Acidic organophosphorus extractants—IV

́k, Z. Kolarˇi; Hejná, J.; Moravec, A.

doi:10.1016/0022-1902(67)80371-3

Cited by 13 publications

(1 citation statement)

References 7 publications

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“…The lower extent of extraction for DEHP has been observed in comparative studies with di-n-octyl phosphate, with very similar results obtained. 45 The extraction ability of the IPN prepared from 1 M DUP solution with polystyrene beads was determined and compared with results obtained from the unpolymerized PAE (1 M DUP in polystyrene), as well as the 1 M DEHP/PAE. A 1-L solution of 0.01 N Hg(N03)2 was passed through a given weight of each polymer with a 1-h elution time and the amount Hg(II) absorbed determined from analysis of the effluent.…”

Section: Resultsmentioning

confidence: 99%

Synthesis of interpenetrating polymer networks as metal ion complexing agents

Alexandratos¹,

Strand²

1986

Macromolecules

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The synthesis of an interpenetrating polymer network (IPN) comprised of aliphatic polymers with metal ion complexing ligands within an inert support network is presented. Conditions are defined that permit a maximum entanglement for minimum loss of the polymer from its support network upon continuous elution conditions. The synthesis of the polymerizable metal ion extractant diundecenyl phosphate (DUP) is detailed as well as its incorporation as a toluene solution at a given concentration into macroporous polystyrene beads. The performance of the system after polymerization to give the IPN is compared to that of an unpolymerized control wherein the DUP/toluene solution is simply absorbed into the network (polymer-absorbed extractant, PAE) and to the analogous polymer-trapped extractant (PTE) in which the styrene is polymerized around the extractant. With 50% aqueous ethanol as the eluting solvent, 0.5 M DUP was determined to be the critical entanglement concentration, i.e., the minimum concentration of polymerizable extractant that permits a degree of polymerization high enough so that disentanglement from the support is noticeably hindered relative to the unpolymerized PAE control. Under conditions where the IPN loses 30 % of its extractant, the PAE loses 60% and the comparable PTE loses 71%. Evidence is presented that the key variable in determining monomeric extractant loss is the porosity of the support network, with porosities over 60 vol % losing more than 90% of their extractant. The PTE syntheses show that the extractant acts like a diluent during the formation of the polystyrene chains, leading to high degrees of porosity and, hence, large extractant loss rates. While the DUP/IPN and DUP/PAE absorb fewer mercury ions from aqueous solutions than a DUP/toluene solution, probably due to a loss in extractant ligand mobility within a polymer network, both still perform as well as the PAE made from the conventional liquid extractant bis(2-ethylhexyl) phosphate. Extension of this research into membrane supports is proposed.

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Section: Resultsmentioning

confidence: 99%