Preparations of organobentonite using nonionic surfactants

Due to hydrophilic environment at its surface, natural bentonite is an ineffective sorbent for nonpolar nonionic organic compounds in water even though it has high surface area. The surface properties of natural bentonite can be greatly modified by simple ion-exchange reactions with large organic ca...

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Bibliographic Details
Published in:Chemosphere (Oxford) 2001-08, Vol.44 (5), p.989-995
Main Author: Shen, Yun-Hwei
Format: Article
Language:English
Subjects:
Adsorption
Aluminum Silicates - chemistry
Applied sciences
Bentonite
Bentonite - chemistry
Cations
Chemical Phenomena
Chemistry, Physical
Clay
Earth sciences
Earth, ocean, space
Engineering and environment geology. Geothermics
Exact sciences and technology
Global environmental pollution
Nonionic surfactants
Organic Chemicals
Organoclays
Pollution
Pollution, environment geology
Surface-Active Agents - chemistry
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Summary:Due to hydrophilic environment at its surface, natural bentonite is an ineffective sorbent for nonpolar nonionic organic compounds in water even though it has high surface area. The surface properties of natural bentonite can be greatly modified by simple ion-exchange reactions with large organic cations (cationic surfactants) and this organobentonite is highly effective in removing nonionic organic compounds from water. Cationic surfactant derived organobentonites have been investigated extensively for a wide variety of environmental applications. In this study, the preparation of organobentonite using nonionic surfactants has been investigated for the first time. Results indicate that nonionic surfactants intercalates into the interlamellar space of bentonite and may demonstrate higher sorption capacity than cationic surfactant. It is possible to create large interlayer spacing and high organic carbon content organobentonite by use of nonionic surfactants with suitable balance between the hydrocarbon and ethylene oxide chain lengths. In addition, nonionic surfactant derived organobentonites are more chemically stable than cationic surfactant derived organobentonites.
ISSN:0045-6535
1879-1298
DOI:10.1016/S0045-6535(00)00564-6