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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 10, 2009
Accepted September 2, 2009

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Adsorption and desorption of m-xylene vapor on organically modified montmorillonite

Chun-Yong Ryu Sang-Do Yeo^†

Department of Chemical Engineering, Kyungpook National University, Daegu 702-701, Korea

Korean Journal of Chemical Engineering, February 2010, 27(2), 602-608(7), 10.1007/s11814-010-0084-z

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Abstract

m-Xylene vapor was adsorbed to organically modified montmorillonite (organoclay). Hexadecyltrimethylammonium (HDTMA) was used to modify the surface of the clay. In adsorption experiments, the organoclay, along with the non-modified (washed) clay, was used. m-Xylene was adsorbed from a gaseous phase by using a fixed adsorption bed. The adsorption breakthrough curves and the adsorption isotherms were determined at three different temperatures (24, 34, and 44 ℃). The adsorption data were modeled with the BET isotherm equation. It was found that the adsorption isotherms of washed clay exhibited a favorable Type I behavior, which implies that the adsorption capacity is strongly dependent on vapor concentration at low concentration ranges. In regards to the organoclay, isotherms showed a marginally favorable Type II behavior with a reduced adsorption capacity at low concentrations, and exhibited a linear increase at elevated vapor concentrations. The adsorption capacity of both washed clay and organoclay obviously decreased with the temperature. The desorption of m-xylene from the clays was also performed by using pure nitrogen, and the desorption rate constant k was on the order of 10^(-5) min^(-1) for all types of clay.

Keywords

Adsorption HDTMA Montmorillonite Organoclay m-Xylene

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