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Research article - Peer-reviewed, 2015

Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

Polido Legaria, Elizabeth; Topel, Seda Demirel; Kessler, Vadim; Seisenbaeva, Gulaim

Abstract

The binding and release of trivalent rare earth element (REE) cations (Dy3+, Nd3+ and La3+) from solutions by a new fully characterized magnetic nano adsorbent material, consisting of iminodiacetic acid ligand (H(2)IDA) grafted onto SiO2 covered gamma-Fe2O3 nanoparticles, was investigated. The nano adsorbent revealed a slightly higher capacity towards heavier REE and appreciable selectivity, especially on desorption. It was found that the composition of the surface complex was RE3+ : L = 1:1. The complexation of the molecular H(2)IDA with RE3+ in this ratio under non-basic conditions was therefore investigated by X-ray crystallography to produce relevant molecular models. Unexpectedly big differences in coordination numbers and binding mode of IDA along with distinct analogies in packing of the ligand molecules in the obtained 2D-coordination polymer structures provided valuable insights into possible reasons for the observed selectivity.

Keywords

magnetic adsorbents, rare earth elements, nanoparticles, hybrid materials, molecular models

Published in

Dalton Transactions
2015, Volume: 44, number: 3, pages: 1273-1282

      SLU Authors

    • Polido Legaria, Elizabeth

      • The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences
      • Topel, Seda Demirel

        • The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences
        • Kessler, Vadim

          • The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences
          • Seisenbaeva, Gulaim

            • The Department of Chemistry and Biotechnology, Swedish University of Agricultural Sciences

          UKÄ Subject classification

          Materials Chemistry
          Inorganic Chemistry
          Organic Chemistry

          Publication identifier

          DOI: https://doi.org/10.1039/c4dt03096f

          Permanent link to this page (URI)

          https://res.slu.se/id/publ/63439