Technique of supported liquid membranes (SLMs) for the facilitated transport of vanadium ions (VO2+)

Hor, Mustapha; Riad, A.; Benjjar, Abdelkhalek; Lebrun, Laurent; Hlaı̈bi, Miloudi

doi:10.1016/j.desal.2009.12.023

Cited by 45 publications

(23 citation statements)

References 35 publications

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“…These results also indicate that MC agent is more effective than its counterpart TOA for this facilitated extraction phenomenon of Cd 2+ ions by SLM membranes because the transition state on the association of the substrate with MC agent requires low energy ( ΔH # = 18.33 kJ mol −1 ), and it is ordered ( ΔS # = ‐ 258 J. K −1 .mol −1 ), therefore the passage by this state is easy. Moreover, all these results confirmed the work published by Smith et al and Hor et al, which indicates that for these facilitated transport and extraction processes through different membrane types, the movement of the substrate during its passage across the membrane organic phase, is not a pure diffusion movement, but it is a movement by successive jumps of substrate from one site to another of mobile or fixed carrier agent, according to association/dissociation reactions (Figure ).…”

Section: Resultssupporting

confidence: 89%

“…However, the initial flux J 0 of Cd 2+ ions through each membrane changes as the initial concentration C 0 of the substrate. This evolution of the macroscopic parameters ( P and J 0 ) on this facilitated extraction phenomenon was indicated by Hassoune et al for the transport of some organic compounds and by some of our work on the facilitated extraction of other ions . For this membrane type, the results also indicate that for this phenomenon, the values of the parameters P and J 0 are much higher for facilitated extraction of metal ions compared to organic molecules such as sugars or alditols.…”

Section: Resultssupporting

confidence: 84%

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Effective supported liquid membranes for facilitated extraction phenomenon of cadmium (ii) ions from acidic environments: Parameters and mechanism

et al. 2015

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We have developed three new supported liquid membranes (SLMs), for removal of Cd(II) from acidic environments. For the preparation of adopted membranes, we used a plate paper of the polymer PVDF, as porous support with thickness of 100 μm and pore diameter of 0.45 μm, and respectively, amphiphilic molecules of methyl cholate (MC), Trioctylphosphine oxide (TOPO) or tri‐n‐octylamine (TOA) as extractive agents, each dissolved in the organic phase toluene. We have developed a kinetic model to calculate the macroscopic parameters, permeability (P) and initial flux (J0) on the adopted membrane, and a thermodynamic model to determine the microscopic parameters, association constants (Kass) and apparent diffusion coefficients (D*), specific to the association of the substrate with the extractive agent, and diffusion of formed complex (TS) through the membrane organic phase. The proposed models verify the experimental results. We observed the influence of the agent nature, its concentration and the substrate concentration, on the parameters for the facilitated extraction of these ions through each of the developed membranes. On the other hand, these results show that the migration of Cd(II) through the membrane, is not a simple diffusion movement, but this migration is done according to the substrate successive jumps from one site to the other of extractive agent. In order to understand this mechanism and explain the obtained results, we have studied temperature factor influence, and we have calculated the activation parameters (Ea, ΔH≠, Δ S≠) related to the transition state for the association reaction of substrate with MC and TOA agents.

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Section: Resultssupporting

confidence: 89%

Section: Resultssupporting

confidence: 84%

Effective supported liquid membranes for facilitated extraction phenomenon of cadmium (ii) ions from acidic environments: Parameters and mechanism

et al. 2015

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“…The concentrations of the substrate (VO 2 + ions) versus time for these samples are determined by ultraviolet–visible spectroscopic analysis. The facilitated transport process ends with a dynamic equilibrium that is established between the two compartments with C s = C r = C 0 /2 and equal diffusion rates in the two opposite directions …”

Section: Methodsmentioning

confidence: 96%

Grafted polymer membranes with extractive agents for the extraction process of VO₂⁺ ions

Kamal

Eljaddi

Atmani

et al. 2016

Polymers for Advanced Techs

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To conduct experiments related to the facilitated extraction phenomenon and recovery of vanadium ions VO2+, two grafted polymer membranes were prepared; containing respectively cholic acid and azithromycin as extractive agents and the obtained membranes were characterized. All experiments for the facilitated extraction phenomenon of these ions were carried out. Kinetic and thermodynamic models, based on the interaction of the substrate S (VO2+) with the extractive agent T, and the diffusion of the formed entity (TS) through the membrane were developed, to determine the macroscopic parameters, permeability P and initial fluxes J0, and the microscopic parameters, association constants Kass and apparent diffusion coefficients D*, related to the formation of entities TS and their diffusion. A clear evolution of these parameters, depending on various factors (substrate concentration C0, extractive agent concentration and feed and receiving phases temperature), and high permeabilities for this extraction phenomenon of VO2+ ions were observed for this membrane type. Copyright © 2016 John Wiley & Sons, Ltd.

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“…The experimental results indicate that the permeabilities P of the used SLMs-MC vary inversely with the initial concentration C 0 of the LAS, and an increase in C 0 results in a decrease in permeabilities, however, the initial flux values J 0 for this compound for each of the studied SLMs-MC, increase as the initial concentration C 0 of LAS increases. These evolutions of the macroscopic parameters on this facilitated extraction phenomenon was indicated by Touaj et al [24] for the transport of some disaccharide sugars and by Hor et al [25] for the facilitated extraction of VO 2 + ions. Also the results show clearly that the values of permeabilities P and fluxes J 0 increase as the pH of the feed and stripping solutions decreases, hence the acidity of the extraction medium increase.…”

Section: Effect Of the Substrate Initial Concentration And The Ph Of mentioning

confidence: 63%

Facilitated Transport of Lysine Acetylsalicylate Through Supported Liquid Membrane Using Methyl Cholate as Carrier: Parameters and Mechanism

Kamal¹

2017

AJCHE

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Transport of lysine acetylsalicylate (LAS) through supported liquid membrane was investigated using methyl cholate (MC) as extractive agent. Kinetic and thermodynamic models were developed, based on the interaction of the substrate LAS with the extractive agent T, and the diffusion of the formed entity (TS) through the membrane. The experimental results verify the models and enable the determination of macroscopic parameters (permeabilities (P) and initial fluxes (J 0 )), as well as microscopic parameters (association constants (K ass ), and apparent diffusion coefficients (D*)), relating to formed entity (TS) and its diffusion through the membrane organic phase. Parameters such as initial concentration of the substrate in the feed phase, pH of the feed and stripping phases and temperature of the extraction medium were studied. The results obtain indicate that the mechanism of the migration of LAS through the membrane organic phase cannot be a pure diffusion movement but it takes place by successive jumps from one site to another of the extractive agent, via interaction reactions with LAS.

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Technique of supported liquid membranes (SLMs) for the facilitated transport of vanadium ions (VO2+)

Cited by 45 publications

References 35 publications

Effective supported liquid membranes for facilitated extraction phenomenon of cadmium (ii) ions from acidic environments: Parameters and mechanism

Effective supported liquid membranes for facilitated extraction phenomenon of cadmium (ii) ions from acidic environments: Parameters and mechanism

Grafted polymer membranes with extractive agents for the extraction process of VO₂⁺ ions

Facilitated Transport of Lysine Acetylsalicylate Through Supported Liquid Membrane Using Methyl Cholate as Carrier: Parameters and Mechanism

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Technique of supported liquid membranes (SLMs) for the facilitated transport of vanadium ions (VO2+)

Cited by 45 publications

References 35 publications

Effective supported liquid membranes for facilitated extraction phenomenon of cadmium (ii) ions from acidic environments: Parameters and mechanism

Effective supported liquid membranes for facilitated extraction phenomenon of cadmium (ii) ions from acidic environments: Parameters and mechanism

Grafted polymer membranes with extractive agents for the extraction process of VO2+ ions

Facilitated Transport of Lysine Acetylsalicylate Through Supported Liquid Membrane Using Methyl Cholate as Carrier: Parameters and Mechanism

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Grafted polymer membranes with extractive agents for the extraction process of VO₂⁺ ions