Two-Component Emulsion Liquid Membranes with Macromolecular Carriers of Divalent lons

Abstract

Experimental investigations are presented on the application of poly-[poly(ethylene glycol) phosphate] (PEGP) as a macromolecular, multisite, carrier of ions in an emulsion liquid membrane system. This polymer acts as a mobile carrier and surfactant-stabilizing WIOI W emulsion. The transport properties of PEGP have been checked for systems composed of (a) a feed phase containing Ni(II), Co(I1) or Cu(I1) ions; (b) an organic phase, i.e., PEGP dissolved in 1.2-dichloroethane; and (c) 1 M sulfuric acid as a receiving solution. Fast and effective membrane extraction of Ni(I1) has been found for membranes with PEGP of molecular weight 22,000. It has been proved that the affinity of PEGP toward the studied ions is reversed in comparison with that for poly(ethy1ene glycol). The affinity order of PEGP toward the tested ions is Ni(I1) > Co(I1) > Cu(I1).

Mobile Macromolecular Carriers of Ionic Substances, 2. Transport Rates and Separation of Some Divalent Cations by Poly(oxyethylene) Phosphates

“…Taking the fluxes listed in Table 2 into account, one can consider some of the studied macromolecular carriers (e. g. 2 b) to be able to transport transient divalent metals at a rate of l2 N 10 -11 mol/(cm 2 N s). On the other hand, some macrocycles containing a dialkylhydrogenphosphate moiety (5) with 17 ring molecules were reported [40] to transport diva- It is known from other studies [15,18,26] , that PEGs are carriers/extractants with properties parallel to those of crown ethers. This means that they can operate according to the co-transport mechanism by forming neutral complexes with ion pairs.…”

“…On the other hand, some frontier studies were carried out to evaluate soluble macromolecular compounds as active components of liquid membranes expected to transport metal cations, [12 -20] organic [13,21,22] and gaseous substances [23] selectively. Specifically poly(ethylene glycol)s were used for preparing ELMs and transporting various cations [15,18] according to the co-transport mechanism. After doping with Rh 3+ salts, poly(ethylene glycol)s were found to be efficient in the transport and separation of some hydrocarbons from nitrogen.…”

“…[26 -29] The modification of PEG by introducing phosphodiester units [30,31] or phosphoric acid end groups into its chain, as presented herein, and results in new carriers with interesting properties. [17,18] Moreover, the interest in PEG is common for many scientific research areas such as solvent extraction, [26,27] extraction in aqueous biphasic systems, [32 -36] and properties of micellar systems. [37] Our interest in organic phosphates and polyphosphates, including PEG derivatives, is stimulated by previous studies on their application in the liquid membranes.…”

“…[37] Our interest in organic phosphates and polyphosphates, including PEG derivatives, is stimulated by previous studies on their application in the liquid membranes. [17,18,37,38] In this work we continue our studies by experimenting with some new carriers 1-3 listed in Table 1, and PEGs (4) used as the reference compounds. By exploiting the solubility of these compounds both in hydrophobic organic solvent and water, we can also evaluate the possible influence of organic phase hydration.…”

Poly[poly(oxypropylene) phosphate] macroionophores for transport and separation of cations in a hybrid: Cation‐exchange polymer and liquid membrane system

“…This rather evident-to biophysicists-feature of natural systems was the inspiration for our studies, based on the assumption that high selectivity and stability of membrane systems can be attained probably in the multimembrane systems with a hierarchy of processes mimicking bacterial cell envelopes. 15 From the perspective of our previous reports concerning the properties of poly[poly(oxyethylene) phosphate]s 13,26,27,32 as the macroionophores, a natural extension of our studies was to synthesize more hydrophobic polymers such as poly[poly-(oxypropylene) phosphate]s (PPOPPs) and to test them in the pertraction of typical transient (Zn 2ϩ , Cu 2ϩ ), alkali-earth (Ca 2ϩ , Mg 2ϩ ), and alkaline (K uptake from external aqueous solutions into a liquid membrane phase, a continuous dehydration of a liquid membrane by water pervaporation method was additionally applied. According to the scheme of the system operation in Figure 1, the overall membrane system constitutes a set of very different membranes such as: a hydrophobic liquid membrane, hydrophilic polymer cation-exchange, and hydrophilic polymer pervaporation membranes.…”