Perfluorinated phosphine oxide and sulfides as extractants for heavy metals and radionuclides

摘要

New highly fluorinated monodentate and bidentate phosphine oxide compounds of the type {CF_3(CF_2)nCH_2CH_2}_3P=O (n = 5, 9) and [{CF_3CF_2)_5CH_2 have been prepared. Their ability to extract a number of metals and radionuclides from aqueous solutions into perfluorinated solvents has been established and the extractable species investigated. All extractants extract the metals As(V), Cd(II), Co(II), Cr(VI), Hg(II), Pb(II), and Sn(II) with >75% removal. In addition, the radioisotopes ~(90)Sr(II), ~(133)Ba(II), and U(VI) have been investigated, whilst 59Fe(III) has been used to model the extraction of plutonium. ~(133)Ba(ll) shows a high distribution ratio for monodentate phosphine oxides, whilst for UO_2~(2+) and ~(59)Fe(III) bidentate phosphine oxides are superior.%School of Chemistry, University of Dublin, Trinity College, Dublin 2, Ireland ,School of Science & Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 6NS, UK;School of Science & Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 6NS, UK;School of Science & Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 6NS, UK;School of Science & Technology, Nottingham Trent University, Clifton Lane, Nottingham NG11 6NS, UK;