Transport and separation of uranium(VI) by a polymer inclusion membrane based on di-(2-ethylhexyl) phosphoric acid

Abstract

Di-(2-ethylhexyl) phosphoric acid (D2EHPA) is a commonly used extraction reagent for the separation of uranium from aqueous solutions. Previous work showed the suitability of a polymer inclusion membrane (PIM) based on D2EHPA and poly(vinyl chloride) (PVC) for the extraction and transport of uranium(VI) from sulfate solutions. This study details the improvement of the membrane transport by optimising the composition of the source and receiving solutions on one hand and membrane composition with the use of a plasticizer on the other. Initial fluxes of uranium as high as 3.0×10 -6molm -2s -1 corresponding to permeability of 7.2×10 -6ms -1 were recorded using a membrane composed of 35% (m/m) D2..