H2O2对Pu(Ⅴ)的还原动力学研究
Kinetic Study of Reduction of Pu(Ⅴ) With H2O2
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摘要: 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+，SO2-4，HCO-3，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+，SO2-4，HCO-3，F-等离子的存在，有利于Pu(Ⅴ)的还原。
Abstract: Reaction kinetics of PuO+2 with hydrogen peroxide in 0.1 mol/L NaClO4 solution is studied. Results of the kinetics of the reduction of PuO+2 with hydrogen peroxide indicate that the reduction of PuO+2 is first order with respect to hydrogen peroxide concentration and inverse first order with respect to hydrogen ion concentration. With these results and assuming a first order dependence with respect to the concentration of PuO+2 the reduction rate of PuO+2 increases with the increase of temperature. The velocity equation is as follow. The activation energy is deduced to be about 84 kJ/mol. The existence of Fe2+，F- ，HCO-3 and SO2-4 accelerate the reduction of Pu(Ⅴ) obviously. The reduction of PuO+2 with hydrogen peroxide in BS03 well underground water is studied. The reduction rate is obviously faster than that without hydrogen peroxide in the same underground water.
-dc(Pu(Ⅴ))/dt=(3.93±1.93)×10-9c(Pu(Ⅴ))c(H2O2)/c(H+)
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