Metallic species (Ag+ and Cu2+ ions) transfer through a membrane—gel

Taoualit, Nadjet; Hadj-Boussaad, D.E.

doi:10.1016/s0011-9164(02)00327-2

Cited by 9 publications

(6 citation statements)

References 4 publications

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“…The maximum time of swelling of polymers is determined by the weighed successive ones, carried out according to time until obtaining a profit in stationary weight; this last corresponds to the balance of swelling [18].…”

Section: Swellingmentioning

confidence: 99%

Concentration of zinc ions in perchlorate medium by a menbrane-gel using an acid extractant (DEHPA)

Belhadji

Belkacemi

Hadj-Boussaad

2013

MATEC Web of Conferences

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Abstract. Recent decades, it is an awareness of the importance of ecological balance in the environment, balances threatened by industrial pollution. A new spirit presides we seek to minimize pollution of receiving waters. The present work is to study the liquid-gel-extraction of zinc ions in perchlorate medium by an acid extractant: the di (ethyl-2 hexyl) phosphorique acid, or DEHPA. Two types of polymers were used as supports of solvent extraction: a polybutadiene rubber cross-linked respectively with 0.1% dicumyl peroxide and 0.4% dicumyl peroxide, vulcanized at 160°C, one is most cross-linked than the other. The liquid-gel extraction is based on the principles of the liquid-liquid extraction.

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Section: Swellingmentioning

confidence: 99%

Concentration of zinc ions in perchlorate medium by a menbrane-gel using an acid extractant (DEHPA)

Belhadji

Belkacemi

Hadj-Boussaad

2013

MATEC Web of Conferences

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“…The advantages of this extraction technique are the ease of use, relatively high flows and low capital and operating costs [17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Extraction and Transport of Humic Acid using Supported Liquid-Membrane Containing Trioctyl Phosphine Oxide (TOPO) as the Carrier

et al. 2016

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Effluents or liquids of percolation from the discharges (leachates) are charged bacteriologically and especially chemically of mineral substances (mineral ions and heavy metals) and organic (volatile fatty acids, humic substances), which can contaminate soil, surface waters and ground waters. The humic substances, called also refractories, are not easily biodegradable and require concentrating them and/or adsorbing them by implementation of expensive processes. Scientists are looking for alternatives to eliminate or recover these substances. The present study investigates the elimination of humic acid from waste water using supported liquid membrane containing trioctyl phosphine oxide (TOPO) in toluene, as extractant. The supported liquid membrane is composed of a flat sheet of cross-linked polydimethylsiloxane (PDMS). In this study we have: (i) optimized the conditions for humic acid species transfer from feed aqueous phase to stripping phase across PDMS/TOPO/toluene supported liquid membrane; (ii) characterized the membrane by using FTIR technique and by determining the flux J, permeability P and diffusion coefficient of the complexed species D. Speciation of the humic acid species in the membrane organic carrier (extractant) phase has also been carried out using theoretically derived equations to elucidate the stoichiometry and mechanism of transport of humic acid across the PDMS/TOPO/toluene supported liquid membrane. Optimum conditions of transport for humic acid have been found to be: pH=3, [NaOH]=0.4 M, Eextraction = 94.67%, E diffusion = 32.5%, J = 1.34 × 10 −4 mg cm −2 s −1 , D = 1.16 × 10 −2 cm 2 s −1 and P = 2.64 cm s −1 . Kinetic parameters calculated from the experimental data have been determined. Thermodynamic functions of the several species transfer from the feed solution to the stripping one through the supported liquid membrane, such us enthalpy, entropy and Gibbs free energies, were determined. Positive values of ∆H and negative values of ∆G indicate respectively the endothermic and the spontaneous nature of the humic acid extraction in aqueous solution.

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“…To address this possibility, various researchers have proposed to absorb the organic phase extractant to solid supports such as polymers [6], they are gels (membranes) swelled by specific hydrophobic organic extractants. The performance of this process in terms of selectivity and extraction efficiency, were very interesting.…”

Section: Introductionmentioning

confidence: 99%

“…The membranes-gels are resulting from the fixation of organic extraction solvent on solid supports. The polystyrene bead form [6] or polymers of styrene-divinylbenzene, polyurethane foams, and silicone rubber were the first to be used.…”

Section: Introductionmentioning

confidence: 99%