核化学与放射化学2013，Vol.35Issue(4)：228-234,7.DOI:10.7538/hhx.2013.35.04.0228
TODGA/正十二烷萃取Sr(Ⅱ)的动力学
Kinetics and Mechanism of Sr(Ⅱ) Extraction With TODGA
朱文彬 1叶国安 1李峰峰 1李会蓉1
作者信息
- 1. 中国原子能科学研究院 放射化学研究所,北京102413
- 折叠
摘要
Abstract
In the present paper,N,N,N',N'-tetraoctyl diglycolamide (TODGA) as the extractant and n-dodecane as the diluent,the extraction kinetics behaviors of Sr (Ⅱ) in TODGA/n-dodecane-HNO3 system were studied,including stirring speed,specific interface,extractant concentration in n-dodecane,Sr2+ concentration of aqueous phase,HNO3 concentration of aqueous phase and temperature.The results show that the extraction process is controlled by diffusion mode under 130 r/min of stirring speed and by chemical reaction mode above 150 r/min.The extraction rate equation and the apparent extraction rate constant of Sr(Ⅱ) by TODGA/n-dodecane in (170±2) r/min and (25±0.1) ℃ are as follows:r0=dcorg(M)/dt|t=0=k ·S/Vc0.91aq,0(Sr)c0.73aq,0(HNO3)c0.87org,0(TODGA)k=(22.5±2.5) ×10-3 mol-1.51 · L1.51 · min-1 · cm;Ea(Sr(Ⅱ))=(24.3±0.7) kJ/mol.关键词
TODGA/Sr(Ⅱ)/萃取动力学Key words
TODGA/ Sr(Ⅱ)/extraction kinetics分类
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朱文彬,叶国安,李峰峰,李会蓉..TODGA/正十二烷萃取Sr(Ⅱ)的动力学[J].核化学与放射化学,2013,35(4):228-234,7.
