Aqueous hybrid liquid membrane

Eyal, Aharon M.; Kislik, Vladimir S.

doi:10.1016/s0376-7388(99)00113-1

Cited by 22 publications

(6 citation statements)

References 25 publications

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“…6 and 7) as a typical property of the LMs made of DCE. The results concerning the aquatic membrane system can be compared with the results reported by Eyal and Kislik21 for Cu 2+ and Cd 2+ permeated in the hybrid membrane system with the LM containing sodium poly(vinyl sulfonate) as the macroionophore. The previous authors reported fluxes ranging from 3.2 × 10 −10 to 6.2 × 10 −10 mol/cm 2 s (i.e., permeability coefficients equal to approximately 1.6–3.1 × 10 −6 cm/s), which are similar to our results, which varied from 3.2 × 10 −10 to 6.2 × 10 −10 mol/cm 2 s (permeability coefficients = 2.9–6.9 × 10 −5 cm/s).…”

Section: Resultsmentioning

confidence: 99%

“…The amphiphilic character of PPOEP allowed construction of a hybrid membrane system with an aqueous LM. The use of water‐soluble polymers in LM systems is a relatively new idea aimed for the solution of the problems of membrane biomimetics18, 19 or preparation of some new membranes of practical importance 20, 21. The application of polylectrolytes for this purpose is possible on condition that the external, additional polymer membranes (porous of functionalized) are impermeable for the macroionophore.…”

Section: Resultsmentioning

confidence: 99%

“…carboxylated polystyrene) was used for transporting some amino acids by Ersoz et al15 In our laboratory, similar investigations concerning the application of poly(alkylene phosphates)16 and poly[poly(oxyethylene) phosphate]s (PPOEPs)16, 17 as transporters of transient metal cations through the bulk and emulsion LMs were carried out. Moreover, water soluble organic polyphosphates,18–20 sodium poly(vinyl sulfonate), and branched polyethylenimine21 were used by some authors for preparing new hybrid aqueous LMs for the separation of metal cations or organic anions. The most promising macroionophores can, however, be synthesized on the basis of poly(ethylene glycol) (PEG) as an easily available and cheap polymer with properties parallel to the 18‐crown‐6 ether macrocycle.…”

Section: Introductionmentioning

confidence: 99%

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Pertraction of cations in a hybrid membrane system containing soluble polymeric ionophores

Wódzki

Świątkowski

Kałużyński

et al. 2002

J of Applied Polymer Sci

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A hybrid membrane system composed of two insoluble cation-exchange membranes (Nafion) and a liquid membrane in between was studied. A series of organic and aqueous liquid membranes containing soluble polymers as macromolecular ionophores (macroionophores) was prepared and tested. The pertraction (membrane-transport) characteristics of poly(ethylene glycol) and its ionizable derivatives, including as poly[poly(oxyethylene) phosphate] (PPOEP) and di-[-methoxy poly(oxyethylene)] phosphate, were measured and are discussed as dependent on the composition and molecular mass of a macroionophore. The liquid membrane composed of PPOEPs dissolved in dichloroethane combined the cation-exchange properties with neutral coordination functionalities introduced by the poly(oxyethylene) backbone of this ionophore. The overall fluxes, facilitation factors, and the membrane system selectivity were measured in the carrier-mediated pertraction of transient metal cations (Cu . In the case of an aquatic hybrid membrane system, high but nonselective ionic fluxes were observed.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Pertraction of cations in a hybrid membrane system containing soluble polymeric ionophores

Wódzki

Świątkowski

Kałużyński

et al. 2002

J of Applied Polymer Sci

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“…The analysis of the processes in which the minerals or waste containing thorium are processed shows that the classic technologies have material losses in the environment, which could be reduced with or through membrane techniques [ 232 , 233 , 234 , 235 , 236 , 237 , 238 , 239 , 240 , 241 , 242 , 243 , 244 , 245 , 246 , 247 , 248 , 249 , 250 , 251 , 252 , 253 , 254 , 255 ]. Thus, in the classical thorium recovery technologies, some disadvantages [ 1 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 , 47 , 48 , 49 , 50 , 51 , 52 , 53 , 54 , 55 , 56 , 57 , 58 , 59 , 60 , 61 , 62 , 63 , 64 , 65…”

Section: Problems In Application and Achievement As Well As Developme...mentioning

confidence: 99%

“…The problem of thorium separation, concentration and recycling can be approached by analyzing some of the contributions that offer both priority research directions and viable technical solutions ( Table 6 ) [ 232 , 233 , 234 , 235 , 236 , 237 , 238 , 239 , 240 , 241 , 242 , 243 , 244 , 245 , 246 , 247 , 248 , 249 , 250 , 251 , 252 , 253 , 254 , 255 ].…”

Section: Problems In Application and Achievement As Well As Developme...mentioning

confidence: 99%

Thorium Removal, Recovery and Recycling: A Membrane Challenge for Urban Mining

Man,

Albu,

Nechifor

et al. 2023

Membranes

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Although only a slightly radioactive element, thorium is considered extremely toxic because its various species, which reach the environment, can constitute an important problem for the health of the population. The present paper aims to expand the possibilities of using membrane processes in the removal, recovery and recycling of thorium from industrial residues reaching municipal waste-processing platforms. The paper includes a short introduction on the interest shown in this element, a weak radioactive metal, followed by highlighting some common (domestic) uses. In a distinct but concise section, the bio-medical impact of thorium is presented. The classic technologies for obtaining thorium are concentrated in a single schema, and the speciation of thorium is presented with an emphasis on the formation of hydroxo-complexes and complexes with common organic reagents. The determination of thorium is highlighted on the basis of its radioactivity, but especially through methods that call for extraction followed by an established electrochemical, spectral or chromatographic method. Membrane processes are presented based on the electrochemical potential difference, including barro-membrane processes, electrodialysis, liquid membranes and hybrid processes. A separate sub-chapter is devoted to proposals and recommendations for the use of membranes in order to achieve some progress in urban mining for the valorization of thorium.

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Liquid Membranes, Supported and Emulsion

Víllora

2013

Encyclopedia of Membrane Science and Technology

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Liquid membranes (LMs) constitute an emerging technique that can be used as an alternative for separation processes, mainly due to their high efficiency, and as such are being looked into for industrial applications. This article provides information on two types of LMs, supported liquid membrane (SLM) and emulsion liquid membrane (ELM), presenting the principles, methods of preparation, transport mechanisms, stability, and applications of a number of separation processes. SLMs use porous supports impregnated with a solvent. Solute molecules dissolve into the membrane at the feed/membrane interface, and the dissolved species diffuse through the membrane and desorb at the receiving phase. Numerous processes based on SLMs have been proposed as effective methods for the separation of different chemical species, such as organic compounds, metal ions, gas mixtures, or pharmaceutical compounds. Nevertheless, the application of SLMs on a large scale is still limited due to inadequate membrane stability. Much effort has been put into to improve SLM stability, and one possible alternative is to substitute organic solvents in the membrane by room temperature organic liquids (ILs), which possess unique properties that are interesting in the context of LMs. Thus, supported ionic liquid membranes (SILMs) receive special attention in this article. ELMs are prepared by the intensive mixing of two nonmiscible phases (e.g., water droplets in an oil phase) and the addition of some strong surfactant. Some recent advances in this field are presented.

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Aqueous hybrid liquid membrane

Cited by 22 publications

References 25 publications

Pertraction of cations in a hybrid membrane system containing soluble polymeric ionophores

Pertraction of cations in a hybrid membrane system containing soluble polymeric ionophores

Thorium Removal, Recovery and Recycling: A Membrane Challenge for Urban Mining

Liquid Membranes, Supported and Emulsion

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