Abstract
The facilitated transport of cadmium (II) from HCl medium by Emulsion Pertraction Technique (EPERT), using Cyanex 923 (phosphine oxides mixture) as ionophore, is investigated as a function of various experimental variables: hydrodynamic conditions, concentration of cadmium (II) (5–100 mg L−1) and HCl (0.2–5 M) in the source phase, carrier concentration (5–40% v/v) and diluent in the organic phase. A model that describes the transport mechanism is derived, consisting of diffusion through a source aqueous diffusion layer, a fast interfacial chemical reaction, and diffusion of the carrier and the metal complexes through the membrane. The thickness of the source phase boundary layer was calculated as 2.2×10−3 cm. The organic membrane diffusional resistance (Δorg) and aqueous diffusional resistance (Δaq) were calculated from the model, and their values were 1.0×107 s cm−1 and 347 s cm−1, respectively, whereas the values of the bulk diffusion coefficient (Dorg,b) and diffusion coefficient (Dorg) also calculated from the model were 4.8×10−9 cm2 s−1 and 1.3×10−9 cm2 s−1. The separation of Cd(II) against Zn(II), Fe(III), Cr(VI) and Cu(II) and also the performance of the system in relation with other extractants were evaluated.
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