Radiochemical Extraction of Lanthanide Thiocyanate Complexes with Bis-2-Ethylhexyl Sulphoxide

Abstract

The extraction of lanthanides (Ln) such as Nd(III), Eu(III) and Er(III) from thiocyanate solutions by bis-2-ethylhexyl sulphoxide (B2EHSO) in benzene has been studied by tracer techniques. For comparison, extraction studies have been carried out with di-n-octyl sulphoxide (DOSO) and tri-octyl phosphine oxide (TOPO). Extraction studies have also been carried out with mixtures of B2EHSO and DOSO or TOPO. A relatively small synergistic enhancement has been observed with a mixture of extractants, which may be due to the formation of more stable mixedligand complexes. The extraction data have been analysed by both graphical and theoretical methods taking into account aqueous phase speciation and all plausible complexes extracted into the organic phase. The equilibrium constants of the extracted species were determined by non-linear regression analysis.

Liquid–liquid extraction of Hg(II) from acidic chloride solutions using bis‐2‐ethylhexyl sulfoxide

“…Their other advantages include good thermal stability, low toxicity (good coordination ability) and relatively cheap supply. Among the dialkyl sulfoxides, bis-2-ethylhexyl sulfoxide (B2EHSO), a novel sterically hindered branched chain neutral extractant, has been studied for the extraction of lanthanides(III), 13 uranium(VI) 14 and palladium(II). 15 B2EHSO offers distinct advantages over other analogues with unrestricted solubility in an alkane diluent.…”

Synergistic Extraction of Trivalent Lanthanoids with 3-Phenyl-4-benzoyl-5-isoxazolone and Various Sulphoxides

“…•Ä^HTTA (equilibrium constant with thenoyltrifluoroacetone) values for the trivalent lanthanoids [12,13].…”

“…Comparing the equilibrium constants of various chelating agents for the extraction of Nd(III), log/:HrrA = -7.59 [12], log/sTHPMTFP = -3.97 [13] and logATHPBi = -3. The mechanism of synergistic extraction of these trivalent lanthanoids was further confirmed by analyzing the equilibrium data (Figs.…”

Synergistic Solvent Extraction of Trivalent Lanthanides and Actinides by Mixtures of l-Phenyl-3-methyl-4-acetyl-pyrazolone-5 and Neutral Oxo-Donors

“…1 -Phenyl-3-methyl-4-acetyl-pyrazolone-5 (HPMAP), pKa = 3.78, though a promising chelate extractant for actinides [10] has not been investigated for its potential synergism in the extraction of trivalent lanthanides and actinides. Further, synergistic solvent extraction studies using sulphoxides and octyl(phenyl)-N,Ndiisobutylcarbomylmethyl phosphine oxide (CMPO) as neutral donors in the presence of /J-di ketones are sparse [4,11]. Pruett et al [4] have studied the synergistic extraction of Eu(III) and Am(III) with ΗΤΤΑ in the presence of CMPO as a neutral donor.…”

“…Pruett et al [4] have studied the synergistic extraction of Eu(III) and Am(III) with ΗΤΤΑ in the presence of CMPO as a neutral donor. Bis(2-ethylhexyl)sulphoxide (B2EHSO), a novel sterically hindered branched chain extractant, has been recently explored as a neutral donor for the synergistic solvent extraction of trivalent lanthanides in the presence of ΗΤΤΑ in our laboratory [11],…”