Studies on the transport of chromium(III) through a supported liquid membrane containing D2EHPA as carrier

Zaghbani, Asma; Tayeb, Rafik; Dhahbi, Mahmoud

doi:10.5004/dwt.2009.968

Cited by 11 publications

(7 citation statements)

References 32 publications

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“…Increasing the amount of carrier, which is responsible for the forming of a transport structure creates favorable conditions for the rapid penetration of Cr(III) ions to the membrane and their efficient transport [13]. It is also known that the initial concentration of transported ions have also significant impact on the transport efficiency in the SLM [3,6,7]. Therefore, to confirm this assumption we carried out similar studies for three times higher initial chromium(III) concentration = 0.006 mol/dm 3 .…”

Section: Resultsmentioning

confidence: 99%

“…The applications of SLMs with organophosphorus compounds as metal ions carriers (used for chromium concentration and separation) have been shown in several papers [7][8][9]. The most commonly used organophosphorus compounds as chromium(III) carriers in membrane systems are: di (2-ethylhexyl) phosphoric acid (D2EHPA) and bis (2,4,4-trimethyl) phosphine acid (Cyanex272).…”

Section: Introductionmentioning

confidence: 99%

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The possibility of using a mathematical model based on consecutive first-order reactions to describe the Cr(III) ions pertraction in DCSLM system

2017

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This paper discusses the use of double-carrier supported liquid membrane (DCSLM) for extraction of Cr(III) ions, using the D2EHPA/CYANEX272 mixture as the carriers. Based on the calculated value of the activation energy and on the assumption that the result of transport process in the DCSLM, in particular, depends on the accumulation of intermediate products in the membrane, the mathematical model of the chromium(III) ions separation based on consecutive first-order reactions has been proposed. Transport kinetics of chromium(III) in studied system for different carriers concentrations ratio and their comparison with theoretical prediction was analyzed. The obtained results confirmed the presence of a synergistic effect of selected carriers in DCSLM. Verification of the proposed model has been carried out in the article. Mathematical model describes correctly the membrane transport process only for most effective carriers ratio. It was found that depending on the carriers ratio in DCSLM the transport processes may be controlled by both chemical reaction and diffusion. The described model can be a useful tool for quickly and approximate determination of the transport process parameters in experimental works but is too simple to correctly describe the Cr(III) ions pertraction in supported liquid membrane system under the full range of process parameters (especially concentrations and proportions of the used carrier).

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The possibility of using a mathematical model based on consecutive first-order reactions to describe the Cr(III) ions pertraction in DCSLM system

2017

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“…Initial Co(II) fluxes were determined, according to Equation (10) [ 42 ], from the slope of the straight line obtained when plotting the Co(II) concentration in the product phase ([Co +2 ] pt ) as a function of time during the first four hours of the experiment, because of the linear relationship observed during that time.

…”

Section: Methodsmentioning

confidence: 99%

Pertraction of Co(II) through Novel Ultrasound Prepared Supported Liquid Membranes Containing D2EHPA. Optimization and Transport Parameters

et al. 2020

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Pertraction of Co(II) through novel supported liquid membranes prepared by ultrasound, using bis-2-ethylhexyl phosphoric acid as carrier, sulfuric acid as stripping agent and a counter-transport mechanism, is studied in this paper. Supported liquid membrane characterization through scanning electron microscopy, energy-dispersive X-ray spectroscopy and Fourier transform infrared spectroscopy shows the impregnation of the microporous polymer support by the membrane phase by the action of ultrasound. The effect on the initial flux of Co(II) of different experimental conditions is analyzed to optimize the transport process. At these optimal experimental conditions (feed phase pH 6, 0.5 M sulfuric acid in product phase, carrier concentration 0.65 M in membrane phase and stirring speed of 300 rpm in both phases) supported liquid membrane shows great stability. From the relation between the inverse of Co(II) initial permeability and the inverse of the square of carrier concentration in the membrane phase, in the optimized experimental conditions, the transport resistance due to diffusion through both the aqueous feed boundary layer (3.7576 × 104 s·m−1) and the membrane phase (1.1434 × 1010 s·m−1), the thickness of the aqueous feed boundary layer (4.0206 × 10−6 m) and the diffusion coefficient of the Co(II)-carrier in the bulk membrane (4.0490 × 10−14 m2·s−1), have been determined.

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“…have been reported in the literature [1][2][3]. The major component of solid wastes of metallurgical zinc industries is copper.…”

Section: Introductionmentioning

confidence: 98%

Factorial design in optimization of extraction procedure for copper (II) using Aliquat 336 and Tri-n-butylphosphate based supported liquid membrane

Medjahed

Didi

Villemin

2014

Desalination and Water Treatment

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In the present paper, extraction procedure for copper (II) present in an aqueous sulphate media using a supported liquid membrane by chloride tri-N-octylmethylammonium (Aliquat 336) and Tri-n-butylphosphate from molar ratio 1:1, with polytetrafluoroethylene as a membrane support was studied. The effects of various parameters such as initial pH, potassium thiocyanate concentration and ammonium acetate concentration on the extraction yield, were carried out. By a calculation programme using Chemical Equilibrium in Aquatic System V. L20.1, the determination of the percentages of the present species before and after extraction were given in aqueous medium and on the membrane to be able to determine the relation between the nature of the extracted species and the extraction yield. The optimization process was carried out using 2 3 factorial designs. Initial pH (pH i ) of feed solution, the concentration of potassium thiocyanate and the concentration of ammonium acetate were regarded as factors in the optimization. Student's t-test on the results of the 2 3 factorial design with eight runs for copper (II) extraction demonstrated that the factor concentration of potassium thiocyanate in the levels studied are statistically significant. Under the optimum conditions the percentage of extracted copper (II) was 93.6% in one step.

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Studies on the transport of chromium(III) through a supported liquid membrane containing D2EHPA as carrier

Cited by 11 publications

References 32 publications

The possibility of using a mathematical model based on consecutive first-order reactions to describe the Cr(III) ions pertraction in DCSLM system

The possibility of using a mathematical model based on consecutive first-order reactions to describe the Cr(III) ions pertraction in DCSLM system

Pertraction of Co(II) through Novel Ultrasound Prepared Supported Liquid Membranes Containing D2EHPA. Optimization and Transport Parameters

Factorial design in optimization of extraction procedure for copper (II) using Aliquat 336 and Tri-n-butylphosphate based supported liquid membrane

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