Effect of the structure of bidentate neutral organophosphorus compounds on the extraction of Sr(II) from aqueous solutions in the presence of ionic liquids

The extraction of microamounts of Sr(II) from aqueous solutions with solutions of bidentate neutral organophosphorus compounds is considerably enhanced in the presence of ionic liquids. The efficiency of the Sr(II) extraction varies in a wide range depending on the nature of the coordinating groups in the extractant molecule, substituents at the P and N atoms, and structure of the fragment linking the coordinating groups.     

Natural Bactericidal Surfaces: Mechanical Rupture of Pseudomonas aeruginosa Cells by Cicada Wings

Natural superhydrophobic surfaces are often thought to have antibiofouling potential due to their self-cleaning properties. However, when incubated on cicada wings, Pseudomonas aeruginosa cells are not repelled; instead they are penetrated by the nanopillar arrays present on the wing surface, resulting in bacterial cell death. Cicada wings are effective antibacterial, as opposed to antibiofouling, surfaces.     

Preconcentration of Sr(II) by extraction and sorption with carbamoyl phosphine oxides in the presence of ionic liquids

Extraction of microamounts of Sr(II) from aqueous solutions with solutions of carbamoyl phosphine oxides in the presence of ionic liquids was studied. The influence of the structure of the extractants and ionic liquids on the efficiency of the Sr(II) extraction was examined, and the stoichiometry of the extractable complexes was determined. The possibility of preconcentrating Sr(II), and also U(VI), Th(IV), and REE(III) from aqueous solutions with a complexing sorbent prepared by noncovalent immobilization of diphenyl( diethylcarbamoylmethyl)phosphine oxide and 1-butyl-3-methylimidazolium bis[(trifluoromethyl)-sulfonyl]imide on a macroporous polymer matrix was demonstrated.     

Effect of the Structure of <Emphasis Type="Italic">o</Emphasis>-Methyleneoxyphenyldiphosphine Dioxides on Their Extractive Power and Selectivity in Nitric Acid Solutions

Extraction of trace amounts of Pu(IV), U(VI), Th(IV), Am(III), and REEs(III) from nitric acid solutions with o-methyleneoxyphenyldiphosphine dioxides with phenyl (I) and butyl (II) substituents at the phosphoryl group is studied. The stoichiometry of extractable complexes in dichloroethane is determined. Changing the butyl substituents for phenyl ones increases the effective extraction constants of Pu(IV), Th(IV), and Am(III) and decreases that of U(VI). In extraction from 3 M HNO³, the Pu(IV)/U(VI) and Th(IV)/U(VI) partition coefficients are higher with reagent I, and the Pu(IV)/Am(III) and U(VI)/Am(III) partition coefficients, with reagent II.     

Extraction of U(VI), Th(IV), and rare-earth elements from nitric acid solutions with phosphoryl-and carbonyl-containing podands

The distribution of HNO₃ and microamounts of nitrates of U(VI), Th(IV), La, Ce, Pr, Nd, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, and Y between aqueous solutions of HNO₃ and solutions of N,N′-dimethyl-N,N′-diphenyl-3-oxapentanediamide (I) and 1,3-bis(diphenylphosphinoyl)-2-oxapropane (II) in organic diluents was studied. The stoichiometry of the extractable complexes was determined, and the effect exerted by the extractant structure and by the organic diluent on the efficiency of recovery of rare-earth elements (REE) into the organic phase was examined. In nitric acid solutions, carbonyl-containing podand I surpasses in the extraction ability phosphoryl-containing podand II. The possibility of using a macroporous polymeric sorbent impregnated with compound I for recovering REE from nitric acid solutions was demonstrated. Original Russian Text A.N. Turanov, V.K. Karandashev, V.E. Baulin, 2007, published in Radiokhimiya, 2007, Vol. 49, No. 3, pp. 226–232.     

Extraction of REEs(III), U(VI), and Th(IV) with acidic phosphoryl-containing podands from nitric acid solutions

The extraction of microamounts of REEs(III), U(VI), and Th(IV) from HNO₃ solutions with solutions of acidic phosphoryl-containing podands in 1,2-dichloroethane was studied. The stoichiometry of the extractable complexes was determined. The influence of the extractant structure and aqueous phase composition on the efficiency and selectivity of the recovery of REEs(III), U(VI), and Th(IV) into the organic phase was considered.