TRANSPORT OF PERRHENATE ANIONS ACROSS PLASTICIZER MEMBRANES WITH BASIC ION CARRIERS

Transport experiments across polymer inclusion membranes (PIMs) are presented. The physical immobilization of trioctylamine (TOA) or methyltrioctylammonium chloride (TOMACl) as the ion carriers and o-nitrophenyl octyl ether as the plasticizer in cellulose triacetate as the support were used to prepare polymer inclusion membranes. The competitive transport of ReO4- ions from nitrate aqueous solutions through a PIM with TOA or TOMACl was investigated. The effect of the pH of the source aqueous phase on ReO4- transport from nitrate solution was studied. The higher efficiency of ReO4-removal was observed with use of the basic carrier. TOMACl. The selectivity of competitive oxoanions transport from the source phase decreases as follows: ReO4-> NO3-> SO42-. This order of permeability correlates well with the energy of transported anions hydration. key words: polymer inclusion membranes, oxoanions, separation, perrhenat