Abstract
Uranium(VI) is stripped from 0.1 mol.l -1 DEHPA/dodecane using different concentration of phosphoric acid. This study investigates the main operating variables, mainly phosphoric acid concentration used as a strip solution, and temperature. Infrared spectra of the stripped organic were investigated in region of P=O stretching vibration to represent the effect of the previous variables on uranium stripping and compared with other conventional analytical methods. Results showed that concentration of the strip solution is effective in the range of 5-18 wt% P 2 O 5 at fixed temperature, and the temperature effect is less than the strip solution concentration effect by the factor of 1/6. Results obtained enable us to choose the suitable temperature and wt% P 2 O 5 of the strip solution to evaluate the demanded stripping distribution ratio.
Highlights
Surfactants are profitably used in the extraction technology of metal ions from aqueous solutions
Uranium stripping from the organic phase solution of 0.1 mol.l−1 DEHPA/dodecane containing 1995 mg/l uranium was carried out using aqueous solutions of 5%wt, 15%wt and 25%wt P2O5, under the above mentioned conditions
The effect of wt% P2O5 of the strip solution on uranium stripping distribution ratio Ds at different temperatures is represented in Fig. 2, where, uranium stripping distribution ratio represents the ratio of uranium concentration in the aqueous phase/ uranium concentration in organic phase
Summary
Surfactants are profitably used in the extraction technology of metal ions from aqueous solutions. At a relatively high concentration of DEHPA extractant, the molecules undergo a self-association process. It takes place through a dipole-dipole interaction. (Dahdouh et al [7]) This present work, investigates the intensity variation of P=O group in association with UO22+ion stretching band (P-O-U) in DEHPA/dodecane, during uranium stripping, using phosphoric acid as a stripping agent and evaluate the optimum temperature and wt % P2O5 of the phosphoric acid in order to achieve the Analysis of factors affecting uranium stripping. The infrared spectra of the separated and stripped organic phase have been recorded to determine the intensity of P-O-U stretching band. The cell path length of KBr windows of the sample and the reference were 0.55mm
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