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N,N’-Bis(salicylidene)ethylenediamine (Salen) as an Active Compound for the Recovery of Ni(II), Cu(II), and Zn(II) Ions from Aqueous Solutions

Faculty of Chemical Technology and Engineering, UTP University of Science and Technology, 3 Seminaryjna, PL 85326 Bydgoszcz, Poland
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Membranes 2020, 10(4), 60; https://doi.org/10.3390/membranes10040060
Received: 5 March 2020 / Revised: 24 March 2020 / Accepted: 31 March 2020 / Published: 2 April 2020
In this paper, three main methods of metal ion separation, i.e., liquid–liquid extraction, transport across polymer inclusion membranes (PIMs), and sorption/desorption, are described. In all of them, N,N’-bis(salicylidene)ethylenediamine (salen) was used as an active compound, i.e., as an extractant or as a carrier for the recovery of Ni(II), Cu(II), or Zn(II) ions from aqueous solutions. In each case, the recovery was performed on a model solution, which contained only a single metal ion. The obtained results were compared with the author’s previous results for the separation of metal ions using β-diketones, since both β-diketones and salen form the so-called Werner-type complexes. Electrospray ionization high-resolution mass spectrometry (ESI-HRMS) was also applied to confirm the ability of the carrier to form complexes with metal ions in a solution. Moreover, spectrophotometry was used to determine the stability constant of the obtained complexes. View Full-Text
Keywords: N,N’-bis(salicylidene)ethylenediamine; salen; metal ions; nickel(II), copper(II), zinc(II), liquid–liquid extraction; polymer inclusion membranes; sorption N,N’-bis(salicylidene)ethylenediamine; salen; metal ions; nickel(II), copper(II), zinc(II), liquid–liquid extraction; polymer inclusion membranes; sorption
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Witt, K.; Bożejewicz, D.; Kaczorowska, M.A. N,N’-Bis(salicylidene)ethylenediamine (Salen) as an Active Compound for the Recovery of Ni(II), Cu(II), and Zn(II) Ions from Aqueous Solutions. Membranes 2020, 10, 60.

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