Competitive Solvent Extraction of Ra(II) and Ba(II) from Aqueous Solutions with Lipophilic, Acyclic, Di‐ionizable Polyethers

Abstract

Twelve lipophilic, acyclic polyethers, each with two terminal N-(X)sulfonyl carboxamate groups, are found to efficiently extract Ra(II) and Ba(II) at radiotracer levels from aqueous solution into chloroform. With the presence of Ba(II) carrier in the aqueous feed solution, very appreciable Ra(II)/Ba(II) selectivity is observed in single-stage, liquid-liquid extraction for the polyether that combines the largest polyether pseudo-cavity and the most acidic ionizable group.

Application of Flotation for Removing Barium(II) Ions Using Ionized Acyclic Polyethers in the Context of Sustainable Waste Management

“…Comparison of the results shown by curve flotation (Figure 6). Similar conclusions were obtained by Walkowiak et al [42], which investigated the separation of Ra 2+ and Ba 2+ from aqueous solutions using ionizable acyclic polyethers (4-11, 12, 13) by competitive solvent extraction in a liquid-liquid, presented in Table 3. It was The best degrees of separation of Ba 2+ were obtained at pH 9.…”

“…Similar conclusions were obtained by Walkowiak et al [42], which investigated the separation of Ra 2+ and Ba 2+ from aqueous solutions using ionizable acyclic polyethers (4-11, 12, 13) by competitive solvent extraction in a liquid-liquid, presented in Table 3. It was Similar conclusions were obtained by Walkowiak et al [42], which investigated the separation of Ra 2+ and Ba 2+ from aqueous solutions using ionizable acyclic polyethers (4-11, 12, 13) by competitive solvent extraction in a liquid-liquid, presented in Table 3. It was found that with the increase in pH, the Ba 2+ extraction degree increases.…”