Transport and separation properties of poly(oxypropylene) bisphosphates as macroionophores of alkali, alkaline-earth and transient metal cations in a hybrid liquid membrane system
| Autor: | Grzegorz Łapienis, Marek Świątkowski, Romuald Wódzki |
|---|---|
| Rok vydání: | 2005 |
| Předmět: |
Alkaline earth metal
Polymers and Plastics Chemistry General Chemical Engineering Inorganic chemistry Ionophore Synthetic membrane General Chemistry Alkali metal Biochemistry Metal Membrane visual_art Materials Chemistry visual_art.visual_art_medium Environmental Chemistry Qualitative inorganic analysis Ion transporter |
| Zdroj: | Reactive and Functional Polymers. 62:195-208 |
| ISSN: | 1381-5148 |
| DOI: | 10.1016/j.reactfunctpolym.2004.11.001 |
| Popis: | Poly(oxypropylene) bisphosphates (POPBPs) have been synthesized by modification of polypropylene glycols (PPG400, 1200, 2000) and used as macroionophores of metal cations in a multimembrane hybrid system comprising a flowing liquid membrane unit, cation exchange, and pervaporation polymer membranes. POPBPs ability to mediate the selective pertraction of some cations from a multication mixture containing alkali (K + , Na + ), alkaline earth (Ca 2+ , Mg 2+ ) and transient metal cations (Zn 2+ , Cu 2+ ) has been studied and compared with the properties of respective PPGs. POPBPs, after dissolving in 1,2-dichloroethane (liquid membrane phase), have been observed to transport and separate cations in the following order: Zn 2+ > Cu 2+ ≫ Ca 2+ , Mg 2+ , K + , Na + . An increase in the molecular mass of POP chain changes the position of K + cations in the order from Zn 2+ > Cu 2+ > K + ⩾ Na + , Ca 2+ > Mg 2+ to Zn + , K + > Na + > Ca 2+ > Cu 2+ , Mg 2+ as observed for PPG400 and PPG2000, respectively. High ionic fluxes and separation properties of POPBs are dependent mainly on the presence of ionisable phosphoric acid end-groups. These groups, in cooperation with poly(oxypropylene) chains, mediate the proton-coupled transport of cations (counter-transport) resulting in the effective up-hill transport of Zn 2+ cations. |
| Databáze: | OpenAIRE |
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