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Microstructure of organo-bentonites in water and the effect of steric hindrance on the uptake of organic compounds

Published online by Cambridge University Press:  01 January 2024

Jianxi Zhu ,
Lizhong Zhu ,
Runliang Zhu  and
Baoliang Chen
Jianxi Zhu
Affiliation:
Department of Environmental Science, Xixi Campus, Zhejiang University, 148 Tianmushan Street, Hangzhou, Zhejiang 310028, China
Lizhong Zhu*
Affiliation:
Department of Environmental Science, Xixi Campus, Zhejiang University, 148 Tianmushan Street, Hangzhou, Zhejiang 310028, China
Runliang Zhu
Affiliation:
Department of Environmental Science, Xixi Campus, Zhejiang University, 148 Tianmushan Street, Hangzhou, Zhejiang 310028, China
Baoliang Chen
Affiliation:
Department of Environmental Science, Xixi Campus, Zhejiang University, 148 Tianmushan Street, Hangzhou, Zhejiang 310028, China
*
* E-mail address of corresponding author: [email protected]
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Abstract

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To further elucidate adsorption-to-partition transitional mechanisms which have been proposed previously for organo-bentonites with different surfactant loadings, the structural characteristics of interlayer surfactant aggregates on organo-bentonite with different surfactant cetyltrimethylammonium bromide loading levels (0.20–2.56 times cation exchange capacity, CEC) have been investigated by in situ X-ray diffraction (XRD) and Fourier TransformInfrared (FTIR) spectroscopy. The sorption properties and the structure of the clay interlayers changed according to the type of surfactant, the surfactant loading level, and the state of hydration in the clays. Based on the sorption of nitrobenzene, phenol, and aniline to organobentonites, the contaminant sorption coefficients (Ksf), normalized with the organic carbon content, show a remarkable dependence on surfactant loading levels. The Ksf values first increased with surfactant loading until reaching a maximum at 1.0 to 1.2 times the CEC, and then decreased. According to the theoretical calculation of the volume fractions relating to the interlamellar space, the interlamellar microenvironment became a more hydrophobic medium, contributing to the dissolution of organic contaminants, as the surfactant loading increased from 0.20 to 2.56 times the CEC. However, the increase in packing density (ρ) for the intercalates, and induced steric hindrances both affect the result in terms of a reduction in the accessible free space where the organic contaminants can be located, which might be a negative factor in the sorption capacity.

Keywords

Organo-bentoniteMicrostructureSteric Hindrance MechanismsSorption EfficiencySurfactant Loadings
Type
Research Article
Information
Clays and Clay Minerals , Volume 56 , Issue 2 , April 2008 , pp. 144 - 154
Copyright
Copyright © 2008, The Clay Minerals Society

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