Selective Extraction of Am(III) from PUREX Raffinate: The AmSel System

Do An(iii) and Ln(iii) ions form heteroleptic complexes with diglycolamide and hydrophilic BT(B)P ligands in solvent extraction systems? A spectroscopic and DFT study

“…Slope analysis of extraction experiments yields too low values for the SO 3 -Ph-BTBP/TODGA system as well. 18 Thus, the formation of heteroleptic complexes with SO 3 -Ph-BTBP and TEDGA in aqueous solution was also investigated. Fig.…”

“…The expected formation of Cm(III) 1 : 2 complexes with these ligands was confirmed by spectroscopic studies in aqueous solutions. 17,21 However, slope analysis of liquid-liquid extraction experiments in the systems SO 3 -Ph-BTBP/TODGA and SO 3 -Ph-BTPhen/TODGA yielded values of approximately À1.3 and À0.8, respectively, 18,21 which implies the formation of only 1 : 1 complexes of An(III) with these tetra-N-dentate ligands.…”

“…These complexing agents retain the BT(B)P selectivity for An(III)over-Ln(III) complexation in the aqueous phase, offering new possibilities for the development of separation processes. [14][15][16][17][18][19][20][21] The combination of co-extraction of An(III) and Ln(III) from the PUREX raffinate by using a lipophilic diglycolamide ligand TODGA (N,N,N 0 ,N 0 -tetra-n-octyl-diglycolamide, Scheme 2), followed by selective stripping of An(III) using a hydrophilic BTP, 2,6-bis(5,6di(3-sulphophenyl)-1,2,4-triazin-3-yl)pyridine, (SO 3 -Ph-BTP 4À , Scheme 1 top) dissolved in the aqueous phase, results in large separation factors of An(III) over Ln (III), which is the basis of various separation processes. [22][23][24][25][26] However, the experimental results related to the complexation of An(III) with these anionic N-donor ligands in the aqueous phase were rather difficult to interpret.…”

Continuous Liquid-Liquid Extraction of Uranium from Uranium-containing Wastewater Using an Organic Phase-refining-type Emulsion Flow Extractor

“…Liquid-liquid extraction is an effective method for several processes related to the nuclear fuel cycle, which involves the process of milling uranium from uranium mines, [1][2][3][4] the reprocessing of spent fuel, [5][6][7][8] or the partitioning for high-level liquid waste. [9][10][11][12] Such extraction has recently also received attention in industrial fields as a method for the recovery and recycling of minor metals from industrial waste. [13][14][15][16] As an alternative to the existing continuous liquid-liquid extraction apparatus to recover valuable substances or to remove hazardous materials from wastewaters, such as mixer-settler, centrifugal extractor, or spray extraction column, we have developed a new continuous liquid-liquid extraction method using an emulsion flow (EF) extractor.…”

Solvent Extraction and Fluorescence Spectroscopic Investigation of the Selective Am(III) Complexation with TS-BTPhen

“…[19] =200. [16,[20][21] The TODGA-TS-BTPhen based concept investigated in this work is a less complex alternative approach to the EXAm process and provides higher separation factors for Cm(III) over Am(III) compared to the AmSel process. Cm (5805 keV) using an Ortec Octête-pc eight chamber alpha measurement system equipped with PIPS detectors.…”