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特丁基肼（TBH）是一种新型无盐还原剂,能有效还原Np（Ⅵ）,而对Pu（Ⅳ）的还原则缓慢。在所有的肼类衍生物中,TBH对Np（Ⅵ）、Pu（Ⅳ）的还原速率差别最大,有望实现Np、Pu有效分离。 本工作利用分光光度法研究了硝酸体系中特丁基肼还原Np（Ⅵ）的动力学。研究了特丁基肼浓度、硝酸浓度、温度对还原速率的影响。实验结果表明,该反应的速率方程可表示为: -dc（Np（Ⅵ））/dt=kc（Np（Ⅵ））c（TBH）0.9c（H+）-0.75 25℃时,反应速率常数k=5.44（mol/L）-0.15·min-1,反应活化能为61.26kJ/mol。 探讨了离子强度、UO22+浓度、Fe3+浓度对还原速率的影响。结果表明:改变离子强度和
TBH is a novel salt-free reducing agent that can effectively reduce Np (Ⅵ) while reducing Pu (Ⅳ) slowly. Among all the hydrazine derivatives, the difference of the reduction rates of Np (Ⅵ) and Pu (Ⅳ) by TBH is the largest, and it is expected that Np and Pu will be effectively separated. In this work, the kinetics of Np (Ⅵ) reduction by t-butyl hydrazine in nitric acid system was studied by spectrophotometry. The effects of t-butyl hydrazine concentration, nitric acid concentration and temperature on the reduction rate were studied. The experimental results show that the rate equation of the reaction can be expressed as: -dc (Np (Ⅵ)) / dt = kc (Np (Ⅵ)) c (TBH) 0.9c = 5.44 (mol / L) -0.15 min-1, the reaction activation energy of 61.26kJ / mol. The effects of ionic strength, UO22 + concentration and Fe3 + concentration on the reduction rate were discussed. The results show that: changing the ionic strength and