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Title

On Cadmium (II) Membrane-Based Extraction Using Cyanex 923 as Carrier

AuthorsSastre, Ana María; Alguacil, Francisco José; Alonso Gámez, Manuel; López Gómez, Félix Antonio ; López-Delgado, Aurora
KeywordsEmulsion pertraction technique
Transport
Cadmium (II)
Cyanex 923
Issue Date2008
PublisherTaylor & Francis
CitationSolvent Extraction and Ion Exchange 26 (3) : 192 - 207 (2008)
AbstractThe 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 2.2times10-3 cm. The organic membrane diffusional resistance (Δorg) and aqueous diffusional resistance (Δaq) were calculated from the model, and their values were 1.0times107 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 4.8times10-9 cm2 s-1 and 1.3times10-9 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.
Publisher version (URL)http://dx.doi.org/10.1080/07366290802053744
URIhttp://hdl.handle.net/10261/36786
DOI10.1080/07366290802053744
ISSN0736-6299
Appears in Collections:(CENIM) Artículos
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