Study on synergistic extraction of uranium (VI) with 1, 9-bis(1'-phenyl-3'-methyl-5'-oxopyrazol-4'-yl)-1, 9-nonanedione and neutral phosphorus based extractants

The behaviour of synergistic extraction by 1, 9-bis(1'-phenyl-3'-5'-oxopyrazol-4'-yl)-1, 9-nonanedione (simplified as H2A) and neutral phosphorus-based extractants (simplified as B) for uranium (VI) is investigated. By using slope analysis method the formula of the extracted complexes are shown to be UO2A ·B (B represents TPPO and TOPO, respectively). The synergistic extraction equilibrium constants are calculated. The solid extracted complexes are prepared with extraction methods. The compounds are studied by elemental analysis, UV, IR and HNMR spectroscopy