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Use of Inorgano-Organo-Clays in the Removal of Priority Pollutants from Industrial Wastewaters: Structural Aspects

Published online by Cambridge University Press:  02 April 2024

Keeran R. Srinivasan  and
H. Scott Fogler
Keeran R. Srinivasan
Affiliation:
Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109
H. Scott Fogler
Affiliation:
Department of Chemical Engineering, University of Michigan, Ann Arbor, Michigan 48109
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Abstract

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Novel modified clay adsorbents were prepared by blocking cation-exchange sites of an expandable clay, such as montmorillonite, with polymeric or polyvalent inorganic ions and by using cationic surfactants as sources of surface organic carbon. Electrokinetic measurements demonstrated that the adsorbed polycations were essentially nonexchangeable. Adsorption and desorption experiments revealed that about 90% of the cationic surfactant was apparently irreversibly bound to the surface. Flocculation and peptization studies were performed to establish that the adsorbed surfactant moiety was oriented with its hydrocarbon tail towards the surface. Such a configuration of simultaneously adsorbed polycations and cationic surfactants was designated as an inorgano-organo-clay (IOC). As shown in an accompanying paper, these IOCs bind priority pollutants as strongly as granulated activated carbon.

Keywords

AdsorptionChlorophenolsFlocculationHydroxy-AlInorgano-organo claysMontmorillonitePollutants
Type
Research Article
Information
Clays and Clay Minerals , Volume 38 , Issue 3 , June 1990 , pp. 277 - 286
Copyright
Copyright © 1990, The Clay Minerals Society

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