Journal of Applied Sciences1812-56541812-5662Asian Network for Scientific Information10.3923/jas.2010.2905.2910Bouhoun AliM.Badjah Hadj AhmedA.Y.AttouM.EliasA.H.DidiM.A.1220101022The solvent extraction of uranium (VI) from aqueous solutions has been investigated using hexadecylhydroxydiphosphonic acid (HHDPA, H_{4}L^{1}) and dodecylhydroxydiphosphonic acid (DHDPA, H_{4}L^{2}), which were synthesized and characterized by elemental analysis and by FT-IR, ^{1}H NMR, ^{31}P NMR spectroscopy. In this study, we propose a tentative assignment for the shifts of those two ligands and their specific complexes with uranium (VI). A spectroscopic analysis has showed that coordination of uranium (VI) takes place via oxygen atoms. We carried out the extraction of uranium (VI) from aqueous solutions by HHDPA and DHDPA in [carbon tetrachloride + 2-octanol (v/v: 90%/10%)] solutions at an aqueous to organic phase ratio (1/1) and at room temperature. The results showed that the extraction yields are more significant in the case of the HHDPA (92%) which is equipped with a hydrocarbon chain, longer than that of the DHDPA (88%). Logarithmic plots of the uranium (VI) distribution ratio vs. pH_{eq} and the extractant concentration showed that the ratio of extractant to extracted uranium(VI) is 2:1. The metal complexes formed in organic phase are UO_{2}(H_{3}L^{1})_{2}.2H_{2}O and UO_{2}(H_{3}L^{2})_{2}. 2H_{2}O for HHDPA and DHDPA respectively. The equilibrium constants for the extraction of uranium(VI) were found to be 2 and 1.27 for HHDPA and DHDPA, respectively.]]>Basuki, K.T.,1991Black, K.L., J. Koslov and J.D. Moore,1958Blum, H., H.U. Hempel and K.H. Worms,1981Burgada, R., T. Bailly and M. Lecouvey,2003Chiarizia, R., D.R. McAlister and A.W. Herlinger,2001Curtui, M., I. Haiduc and L. Ghizdavu,2001Didi, M.A., A. Elias and D. Villemin,2002Didi, M.A., A. Elias, L. Meddour, M. Attou and A. Azzouz,2004Didi, M.A., M. Kaid and D. Villemin,2008Edwards, C.R. and A.J. Oliver,2000Elias, A., L. Rodehuser, A. Azzouz and M. Attou,1996Girgin, S., N. Acarkan and A.A. Sirkeci,2002Hall, H., J.C. Sullivan, P.G. Rickert and K.L. Nash,2005Horwitz, E.P., R.C. Gatrone and K.L. Nash,1994Jacopin, C., M. Sawicki, G. Plancque, D. Doizi and F. Taran et al.,2003Kabachnik, M.I., T.Y. Medved, N.M. Dyaltova and M.V. Rudomino,1974Kadous, A., M.A. Didi and D. Villemin,2009Kahlweit, M., R. Strey and G. Busse,1991Largman, T. and S. Sifniades,1983Lunt, D., P. Boshoff, M. Boylett and Z. El-Ansary,2007Marczenko, Z.,1976Mellah, A. and D. Benachour,2006Reed, W.A., L. Rao, P. Zanonato, A.Y. Garnov, B.A. Powell and K.L. Nash,2007Ritcey, G.M.,2006Singh, H., R. Vijayalakshmi, S.L. Mishra and C.K. Gupta,2001Strey, R. and M. Jonstromer,1992Tunick, A.A., T. Largman and S. Sifniades,1982Urban, V., R. Chiarizia, A.W. Herlinger, C.Y. Ku and P. Thiyagarajan,1998Van Hecke, K. and P. Goethals,2006Sun, Z.M., B.P. Yang, Y.Q. Sun, J.G. Mao and A. Clearfield,2003