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.
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.
Impact and interest:
Citation countsare sourced monthly fromand citation databases.
These databases contain citations from different subsets of available publications and different time periods and thus the citation count from each is usually different. Some works are not in either database and no count is displayed. Scopus includes citations from articles published in 1996 onwards, and Web of Science® generally from 1980 onwards.
Citations counts from theindexing service can be viewed at the linked Google Scholar™ search.
Full-text downloadsdisplays the total number of times this work’s files (e.g., a PDF) have been downloaded from QUT ePrints as well as the number of downloads in the previous 365 days. The count includes downloads for all files if a work has more than one.
|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: firstname.lastname@example.org|
|Keywords:||Organoclay, BET, N2 surface area, Pore size and volume, Surfactant loading and distribution, Sorption efficiency and mechanism|
|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|
Repository Staff Only: item control page