Preparation and enantiosorption of L-aspartic acid pillared hydrotalcites

L-aspartic acid(Asp)pillared hydrotalcites were prepared by direct reaction of the L-Asp anion with layered double hydroxides(LDHs).The obtained samples were characterized by X-ray diffractometry(XRD),Fourier transform infrared(FTIR),and thermogravimetric and differential thermal analysis(TG/DTA).The results show that the initial interlayer carbonate ions can be completely replaced by the L-Asp anion under the controlled conditions.The pillared hydrotalcites have a crystallized supramolecular structure and thermal stability.The L-Asp pillared LDHs were used in the enantiosorption of enantiopure phenylalanine(Phe),the results suggest that L-Asp pillared LDHs exhibit an excellent enantiosorption capability for D-Phe,and the adsorption isotherm fits Freundlich equation.