Abstract
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.
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