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Title: Zirconium organophosphonates as high capacity, selective lanthanide sorbents
Authors: Veliscek-Carolan, J
Hanley, TL
Luca, V
Keywords: Porous materials
Rare earths
Zirconium phosphates
Phosphonic acids
Issue Date: 29-May-2014
Publisher: Elsevier
Citation: Veliscek-Carolan, J., Hanley, T. L., & Luca, V. (2014). Zirconium organophosphonates as high capacity, selective lanthanide sorbents. Separation and Purification Technology, 129, 150-158. doi:10.1016/j.seppur.2014.03.028
Abstract: Novel and versatile zirconium organophosphonate coordination networks have been developed as sorbent platforms via simple, low-temperature hydrothermal reactions of zirconium propoxide with amino tris(methylene phosphonic acid) (ATMP). The resulting materials exhibited hierarchical porosity and possessed exceptional selectively for lanthanide elements over mono- and divalent metal ions during competitive sorption experiments in 0.1 M HNO3, as well as modest intra-lanthanide selectivity. As such, the present materials have potential as solid phase extractants for lanthanide separations in applications including mining, radioactive waste treatment and environmental remediation. Lanthanide sorption was shown to occur via uncoordinated Psingle bondO groups in the ATMP molecule. The structure, porosity and sorption properties of the coordination network platform could be tuned through varying the molar ratio of phosphorus to zirconium. Interestingly, the sample with the lowest surface area (<2 m2/g) demonstrated the highest sorption capacity. Optimal compositions demonstrated europium sorption with fast kinetics and very high capacities of up to 0.63 g/mg min and 60 mg/g respectively. As such, these highly stable zirconium organophosphonates, prepared from inexpensive precursor chemicals using one-pot methods, perform comparably to costly commercially available polymer resins. © 2014, Elsevier B.V.
Gov't Doc #: 7667
ISSN: 1383-5866
Appears in Collections:Journal Articles

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