Transport of copper(II) through supported liquid membrane containing LIX65N.

Abstract

Permeation rate and transfer mechanismof copper(II) through a supported liquid membrane containing LIX65Nas a mobile carrier were studied. The experiment was carried out under the condition that the rate-determining step of the dialysis was the diffusion in the membrane. The binary diffusivities of the oxime and the copper-oxime complex for solute-solvent system and apparent diffusivity of copper in the supported liquid membranewere measured. The apparent diffusivity of copper was approximately proportional to the -1.0 power of the liquid membrane solution viscosity. The copper flux was constant in the range of pH>3in the feed solution, but decreased with decreasing pH in the range of pH<3. Copper concentration in the feed solution hardly influenced the copper flux in the range of 10"MO"1mol dm 3. The copper flux was proportional to the 1st power of the oxime concentration in the liquid membranewhen pH of the feed solution was 4.47, but the value of the power of the oxime concentration increased with decreasing value of pHof the feed solution. The concentration profile of the copper-oxime complex in a stack of the supported liquid membranewas approximately in agreement with the theory.

Kinetics of the Extraction of Succinic Acid with Tri‐n‐octylamine in 1‐Octanol Solution

“…The tortuosity factor of the membrane can be obtained with eq 6. The value is 2.73 in this study, which is reasonable as compared with the literature values of 2.0−2.8 (11, 15, 25). Therefore, the mass‐transfer coefficients of this cell with hydrophobic membrane are acceptable.…”

Mechanism and kinetics of copper permeation through a supported liquid membrane containing a hydroxyoxime as a mobile carrier

“…A rate expression identical with eq 6' has been obtained by Vblkel et al (1980) and Imato et al (1981) for the copper-LIX reagent system. In the limit when a is very large, eq 6' reduces to the form of j = (D/60)(Ct/2), which has been checked experimentally and used by Lee et al (1978) to evaluate the value of / 0) from their data.…”

“…These are either a supported liquid membrane, which is a thin high-microporous polymer film impregnated with a carrier material, or a W/O/W emulsion; i.e., the solution of carrier is reformed as small spherical shells. Since the pioneering work of Cussler (1971), who concentrated sodium ion against its concentration gradient via filter paper impregnated with monensin or stearic acid, there have been numerous papers dealing both with the applicability of the membrane (Schiffer et al, 1974; Frankenfeld and Li, 1977; Strzelbicki and Charewicz, 1978;Kitagawa et al, 1979) and the kinetic behavior of the process (Reusch and Cussler, 1973; Choy et al, 1974; Caracciolo et al, 1975; Hochhauser and Cussler, 1975;Schultz, 1977;Martin and Davies, 1977;Molnar et al, 1978; Lee et al, 1978; Largman and Sifniades, 1978; Kondo et al, 1979;Vólkel et al, 1980;Kataoka et al, 1980; Kondo et al, 1981;Imato et al, 1981).…”

Separation of copper, zinc, cobalt and nickel ions by supported liquid membrane technique using LIX 84I, TOPS-99 and Cyanex 272

“…For determination of diffusivity of the metal-extractant complex through the membrane, the time dependent concentration of the metal-extractant complexes of the dialysis experiment [26] were plotted against time 't' (Fig. 1).…”