Abstract
Abstract The facilitated transport of cadmium (II) from chloride through a flat-sheet supported liquid membrane is studied, using Cyanex 923 (phosphine oxides mixture) as ionophore, as a function of various experimental variables: hydrodynamic conditions, concentration of cadmium (II) (0.01–0.08 g l −1 ) and HCl (0.1–5 M) in the feed phase, carrier concentration (2.5–40%, v/v) and diluent in the membrane phase. A model is derived that describes the transport mechanism, consisting of diffusion through a feed aqueous diffusion layer, a fast interfacial chemical reaction, and diffusion of carrier and the metal complexes through the organic membrane. The organic membrane diffusional resistance ( Δ org ) and aqueous diffusional resistance ( Δ aq ) were calculated from the model, and their values were 196145 and 260 s cm −1 , respectively, whereas the values of the bulk diffusion coefficient ( D org,b ) and diffusion coefficient ( D org ) also calculated from the model were 2.4 × 10 −7 and 6.4 × 10 −8 cm 2 s −1 . The separation of Cd(II) against Zn(II), Fe(III), Co(II) and Cu(II) is evaluated.
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