Based on the unique fivefold equatorial coordination of UO22+, water-compatible pentadentate planar ligands, H2saldian and its derivatives, were designed for the strong and selective capture of UO22+ in seawater. In the simulated seawater condition (0.5 M NaCl + 2.3 mM HCO3–/CO32–, pH 8), saldian2– shows the strongest complexation with UO22+ to form UO2(saldian) (log β11 = 28.05 ± 0.07), which is more than 10 order of magnitude greater than amidoxime-based or -inspired ligand systems most commonly employed for U capture from seawater. Good selectivity for UO22+ from other metal ions coexisting in seawater was also demonstrated.
Selective recovery of uranium from seawater
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Published
(Laboratory for Zero-Carbon Energy / Dr. Koichiro Takao & Dr. Satoru Tsushima)
“Fully Chelating N3O2‑Pentadentate Planar Ligands Designed for the Strongest and Selective Capture of Uranium from Seawater”
Inorganic Chemistry (DOI:10.1021/acs.inorgchem.2c00306)
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