Journal article

Mathematical modeling of the extraction of uranium(VI) into a polymer inclusion membrane composed of PVC and di-(2-ethylhexyl) phosphoric acid

Spas D Kolev, Alexander M St John, Robert W Cattrall

JOURNAL OF MEMBRANE SCIENCE | ELSEVIER | Published : 2013

Abstract

A mathematical model describing the extraction of uranium(VI) from sulfuric acid solutions into polymer inclusion membranes composed of di(2-ethylhexyl) phosphoric acid (D2EHPA) and poly(vinyl chloride) (PVC) has been developed and numerically solved. It assumes ideal mixing in the solution and Fickian diffusion of the uranium(VI)-D2EHPA complex within the membrane. The model has been fitted to transient extraction data obtained for different membrane compositions and thicknesses and different initial solution concentrations of uranium(VI) and sulfuric acid. This has allowed a reliable determination of the membrane extraction constant (Kex=4.72×103) and diffusion coefficient (Dm=4.13×10-14, ..

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