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

Sammanfattning

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.

Nyckelord

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

Publicerad i

Dalton Transactions
2015, volym: 44, nummer: 3, sidor: 1273-1282

SLU författare

• Polido Legaria, Elizabeth

  • Institutionen för kemi och bioteknologi, Sveriges lantbruksuniversitet
    

• Topel, Seda Demirel

  • Institutionen för kemi och bioteknologi, Sveriges lantbruksuniversitet
    

• Kessler, Vadim

  • Institutionen för kemi och bioteknologi, Sveriges lantbruksuniversitet
    

• Seisenbaeva, Gulaim

  • Institutionen för kemi och bioteknologi, Sveriges lantbruksuniversitet
    

UKÄ forskningsämne

Materialkemi
Oorganisk kemi
Organisk kemi

Publikationens identifierare

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

Permanent länk till denna sida (URI)

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