Thermal behavior and decomposition of kaolinite-potassium acetate intercalation composite


Autoria(s): Cheng, Hongfei; Yang, Jing; Liu, Qinfu; Zhang, Zhang; Frost, Ray L.
Data(s)

01/05/2010

Resumo

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.

Formato

application/pdf

Identificador

http://eprints.qut.edu.au/41977/

Publicador

Elsevier BV

Relação

http://eprints.qut.edu.au/41977/1/41977.pdf

DOI:10.1016/j.tca.2010.02.014

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.

Direitos

Copyright 2010 Elsevier

Fonte

Chemistry; Faculty of Science and Technology

Palavras-Chave #030606 Structural Chemistry and Spectroscopy #Kaolinite; Potassium acetate; Intercalation; Thermal behavior; Decomposition
Tipo

Journal Article