Ion exchange of different phosphate ions into the zinc–aluminium–chloride layered double hydroxide

Abstract

A well-crystallised [Zn–Al–Cl] layered double hydroxide was prepared by coprecipitation at constant pH. The chloride ion of this solid was then exchanged in solution with a series of phosphate ions having different sizes and charges; namely, PO 3 −, H 2PO 4 −, HPO 4 2−, PO 4 3−, P 2O 7 4− and P 3O 10 5−. Powder X-ray diffraction and Fourier transform infrared spectroscopy have allowed a correlation to be made of the structural features of the precursor and the exchanged materials.