摘要
研究了甲醛肟(FO)与Pu(Ⅳ)的还原反应动力学,其动力学方程式为-dc(Pu(Ⅳ))/dt=kc(Pu(Ⅳ))c1.61(FO)c-0.88(H+),在18.7℃时,反应速率常数k=(110.39±7.70)(mol/L)-0.73/s,活化能为(68.82±3.00)kJ/mol。研究了甲醛肟浓度、H+浓度、硝酸根浓度、Fe3+浓度、UO22+浓度以及温度对甲醛肟与Pu(Ⅳ)还原反应速率的影响。结果表明:增加甲醛肟浓度、降低UO22+和H+浓度、增加Fe3+浓度以及升高温度,均使Pu(Ⅳ)还原速度增加;硝酸根浓度对甲醛肟还原Pu(Ⅳ)的速率基本无影响。
The kinetics of reaction between Pu(Ⅳ) and formoxime (FO) in nitric acid solution was determined. The rate equation is found to be -dc(Pu(IV))/dt-kc(Pu(Ⅳ))c1.61(FO)c-0.88(H+),at 18.7℃ The activation energy is found to be Ea = (68.82±3.00) kJ/mol. Effects of c(FO), c(H+), c(Fe3+), c(UO22+), c(NO3-) and temperature on reduction rate of Pu(Ⅳ) were investigated. Pu(Ⅳ) can be rapidly reduced to Pu(Ⅲ ) by FO under normal conditions. The reaction rate can be accelerated by increasing concentration of formoxime, decrea- sing concentration of UO2+ and H+ , increasing concentration of Fe3+ and rising temperature. The influence of NOf on reaction rate is negligible.
出处
《原子能科学技术》
EI
CAS
CSCD
北大核心
2010年第2期166-170,共5页
Atomic Energy Science and Technology
基金
中国核工业集团公司预先研究基金项目(61601090401)
作者简介
作者简介:肖松涛(1975-),男,北京人,工程师,乏燃料后处理专业