Thermal behavior analysis of kaolinite–dimethylsulfoxide intercalation complex

摘要

The thermal behavior of kaolinite–dimethylsulfoxide intercalation complex was investigated by thermogravimetry (TG) and differential scanning calorimetry (DSC) analysis, X-ray diffraction (XRD) analysis, and Fourier-transform infrared (FT-IR) spectroscopic analysis. The samples gradually heated up to different temperatures were studied by XRD and FT-IR. The kaolinite–dimethylsulfoxide intercalation complex is stable below 130 °C. With the rise in the temperature, the relative intensity of the 1.124-nm peak gradually decreased and disappeared at 200 °C, however, the intensity of the 0.714 nm peak increased in the XRD patterns. In the infrared spectra, the appearance of methyl bands at 3018, 2934, 1428, and 1318 cm−1 indicates the presence of intercalated dimethylsulfoxide, the intensities of these bands decreased with the temperature rising and remained until around 175 °C, which agree with the XRD and TG–DSC data.