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