Kinetic modelling of the facilitated transport of cadmium (II) using Cyanex 923 as ionophore

被引：0
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作者：
Alonso, Manuel [1 ]
López-Delgado, Aurora [1 ]
Sastre, Ana María [2 ]
Alguacil, Francisco José [1 ]
机构：
[1] Centro Nacional de Investigaciones Metalúrgicas (CSIC), Ciudad Universitario, Avda. Gregorio Del Amo 8, 28040 Madrid, Spain
[2] Department of Chemical Engineering, Universitat Politecnica de Catalunya, E.T.S.E.I.B., Diagonal 647, E-08028 Barcelona, Spain
来源：
Chemical Engineering Journal | 2006年 / 118卷 / 03期
关键词：
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 (Δorg) and aqueous diffusional resistance (Δaq) were calculated from the model; and their values were 196145 and 260 s cm-1; respectively; whereas the values of the bulk diffusion coefficient (Dorg; b) and diffusion coefficient (Dorg) also calculated from the model were 2.4 × 10-7 and 6.4 × 10-8 cm2 s-1. The separation of Cd(II) against Zn(II); Fe(III); Co(II) and Cu(II) is evaluated. © 2006 Elsevier B.V. All rights reserved;
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页码：213 / 219
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