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Improved membrane separations by selective chelation of metal ions in aqueous feeds

Authors
Journal
Desalination
0011-9164
Publisher
Elsevier
Publication Date
Volume
24
Identifiers
DOI: 10.1016/s0011-9164(00)88082-0
Disciplines
  • Chemistry

Abstract

Abstract The addition of chelating agents to mixed divalent metal ions feeds significantly affects the transport of these ions through cellulosic and aromatic polyamide membranes. Depending upon the details of feed stoichiometry and pH, chelation can retard metal transport, improve the selectivity of multi-component metal separations or facilitate transport for dialytic separations. Membrane transport results are explained in terms of the inherent stabilities and physicochemical parameters of the metal-ligands. Electroneutrality criteria also contribute to the observed transport of metal ions in the presence of organic chelating agents.

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