Abstract:

Glutamic acid(Glu) was intercalated into ZnAl layered double hydroxides(ZnAl-LDH) via the ion-exchange method to form Glu/ZnAl-LDH compounds， and the influence of exchange time on the structure of Glu/ZnAl-LDH was systematically investigated by X-ray diffraction(XRD), Fourier transform infrared spectroscopy(FTIR), transmission electron microscopy(TEM), thermo-gravimetry(TG) and differential thermal analysis(DTA) techniques. It was found that when the exchange time was one day, the crystallinity of Glu/ZnAl-LDH compounds was high and Glu was intercalated vertically into the ZnAl-LDH sheets, and Glu in the layers reached exchange equilibrium at this moment. When the exchange time was 2 days, part of Glu was intercalated horizontally. When the exchange time was further extended, the strucutre of ZnAl-LDH would be partially collapsed. In addition, the hexagonal shape of ZnAl-LDH compounds would be dissolved partially in the acid solution. Furthermore, the thermal stability of Glu would be increased dramatically when Glu was intercalated into ZnAl-LDH compounds, hence, ZnAl-LDH could be used as the excellent carrier and storage of biomaterial.