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Title

α-Titanium phosphate intercalated with propylamine: An alternative pathway for efficient europium(III) uptake into layered tetravalent metal phosphates

AuthorsGarcía-Glez, Jorge; Trobajo, Camino ; Khainakov, Sergei ; Amghouz, Z.
KeywordsEuropium
Propylamine
Ion-exchange
Sorption
Intercalation
Titanium phosphate
Issue Date2017
PublisherElsevier
CitationArabian Journal of Chemistry 10(6): 885-894 (2017)
Abstractα-Ti(HPO4)2·H2O (α-TiP) and its propylamine intercalation product, Ti(HPO4)2·2C3H7NH2·H2O (α-TiPPr), have been synthesized and characterized. Later, their sorption capacity for europium(III) was investigated, and this purpose was accomplished by treating α-TiP and α-TiPPr with europium(III) nitrate solutions at different concentrations until the equilibrium is reached. All samples were characterized, among others, by powder X-ray diffraction (PXRD), scanning and transmission electron microscopies (SEM, TEM, STEM-EDX, SAED), thermogravimetric analysis (TGA), and photoluminescence (PL) measurements. The results show that the Eu3+ uptake is limited to surface when α-TiP is used as sorbent. Nevertheless, the Eu-retention is considerably enhanced with α-TiPPr as a consequence of an ion-exchange process into the interlayer space of the layered titanium phosphate (involving propylammonium cations, C3H7NH3+, and hexahydrate europium(III) species, [Eu(H2O)6]3+), and the crystal structure of a hypothetical final product, α-[Eu(H2O)6]2/3Ti(PO4)2·[(H2O)6]1/3, has been proposed by using DFT calculations.
Publisher version (URL)https://doi.org/10.1016/j.arabjc.2016.07.013
URIhttp://hdl.handle.net/10261/173482
Identifiersdoi: 10.1016/j.arabjc.2016.07.013
issn: 1878-5352
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