Role of organic diluents on Am(III) extraction and transport behaviour using N,N,N′,N′-tetraoctyl-3-oxapentanediamide as the extractant

Diluent effect on the solvent extraction and membrane transport properties of Am(III) using TODGA (N,N,N′,N′-tetraoctyl-3-oxapentanediamide) as extractant/carrier have been investigated in detail. The diluents studied were n-dodecane, 1-octanol, tert-butyl benzene, kerosene, toluene, carbon tetra chloride, chloroform, 1,2-dichloroethane, and nitrobenzene. The distribution ratio values of Am(III) with TODGA as the extractant were correlated with various diluent parameters. The nature of the extracted species formed was also determined for the different diluents. Supported liquid membrane (SLM) transport studies were carried out and the ease of Am transport followed the trend: toluene > n-dodecane > kerosene > 1-octanol > tert-butyl benzene ∼ CCl4 > CHCl3. Effect of membrane pore size on Am(III) transport for each of the diluents have been evaluated. Membrane diffusion coefficient values have been calculated using Wilke–Chang equation and compared with those determined experimentally using a tlag method.

► The nature of the diluents played a significant role in Am extraction and transport.
► The nature of the extracted species changed with the diluents.
► Membrane diffusion co-efficient were calculated and determined experimentally.