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Microstructure of HDTMA+ Modified Montmorillonite and its In-fluence on the Sorption Characteristics

Frost, Ray L., He, Hongping, Xi, Yunfei, Kloprogge, J. Theo, Zhou, Qin, Martens, Wayde N., & Yuan, Peng (2006) Microstructure of HDTMA+ Modified Montmorillonite and its In-fluence on the Sorption Characteristics. Clays and Clay Minerals, 54(6), pp. 689-696.

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Abstract

A series of organoclays with monolayer, bilayer, pseudotrilayer, paraffin monolayer and paraffin bilayer were prepared by ion exchange. The microstructural parameters, including BET-N2 surface area, pore volume, pore size, surfactant loading and distribution, were deter-mined by X-ray diffraction (XRD), N2 adsorption-desorption and high-resolution thermogra-vimetric analysis (HRTG). The results show that both BET-N2 surface area and pore volume decrease from low to high surfactant loading as the average pore size increases. After modify-ing montmorillonite with hexadecyltrimethylammonium bromide (HDTMAB), two basic or-ganoclay models were proposed on the basis of HRTG results: 1) the surfactant mainly occu-pied the clay interlayer and 2) both the clay interlayer space and external surface were modi-fied by surfactant. In the former case, the sorption mechanism of p-nitrophenol to the organo-clay at relative low concentration involves both surface adsorption and partition whereas the latter mainly involves partition. This study demonstrates that the distribution of adsorbed sur-factant and the arrangement of adsorbed HDTMA+ within the clay interlayer control the effi-ciency and mechanism of sorption by the organoclay rather than BET-N2 surface area, pore volume, and pore diameter.

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43 since deposited on 08 Jan 2007
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ID Code: 5962
Item Type: Journal Article
Additional Information: Self-archiving of the author-version is not yet supported by this publisher. For more information, please refer to the journal’s website (see link) or contact the author. Author contact details: r.frost@qut.edu.au
Keywords: Organoclay, BET, N2 surface area, Pore size and volume, Surfactant loading and distribution, Sorption efficiency and mechanism
DOI: 10.1346/CCMN.2006.0540604
ISSN: 1552-8367
Divisions: Past > QUT Faculties & Divisions > Faculty of Science and Technology
Copyright Owner: Copyright 2006 Clay Minerals Society
Deposited On: 08 Jan 2007
Last Modified: 01 Mar 2012 13:49

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