Abstract
Cellulose triacetate membranes doped with organo-phosphoric carriers (2-ethylhexyl) phosphoric acid noted (D2EHPA) or trioctyl phosphine oxide noted (TOPO) as fixed carriers and 2-nitro phenyl octyl ether noted (NPOE) or tris ethylhexyl phosphate noted (TEHP) as a plasticizers have been prepared and applied for investigation to the facilitated transport of Pb(II) and Cd(II) ions from aqueous nitrate source phase. The membranes Polymer-Plasticizer- Carrier were characterised using chemical techniques as well as Fourier Transform Infra-Red (FTIR), X-ray Diffraction and Scanning electron microscopy (SEM). A study of the transport across a polymer inclusion membrane has shown that the lead or cadmium transport efficiency was increased using D2EHPA as carrier at pH 1-2.
Highlights
Liquid membranes have received considerable attention by many researchers because of their high selectivity accomplished by carriers incorporated in the membranes
Cellulose triacetate membranes doped with organo-phosphoric carriers (2-ethylhexyl) phosphoric acid noted (D2EHPA) or trioctyl phosphine oxide noted (TOPO) as fixed carriers and 2-nitro phenyl octyl ether noted (NPOE) or tris ethylhexyl phosphate noted (TEHP) as a plasticizers have been prepared and applied for investigation to the facilitated transport of Pb(II) and Cd(II) ions from aqueous nitrate source phase
We have developed a novel class of plasticized cellulose triacetate membranes modified by organo-phosphoric carrier’s incorporation that are selectively permeable to lead and cadmium cations
Summary
Liquid membranes have received considerable attention by many researchers because of their high selectivity accomplished by carriers incorporated in the membranes. A novel type of liquid membrane called polymer inclusion membrane (PIM) has been developed which provides metal ion transport with high selectivity, as well as easy setup and operation [8]. Triacetate Membrane Mediated by D2EHPA and TOPO membranes has resulted in good selectivity in ions separations with real improvements of the membrane stability as compared to liquid membranes as well as polymer stabilized liquid membranes. This is reflected by an increasing number of PIM investigations reported in the literature over the last two decades [20,21]. We compared the behaviour of a Di (2-ethylhexyl) Phosphoric acid noted D2EHPA (Acid-type carrier) and a Trioctylphosphine oxide noted TOPO (solvating-type carrier) towards a facilitated transport of lead and cadmium through a synthesized membrane
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