Synthesis and characterization of a novel layered tin(IV) phosphate with ion exchange properties
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A novel layered tin(IV) phosphate, Sn(NH4PO4)(HPO4)·2H2O (δ-SnP-NH4), was synthesized under mild hydrothermal conditions (190 °C) in the presence of urea. The treatment of this compound with mineral acids gave a new phase of tin(IV) bis(monohydrogenphosphate), Sn(HPO4)2·3H2O (δ-SnP-H). The layered nature of the solid was confirmed from amine intercalation, exfoliation in alkaline media, and the ion exchange behavior towards alkali and alkaline earth ions. High affinity (KdCs to approximately 5×104 to 2×105 mL g-1) and capacity (160-200 mg Cs+ per g of exchanger) for Cs+ makes these materials promising for selective radioactive cesium removal from contaminated groundwater and nuclear waste.
author list (cited authors)
Bortun, A. I., Khainakov, S. A., Bortun, L. N., Jaimez, E., Garcı́a, J. R., & Clearfield, A.