移2个电子，一步还原为UO₂。当扫描速率为10～100 mV/s、体系温度为353K、UO₂²⁺浓度为13.27 mmol/L时，电极反应UO₂²⁺+2eFY(KNFY)UO₂为可逆反应。增大扫描速率，此电极反应转变为不可逆。测得UO₂²⁺在［BMIM］Cl中的扩散系数D和活化能E_a分别为9.01×10^-8cm² /s(353K)和54.6 kJ/mol。采用恒电流150 μA电解18 h，在不锈钢电极上沉积得到了铀。

Abstract: The electrochemical behavior of uranylnitrate in 1-butyl-3-methylimidazolium chloride (［BMIM］Cl) has been investigated by cyclicvoltammetry and chronopotentiometry. Reduction of UO₂²⁺ in ［BMIM］Cl takes place through a single step two-electron transfer to UO₂, which is reversible reaction at the potential sweep range of 10-100 mV/s. Diffusion coefficient and the energy of activation of UO₂²⁺ is 9.01×10^-8cm²/s at 353 K and 54.6 kJ/mol, respectively. Controlled current electrolysis of a solution of uranyl nitrate in ［BMIM］Cl is carried out on a stainless steel plate at 150 μA for 18 h. Uranium is successfully deposited all over the surface of a stainless steel plate.