Details

Autor(en) / Beteiligte

• Polido Legaria, E
• Saldan, I
• Svedlindh, P
• Wetterskog, E
• Gunnarsson, K
• Kessler, V. G
• Seisenbaeva, G. A

Titel

Coordination of rare earth element cations on the surface of silica-derived nanoadsorbentsElectronic supplementary information (ESI) available: TEM-EDS mapping of REE deposited onto particles, XPD of the particles produced at elevated pH, and details of zeta-potential measurements. CCDC 1543666. For ESI and crystallographic data in CIF or other electronic format see DOI: 10.1039/c7dt04388k

Erscheinungsjahr

2018-01

Link zum Volltext

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Silica (SiO 2 )-derived nanoadsorbents are a powerful and attractive tool for the extraction and separation of rare earth elements (REE) from many perspectives such as reusability, efficiency and minimum impact on the environment. In the present work, we investigated two different methods of adsorption down to the molecular level: (1) the mechanism of the coordination of different groups of REE (light, medium, heavy) with iminodiacetic acid (IDA) was revealed by exploiting models obtained from X-ray crystallography, explaining the selectivity of this type of ligand, and (2) the mechanism of the seeding of RE(OH) 3 initiated by SiO 2 -based nanoadsorbents was investigated by EXAFS, both individually and in combination with mechanism (1), showing the coexistence of both mechanisms. The REE loaded nanoadsorbents possess a high magnetic susceptibility. This property was studied by magnetometry to quantify the REE adsorption efficiency and compared with the values obtained from complexometry. The coordination of REE cations adsorbed on the surface of non-functionalized and complexone-functionalized silica particles was revealed by EXAFS spectroscopy and magnetic studies using X-ray single crystal models as a reference.