Extraction Properties of 1,2,3-Triazole Modified Carbamoylmethylphosphine Oxide in Nitric Acid Media

Abstract

A novel polyfunctional neutral organophosphorus compound, 2-(diphenylphosphoryl)-N,N-diethyl-3-(1-phenyl-1H-1,2,3-triazol-4-yl)propanamide (I), was synthesized and studied as an extractant for Pd(II), Ln(III), U(VI), and Th(IV) from HNO3 solutions. The influence of aqueous and organic phases on the extraction efficiency was elucidated and stoichiometry of the complexes extracted was determined. The introduction of a 1,2,3-triazole fragment into the methylene bridge of diphenyl(diethylcarbamoylmethyl)phosphine oxide resulted in a considerable increase of the efficiency of Pd(II) extraction. The potentialities of carbon nanotubes impregnated with compound I for the preconcentration of Pd(II) from nitric acid solutions are demonstrated. The introduction of a 1,2,3-triazole fragment into the methylene bridge of a CMPO molecule does not essentially change the extraction efficiency of compound I towards U(VI) and Ln(III) but drastically decreases the Th(IV) extraction and change the order in the extractactability of U(VI) and Th(IV) with this compound from HNO3 solutions.