In this study, three isomers of hydroxypyridinones, 1,2-HOPO, 3,2-HOPO, and 3,4-HOPO, were attached to self-assembled monolayers on mesoporous silica. (SAMMS). The HOPO-SAMMS materials have superior solid adsorbents properties: they do not suffer from solvent swelling, their rigid, open pore structure allow rapid sorption kinetics, their extremely high surface area enables the installation of high functional density, and being silica-based they are compatible with vitrification into a final glasseous waste form. Kinetics, equilibrium, and selectivity of the adsorptions of actinide on the HOPO-SAMMS at various pHs, and in the presences of other metal cations, anions and competing ligands are reported. Rapid sequestration of U (VI), Np (V) and Pu (IV) was observed. Very little competition from transition metal cations and common species was observed.
Revised: January 27, 2012 |
Published: March 1, 2005
Citation
Lin Y., S.K. Fiskum, W. Yantasee, H. Wu, S.V. Mattigod, E.R. Vorpagel, and G.E. Fryxell, et al. 2005.Incorporation of Hydroxypyridinone (HOPO) Ligands into Self-Assembled Monolayers on Mesoporous Supports for Selective Actinide Sequestration.Environmental Science & Technology 39, no. 5:1332-1337.PNNL-SA-41880.doi:10.1021/es049169t