Extraction studies of actinides and lanthanides by bifunctional H-phosphonates
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C. V. S. Brahmmananda Rao
,
S. Jayalakshmi
Abstract
The extraction behavior of actinides and lanthanides was investigated by three homologues of H-phosphonates viz. diamylhydrogen phosphonate (DAHP), dihexylhydrogen phosphonate (DHeHP) and dioctylhydrogen phosphonate (DOHP). These compounds were synthesized, characterized by using elemental analysis, IR, NMR (1H, 13C and 31P) and mass spectroscopy. The extraction behavior of these ligands was compared with a member of dialkylalkyl phosphonate viz. diamylamyl phosphonate (DAAP). The present study has been taken up to understand the influence of phosphorus bonded hydrogen and alkyl groups in H-phosphonates on the extraction behavior of actinides and lanthanides. The important physicochemical properties such as density, viscosity, phase disengagement time, dispersion number and solubility are also reported for the first time. These compounds extract actinides through the P–OH group which is present in tautomeric equilibrium with the P–H bond at lower acidities, and through the phosphoryl group at higher acidities thus exhibiting a dual behaviour. The physical properties can be modified by suitably designing the extractant based on the requirement for a given purpose. The H-phosphonates have potential applications in pre-concentration of large quantities of dilute solutions of uranium and plutonium.
©2014 Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Frontmatter
- Integral cross section measurements of a few threshold reactions induced by Am/Be neutrons
- Effect of irradiation on some actinide and fission product ions' extraction using several tetraalkyl diglycolamides
- Extraction studies of actinides and lanthanides by bifunctional H-phosphonates
- Demonstration of trivalent actinide partitioning from simulated high-level liquid waste using modifier-free unsymmetrical diglycolamide in n-dodecane
- Preparation, characterization and thermodynamic properties of Zr-containing Cl-bearing layered double hydroxides (LDHs)
- Box-Behnken design in modeling of solid-phase tea waste extraction for the removal of uranium from water samples
- Sequestering of thorium ions from aqueous media on rice husk: Equilibrium, kinetic and thermodynamic studies
- Rapid Communication
- Production of no-carrier-added radiobromine: new nickel selenide target and optimized separation by dry distillation
Articles in the same Issue
- Frontmatter
- Integral cross section measurements of a few threshold reactions induced by Am/Be neutrons
- Effect of irradiation on some actinide and fission product ions' extraction using several tetraalkyl diglycolamides
- Extraction studies of actinides and lanthanides by bifunctional H-phosphonates
- Demonstration of trivalent actinide partitioning from simulated high-level liquid waste using modifier-free unsymmetrical diglycolamide in n-dodecane
- Preparation, characterization and thermodynamic properties of Zr-containing Cl-bearing layered double hydroxides (LDHs)
- Box-Behnken design in modeling of solid-phase tea waste extraction for the removal of uranium from water samples
- Sequestering of thorium ions from aqueous media on rice husk: Equilibrium, kinetic and thermodynamic studies
- Rapid Communication
- Production of no-carrier-added radiobromine: new nickel selenide target and optimized separation by dry distillation
