Preparation and characterization of l-cystine and l-cysteine intercalated layered double hydroxides
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l-cystine and l-cysteine have been intercalated into magnesium–aluminum layered double hydroxide by the methods of coprecipitation and ion-exchange. The structure and composition of the intercalated materials have been characterized by X-ray diffraction (XRD), Fourier transform infrared (FT-IR) spectroscopy and elemental analysis. For l-cysteine intercalated composites, two kinds of well-crystallized materials with different basal spacing were obtained, as a result of the different charge on an ion and orientation of the gallery anions. The schematic models of the intercalation structures were proposed. In addition, the thermal decomposition of l-cystine and l-cysteine intercalated LDHs has been investigated by means of thermogravimetry and differential thermal analysis (TG-DTA).
KeywordsLayered Double Hydroxide Basal Spacing Weight Loss Step Host Layer Monovalent Anion
This project was supported by the National Natural Science Foundation Major International Joint Research Program (Project No.: 20620130108), National Natural Science Foundation of China (Grant No.: 20601001), the Program for New Century Excellent Talents in University (Project No.: NCET-05-121) and the 111 Project (Project No.: B07004).
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