NiTi-layered double hydroxide intercalated with β-CD and CM-β-CD: Interaction between the interlayer guests and the laminates

• NiTi NO3--LDH was synthesized by co-precipitation method.
• Two hybrid materials β-CD-LDH and CM-β-CD-LDH were prepared.
• The morphology, microstructure and thermal stability of them were characterized.
• The interaction between the interlayer β-CD/CM-β-CD and the laminates was discussed.
• The intercalation possible mode of β-CD and CM-β-CD were suggested.

β-Cyclodextrin (β-CD) and its derivative carboxymethyl-β-cyclodextrin (CM-β-CD) have been intercalated within the gallery of NiTi-layered double hydroxide (LDH), which was prepared by co-precipitation method in alkaline pH. Powder X-ray diffraction (XRD), scanning electron microscope (SEM), fourier-transform infrared spectroscopy (FT-IR) and thermal gravimetric–differential thermal gravimetric (TG–DTG) have been used to characterize the confined β-CD and CM-β-CD molecules, whereas intercalation mode have been used to probe the interlayer arrangement and orientation of the intercalated species. The results shown that the intercalation product, which was obtained by the exchange between cyclodextrin and NO3- in NiTi-LDH precursor interlayer, had an ordered crystalline structure. They also confirmed that β-CD and CM-β-CD were both inserted into the interlayer along their cavity axes perpendicular and connected with LDH laminates firmly by the chemical action between TiOH and COH.

β-CD and CM-β-CD intercalated into the gallery of LDH with their cavity axes perpendicular to replaced NO3- in the interlayer, and they were connected with the laminates by the dehydration–condensation reaction between COH in them and TiOH in the laminates.Figure optionsDownload as PowerPoint slide