Embedding Alkyldiamine into Layered α‐Titanium Phosphate via Direct‐Ion Exchange and its Application in Eu^III Removal from Water

Abstract

Diamine-pillared α-titanium phosphate (α-TiP) was prepared via direct ion exchange method. Moreover, 1,3-propanediamine, as the pillaring agent, was used to investigate the effect of pH, content and temperature on the interlayer distance of α-TiP. The structure and properties of the samples were characterized by X-ray Diffraction (XRD), Fourier Transform Infrared Spectroscopy (FT-IR), Field Emission Scanning Electron Microscopy (SEM), and Differential Thermal Analysis (TG). The results show that the interlayer distance of α-TiP was enlarged from 7.6 Å to 16.18 Å as the carbon chain of the intercalating diamine increased from (NH 2 (CH 2 ) n NH 2 ) (n = 2 to 7). The layer 399 space structure consists of monomolecular alkyl chains with an average tilt angle of 75.6°. The uptake values for these five alkyldiamine cations were 3.780, 3.261, 2.443, 2.175, and 1.954 mmol, per gram of TiP, respectively. Also, we found that the direct ion exchange method is more effective in a weak acidic environment. The variation of interlayer distance was a consecutive process, and unaffected by temperature. The 1,3-propanediamine intercalation product (α-TiPPda) showed excellent performance towards Eu III adsorption in water with removal efficiencies Ն 99 %. Journal of Inorganic and General ChemistryZeitschrift für anorganische und allgemeine Chemie ARTICLE