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

作者：Garcia Glez Jorge; Trobajo Camino; Khainakov Sergei A; Amghouz Zakariae

来源：Arabian Journal of Chemistry, 2017, 10(6): 885-894.

DOI：10.1016/j.arabjc.2016.07.013

• Titanium phosphate
• Propylamine
• Europium
• Intercalation
• Sorption
• Ion-exchange

alpha-Ti(HPO4)(2)center dot H2O (alpha-TiP) and its propylamine intercalation product, Ti(HPO4)(2)center dot 2C(3)H(7)-NH2 center dot H2O (alpha-TiPPr), have been synthesized and characterized. Later, their sorption capacity for europium(III) was investigated, and this purpose was accomplished by treating alpha-TiP and alpha-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 alpha-TiP is used as sorbent. Nevertheless, the Eu-retention is considerably enhanced with alpha-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, alpha-[Eu(H2O)(6)](2/3)Ti(PO4)(2)center dot[(H2O)(6)](1/3), has been proposed by using DFT calculations.

• 出版日期2017-9