Thermal behavior and decomposition of kaolinite-potassium acetate intercalation composite
Cheng, Hongfei, Yang, Jing, Liu, Qinfu, Zhang, Zhang, & Frost, Ray L. (2010) Thermal behavior and decomposition of kaolinite-potassium acetate intercalation composite. Thermochimica Acta, 503/4, pp. 16-20.
A series of kaolinite-potassium acetate intercalation composite was prepared. The thermal behavior and decomposition of these composites were investigated by simultaneous differential scanning calorimetry-thermogravimetric analysis (DSC-TGA), X-ray diffraction (XRD) and Fourier-transformation infrared (FT-IR). The XRD pattern at room temperature indicated that intercalation of potassium acetate into kaolinite causes an increase of the basal spacing from 0.718 to 1.428nm. The peak intensity of the expanded phase of the composite decreased with heating above 300°C, and the basal spacing reduced to 1.19nm at 350°C and 0.718nm at 400°C. These were supported by DSC-TGA and FT-IR measurements, where the endothermic reactions are observed between 300 and 600°C. These reactions can be divided into two stages: 1) Removal of the intercalated molecules between 300-400°C. 2) Dehydroxylation of kaolinite between 400-600°C. Significant changes were observed in the infrared bands assigned to outer surface hydroxyl, inner surface hydroxyl, inner hydroxyl and hydrogen bands.
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|Item Type:||Journal Article|
|Additional Information:||This is the work of students Cheng and Yang|
|Keywords:||Kaolinite; Potassium acetate; Intercalation; Thermal behavior; Decomposition|
|Subjects:||Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)|
|Divisions:||Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
|Copyright Owner:||Copyright 2010 Elsevier|
|Deposited On:||15 Jun 2011 23:17|
|Last Modified:||01 Mar 2012 01:29|
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