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在0.1 mol/L NaClO4溶液中研究了Pu(Ⅴ)与H2O2反应的动力学。测定了Pu(Ⅴ)与H2O2的反应速率。探讨了温度以及Fe2+,SO42-,HCO3-,F-等无机离子的存在对反应的影响。实验结果表明,反应对Pu(Ⅴ)与H2O2呈一级,对溶液中H+呈-1级;速率方程可表示为:-dc(Pu(Ⅴ))dt=(3.93±1.93)×10-9c(Pu(Ⅴ))c(H2O2)c(H+)。随着温度升高,反应速率明显加快,根据Arrhenius规律,计算出了反应的活化能为Ea=84 kJ/mol。地下水中Fe2+,SO42-,HCO3-,F-等离子的存在,有利于Pu(Ⅴ)的还原。
The kinetics of the reaction of Pu (Ⅴ) with H2O2 was studied in 0.1 mol / L NaClO4 solution. The reaction rate of Pu (Ⅴ) with H2O2 was measured. The effects of temperature and the existence of inorganic ions such as Fe2 +, SO42-, HCO3- and F- on the reaction were discussed. The experimental results show that the reaction is first order for Pu (Ⅴ) and H2O2, and for H + in the solution is -1 order. The rate equation can be expressed as: -dc (Pu (Ⅴ)) dt = (3.93 ± 1.93) × 10-9c (Pu (V)) c (H2O2) c (H +). With the increase of temperature, the reaction rate is obviously accelerated. According to the Arrhenius law, the activation energy of the reaction is calculated as Ea = 84 kJ / mol. The existence of Fe2 +, SO42-, HCO3- and F- in groundwater is beneficial to the reduction of Pu (Ⅴ).