Carrier-mediated transport of toxic elements through liquid membranes

Nowier, H. G.; El-Said, N.; Aly, H. F.

doi:10.1016/s0376-7388(00)00456-7

Cited by 33 publications

(9 citation statements)

References 8 publications

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“…It was found that the transport behavior, although from relatively high initial concentration of Pb(II) in the feed, is in good accordance with the above-described model [35,36]. The processes that can occur as interfering factors responsible for hydrochloric acid and water transport was described [38]. Under the assumptions of steady state and linear concentration gradients with very low values of K ds /K dF , ratio, where K ds and K dF are the distribution ratios of metal species between the membrane, the strip and the feed solution.…”

Section: Resultsmentioning

confidence: 61%

“…where, t is the time (s) elapsed since the beginning of the permeation process, C F and C 0F are the metal ion concentration at t and zero time, respectively, V F is the feed volume (cm 3 ), S is the effective membrane area (cm 2 ) and P is the permeability coefficient (cm/s).The interfering factors can be described [38] as the following equations:   Where S is denotes, the solvent, TBP and the bar indicates organic phase. Also, the symbols 'F-M' and 'M-S' above and below the arrow in expressions (1), (2), (3) and (4) denote 'feed membrane' interface and 'membrane-strip' interface.…”

Section: Resultsmentioning

confidence: 99%

“…This type of solid phase overcomes the limitations of solvent extraction, over use of large quantities of organic solvents while high specificity and selectivity of a liquid cation exchanger can be achieved by controlling the sorption and elution parameters. N.El-said etal studied the transport of Cd(II) from high salinity chloride medium through supported liquid membrane ,part (I) [38].We conducted the work to cover a great area of other toxic elements such as pb (II),Cr(III),etc.…”

Section: Introductionmentioning

confidence: 99%

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Carrier mediated transport of toxic elements, part II Transport modeling for extraction of Pb (II) by Cyanex302/xylene as carrier from nitrate medium using SLM

El-Said¹,

Rahman²,

Ali³

2014

IOSRJAC

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Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Carrier mediated transport of toxic elements, part II Transport modeling for extraction of Pb (II) by Cyanex302/xylene as carrier from nitrate medium using SLM

El-Said¹,

Rahman²,

Ali³

2014

IOSRJAC

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“…However, the transport process of the Ag + ion through the membrane phase decreases at lower or higher concentrations of Na 2 S 2 O 3 . In the studies by Nowier et al 36 and Altin et al 20 it was reported that increasing stripping phase concentration facilitates achieving an optimum permeability value. The reason for this may be explained as the concentration of the solute increases, the solution reaches saturation value and, therefore, the solubility decreases.…”

Section: Effect Of Stripping Agent In Receiving Phasementioning

confidence: 99%

Selective Transport of Silver(I) Cation Across a Bulk Liquid Membrane Containing Bis-β-enamino Ester as Ion Carrier

Tarahomi

Rounaghi

Daneshvar

et al. 2016

Journal of the Brazilian Chemical Society

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Facilitated transport of silver(I) cation across a bulk liquid membrane by two synthesized ligands, bis-β-enamino ester (BBEE) and bis(benzoic acid) trioxaheptane (BBAT), as carriers dissolved in dichloromethane has been investigated. BBEE was used as a specific ion carrier for the transport of silver(I) ion. The influence of experimental parameters affecting the transport efficiency of silver(I) ion have been studied. In the presence of thiosulfate as a suitable metal ion acceptor in the receiving phase and picrate ion as ion pairing agent in the source phase, the amount of silver(I) ion transported across the liquid membrane after 120 min was found to be 97%. Tolerance to the presence of different ions was investigated and it was found that silver(I) cation transport was not affected even in the presence of 10-fold concentration of these metal cations in solution. This system was applied for the recovery of silver(I) cation from silver plating and photographic waste solution.

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“…In such systems, it cannot be assumed that the distribution constant at the feed/membrane interface is much larger than that at the membrane/stripping interface. Accordingly, the lack of model fit is particularly apparent in the ln(c f /c f,t = 0 ) vs. time plots on which the experimental points deviate from the linear model [3,10,[13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Some Critical Remarks about Mathematical Model Used for the Description of Transport Kinetics in Polymer Inclusion Membrane Systems

Szczepański

2020

Membranes

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Two kinetic models which are applied for the description of metal ion transport in polymer inclusion membrane (PIM) systems are presented and compared. The models were fitted to the real experimental data of Zn(II), Cd(II), Cu(II), and Pb(II) simultaneous transport through PIM with di-(2-ethylhexyl)phosphoric acid (D2EHPA) as a carrier, o-nitrophenyl octyl ether (NPOE) as a plasticizer, and cellulose triacetate (CTA) as a polymer matrix. The selected membrane was composed of 43 wt. % D2EHPA, 19 wt. % NPOE, and 38 wt. % CTA. The results indicated that the calculated initial fluxes (from 2 × 10−11 up to 9 × 10−10 mol/cm2s) are similar to the values observed by other authors in systems operating under similar conditions. It was found that one of the most frequently applied models based on an equation similar to the first-order chemical reaction equation leads to abnormal distribution of residuals. It was also found that application of this model causes some problems with curve fitting and leads to the underestimation of permeability coefficients and initial maximum fluxes. Therefore, a new model has been proposed to describe the transport kinetics in PIM systems. This new model, based on an equation similar to the first-order chemical reaction equation with equilibrium, was successfully applied. The fit of this model to the experimental data is much better and makes it possible to determine more precisely the initial maximum flux as the parameter describing the transport efficiency.

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Carrier-mediated transport of toxic elements through liquid membranes

Cited by 33 publications

References 8 publications

Carrier mediated transport of toxic elements, part II Transport modeling for extraction of Pb (II) by Cyanex302/xylene as carrier from nitrate medium using SLM

Carrier mediated transport of toxic elements, part II Transport modeling for extraction of Pb (II) by Cyanex302/xylene as carrier from nitrate medium using SLM

Selective Transport of Silver(I) Cation Across a Bulk Liquid Membrane Containing Bis-β-enamino Ester as Ion Carrier

Some Critical Remarks about Mathematical Model Used for the Description of Transport Kinetics in Polymer Inclusion Membrane Systems

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