Effect of rehydration on structure and surface properties of thermally treated palygorskite

Liu, Haibo, Chen, Tianhu, Chang, Dongyin, Qing, Chengsong, Kong, Dejun, Chen, Dong, Xie, Jingjing, & Frost, Ray L. (2013) Effect of rehydration on structure and surface properties of thermally treated palygorskite. Journal of Colloid and Interface Science, 393, pp. 87-91.

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Abstract

Palygorskite has a fibrous like morphology with a distinctive layered appearance. The simplified formula of palygorskite (Mg5Si8O20(OH)2(OH2)4 nH2O) indicates that two different types of water are present. The dehydration and rehydration of palygorskite have been studied using thermogravimetry and H2O-tem- perature programmed desorption. X-ray diffractograms, NH3 adsorption profiles, and NH3 desorption profiles were obtained for thermally treated palygorskite as a function of temperature. The results proved water molecules were mainly derived from Si–OH units. In addition, five kinds of acid sites were found for palygorskite. The number of acid sites of external surfaces was larger than that of the internal sur- faces. Bonding on the internal surface acid sites was stronger than the bonding of the external surfaces. Rehydration restored the folded structure of palygorskite when thermal treatment temperature was lower than 300 oC.

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ID Code: 58758
Item Type: Journal Article
Refereed: Yes
Keywords: Sepiolite, Palygorskite, Rehydration, NH3 desorption, Surface properties
DOI: 10.1016/j.jcis.2012.10.062
ISSN: 00219797
Subjects: Australian and New Zealand Standard Research Classification > CHEMICAL SCIENCE (030000) > PHYSICAL CHEMISTRY (INCL. STRUCTURAL) (030600) > Structural Chemistry and Spectroscopy (030606)
Divisions: Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > QUT Faculties and Divisions > Science & Engineering Faculty
Copyright Owner: Copyright 2012 Elsevier Inc.
Copyright Statement: NOTICE: this is the author’s version of a work that was accepted for publication in Journal of Colloid and Interface Science. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Journal of Colloid and Interface Science, Vol. 393, 1 March 2013. http://dx.doi.org/10.1016/j.jcis.2012.10.062
Deposited On: 04 Apr 2013 00:49
Last Modified: 26 Apr 2013 13:34

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