Extraction Kinetics Behavior of Am(Ⅲ) by TODGA

ZHU Wen-bin; YE Guo-an; LI Feng-feng; LI Hui-rong

doi:10.7538/hhxyfshx.2013.35.03.0136

Journal of Nuclear and Radiochemistry > 2013 > 35(3): 136-143. > DOI: 10.7538/hhxyfshx.2013.35.03.0136

ZHU Wen-bin, YE Guo-an, LI Feng-feng, LI Hui-rong. Extraction Kinetics Behavior of Am(Ⅲ) by TODGA[J]. Journal of Nuclear and Radiochemistry, 2013, 35(3): 136-143. DOI: 10.7538/hhxyfshx.2013.35.03.0136

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Extraction Kinetics Behavior of Am(Ⅲ) by TODGA

China Institute of Atomic Energy, P. O. Box 275(26), Beijing 102413, China

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Abstract

In the present paper, N, N, N′, N′-tetraoctyl diglycolamide(TODGA) as the extractant and n-dodecane as the diluent, the extraction kinetics behavior of Am(Ⅲ) in TODGA/n-dodecane HNO₃ system was studied, including stirring speed, the interfacial area, extractant concentration in n-dodecane, extracted ions concentration, acidity of aqueous phase and temperature. The results show that the extraction process is controlled by diffusion under 130 r/min of stirring speed and by chemical reaction above 150 r/min. The extraction rate equation and the apparent extraction rate constant of Am(Ⅲ) by TODGA/ n-dodecane in (170±2) r/min and (25±0.1)℃ are as follows:
r₀=(dc_org(M)/dt)_t=0=k•(S/V)c^0.94_aq,0(Am)c^1.05_aq,0(HNO₃)c^1.19_org,0(TODGA)
k=(24.2±3.4)×10^-3mol^-2.18•L^2.18•min^-1•cm，E_a=(25.94±0.98)kJ/mol.
- TODGA,
- Am(Ⅲ),
- extraction kinetics

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