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

Arabian Journal of Chemistry

Jorge García-Glez¹  Camino Trobajo¹  Zakariae Amghouz²  Sergei A. Khainakov² 

[1] Department of Organic and Inorganic Chemistry, University of Oviedo-CINN, 33006 Oviedo, Spain;Scientific and Technical Services, University of Oviedo-CINN, 33006 Oviedo, Spain;

关键词: Titanium phosphate;    Propylamine;    Europium;    Intercalation;    Sorption;    Ion-exchange;   

DOI  :  10.1016/j.arabjc.2016.07.013

来源: DOAJ

【 摘 要 】

α-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.

【 授权许可】

Unknown