Thermal analysis and infrared emission spectroscopic study of halloysite-potassium acetate intercalation compound

Frost, Ray L., Yang, Jing, Cheng, Hongfei, Liu, Qinfu, & Zhang, Jinshan (2010) Thermal analysis and infrared emission spectroscopic study of halloysite-potassium acetate intercalation compound. Thermochimica Acta, 511(1-2), pp. 124-128.

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The thermal decomposition of halloysite-potassium acetate intercalation compound was investigated by thermogravimetric analysis and infrared emission spectroscopy. The X-ray diffraction patterns indicated that intercalation of potassium acetate into halloysite caused an increase of the basal spacing from 1.00 to 1.41 nm. The thermogravimetry results show that the mass losses of intercalation the compound occur in main three main steps, which correspond to (a) the loss of adsorbed water (b) the loss of coordination water and (c) the loss of potassium acetate and dehydroxylation. The temperature of dehydroxylation and dehydration of halloysite is decreased about 100 °C. The infrared emission spectra clearly show the decomposition and dehydroxylation of the halloysite intercalation compound when the temperature is raised. The dehydration of the intercalation compound is followed by the loss of intensity of the stretching vibration bands at region 3600-3200 cm-1. Dehydroxylation is followed by the decrease in intensity in the bands between 3695 and 3620 cm-1. Dehydration was completed by 300 °C and partial dehydroxylation by 350 °C. The inner hydroxyl group remained until around 500 °C.

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ID Code: 38383
Item Type: Journal Article
Refereed: Yes
Keywords: Halloysite, Potassium acetate, Intercalation compound, Thermogravimetry, Infrared emission spectroscopy
DOI: 10.1016/j.tca.2010.08.003
ISSN: 0040-6031
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > ANALYTICAL CHEMISTRY (030100) > Analytical Chemistry not elsewhere classified (030199)
Divisions: Past > Schools > Chemistry
Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2010 Elsevier
Deposited On: 09 Nov 2010 22:01
Last Modified: 29 Feb 2012 14:20

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