Extraction of neptunium(IV) by a mixture of 3-phenyl-4-acetyl-5-isoxazolone and tri-n-octyl phosphine oxide

Abstract

SummaryThe extraction behaviour of Np(IV) by 3-phenyl-4-acetyl-5-isoxazolone (HPAI) was investigated from nitric acid medium in the presence of tri-

Extraction of Actinides with Different 6,6′‐Bis(5,6‐Dialkyl‐[1,2,4]‐Triazin‐3‐yl)‐[2,2′]‐Bipyridines (BTBPs)

“…MQ water was produced by "Milli-Q gradient" provided by Millipore w . 241 Am, a decay product of 241 Pu, was extracted from an old (about 30 years) solution of Pu in concentrated HNO 3 . The isotopic composition of Pu was approximately 94.4% 239 Pu, 5.5% 240 Pu, and 0.11% 241 Pu.…”

“…These water molecules can be replaced by other ligands if their binding energies are similar or stronger than that of water. NO 3 2 forms complexes with all four metal ions, for which the net charge is a function of the charge of the metal ion and the number of nitrates. If a neutral nitrato complex is formed, this can be extracted to the organic phase without an extracting agent: …”

“…This ligand can be water or a counter-ion. If this position is occupied by NO 3 2 , the neptunyl complex becomes neutral, while the uranyl complex remains positively charged. The structures of these complexes are shown in Fig.…”

“…During the last 25 years, several types of extracting agents have been a focus of scientific discussion. These include for instance DBM (dibenzoylmethane, 1,3-diphenyl-1,3-propanedione), [1] isoxazolone (HPAI), [2] malonamideas and diamides, [3] and others, [4] leading to different mechanisms of extraction. The current group of molecules that aim toward a scale-up process for P&T (partitioning and transmutation) under real conditions is the so-called BTBP family.…”

“…a) Formation of complexes between UO 2 2þ , NO3 2 , and H 2 O; b) Formation of a complex between NpO 2 þ and NO 3 2 .…”