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Issue 3, 2015
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Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

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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 (H2IDA) grafted onto SiO2 covered γ-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 H2IDA 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.

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

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Publication details

The article was received on 08 Oct 2014, accepted on 11 Nov 2014 and first published on 12 Nov 2014


Article type: Paper
DOI: 10.1039/C4DT03096F
Citation: Dalton Trans., 2015,44, 1273-1282
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    Molecular insights into the selective action of a magnetically removable complexone-grafted adsorbent

    E. Polido Legaria, S. D. Topel, V. G. Kessler and G. A. Seisenbaeva, Dalton Trans., 2015, 44, 1273
    DOI: 10.1039/C4DT03096F

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