A nanoporous sorbent designed around chelating iminodiacetamide (“IDA-Amide”) moiety was made on mesoporous silica (MCM-41) and evaluated for lanthanide separations (Ce3+, Nd3+, Eu3+, Gd3+, and Lu3+). The effects of solution pH on lanthanide binding were studied, as well as sorption kinetics, and competition from other metal ions. The IDA-Amide SAMMS® demonstrated an interesting difference in the kinetics of sorption of the lanthanide ions in the order of Lu3+ > Eu3+ > Gd3+ > Nd3+ > Ce3+ . The close proximity of the ligands in the IDA-Amide SAMMS® may allow for multiple metal-ligand interactions (“macromolecular chelation”).
Revised: July 19, 2011 |
Published: June 1, 2011
Citation
Fryxell G.E., W. Chouyyok, and R.D. Rutledge. 2011.Design and synthesis of chelating diamide sorbents for the separation of lanthanides.Inorganic Chemistry Communications 14, no. 6:971-974.PNNL-SA-77936.