盐酸介质中二价铁还原高锝酸盐的动力学研究  

REDUCTION KINETICS OF PERTECHNETATE BY FERROUS ION IN HYDROCHLORIC ACID MEDIUM

作　　者：贾永芬[1] 朱志瑄[1] 张丕禄[1] 王方定[1] 傅依备[2] 

机构地区：[1]中国原子能科学研究院放射化学研究所 [2]中国工程物理研究院核物理与化学研究所

出　　处：《原子能科学技术》1998年第S1期130-135,共6页Atomic Energy Science and Technology

基　　金：中国工程物理研究院基金

摘　　要：研究了ＨＣｌ介质中Ｆｅ２＋还原高锝酸盐的动力学。考察了高锝酸盐浓度、Ｆｅ２＋浓度、Ｈ＋浓度、温度对反应速率的影响，得到２５℃时的反应速率方程为：－ｄｃ（ＴｃＯ４－）／ｄｔ＝（９．２±０．６）×１０－４ｃ（ＴｃＯ４－）ｃ（Ｈ＋）５．４ｃ（Ｆｅ２＋）０．９３（速率常数单位为ｍｏｌ－６．３·Ｌ６．３·ｓ－１）；反应活化能为６３ｋＪ。对反应可能的机理进行了探讨。The reduction kinetics of pertechnetate by ferrous ion in hydrochloric acid medium is studied. The effects of the concentration of pertechnetate,ferrous and hydrogen ion on the reaction rate is investigated. The reaction rate expression at 25 ℃ is obtained as: -d c (TcO 4 -)/d t = (9.2±0.6) ×10 -4 · c (TcO 4 -)· c (H +) 5.4 · c (Fe 2+ ) 0.93 , and the unit of reaction rate constant is mol -6.3 ·L 6.3 ·s -1 . The effect of temperature on the reaction rate is studied. The activated energy of the reaction is about 63 kJ. The possible mechanism is discussed.

关 键 词：Fe²⁺ 高锝酸盐 还原动力学 

分 类 号：O643.1[理学—物理化学] O611.3[理学—化学]