A first phosphine oxide-based extractant with high Am/Cm selectivity

Abstract

A new phosphine oxide ligand demonstrates high selectivity for the Am–Cm pair with SF = 2.9–3.5 and the Am–Eu pair with SF = 7.3–8.5 in the range of 0.1–3 M nitric acid.

Effect of Counteranions on the Extraction and Complexation of Trivalent Lanthanides with Tetradentate Phenanthroline-Derived Phosphonate Ligands

“…BLPhen (Figure ) was also designed to improve the separation of Am­(III) over Eu­(III) by further rigidly fixing the amide side chain. Alternatively, the Borisova group and we , have reported types of new phenanthroline-derived phosphonate ligands, C2-POPhen and C4-POPhen (Figure ), by incorporating the diethyl or dibutyl phosphonate groups in the 2 and 9 positions of phenanthroline. These types of ligands combined the advantages of both tributyl phosphate, , which has been widely applied in the recovery of actinides from the spent fuel, and the rigid 1,10-phenanthroline core for the highly efficient separation of trivalent actinides over lanthanides from spent nuclear fuel.…”

Probing a variation of the inverse-trans-influence in americium and lanthanide tribromide tris(tricyclohexylphosphine oxide) complexes

“…Phosphine oxide ligands have recently demonstrated relatively high selectivity for the Am-Cm pair in the form of (Ph 2 PyPO) 2 M(NO 3 ) 3 . 29 Although phosphine oxides are heavily utilized in separation of f-elements relevant to the nuclear fuel cycle, there have been few crystallographic studies for trans-uranium elements, and indeed only the mono and bis [Opy-2,6-CH 2 (Ph) 2 PO], NOPOPO, adducts have been reported. 30 Herein we examine the synthesis and structure in saturated tricyclohexylphosphine oxide adducts of f-element tribromides, and the effects of the ITI on trivalent f-elements.…”

Macrocyclic Pyridone Pentamers for Highly Selective High‐Capacity Removal of Caesium Ions from Radioactive High‐Salinity Waste

“…Growing concerns of environmental protection have made efficient separation of radioactive elements a topical research field in recent years [1–22] . 137 Cs is one of the deadliest radioactive wastes and a documented nuclear fallout during the recycling of spent nuclear fuel (SNF), with a reasonably long radioactive half‐life ( t 1/2 =30.1 years) and a high decay energy of 1176 keV.…”