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  • bentonite  (1)
  • 1980-1984  (1)
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  • 1980-1984  (1)
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  • 1
    ISSN: 1435-1536
    Keywords: Polyelectrolyte ; bentonite ; flocculation ; adsorption
    Source: Springer Online Journal Archives 1860-2000
    Topics: Chemistry and Pharmacology , Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
    Description / Table of Contents: Abstract The interactions between tert-ammonium type cationic polyelectrolyte, the polycondensate of ethanolamine and epichlorohydrine (PEE), and bentonite particules in dilute aqueous suspensions are studied in the light of adsorption and flocculation. The extents of both phenomena are significantly influenced by the ionic strength of the medium. The adsorption of PEE on the bentonite particles occurs initially at the sites occupied by the hydrogen ions as counterion and then at the sites previously occupied by calcium ions. As flocculation mechanisms, charge neutralization appears to be principal one whereas polymer bridging effect becomes important only when the ionic strength is significant.
    Notes: Résumé Les intéractions entre un polyélectrolyte cationique de type ammonium tertiaire PEE(polycondensat d'éthanolamine et d'épichlorhydrine) et une suspension aqueuse de bentonite ont été étudiées sous l'angle des phénomènes d'adsorption et de floculation. L'importance de ces deux phénomènes est fortement influencée par la force ionique du milieu. L'adsorption du PEE sur les particules de bentonite se situe d'abord sur les sites occupés par les ions hydrogène comme les ions opposés et ensuite sur les sites occupés par les ions calcium. La neutralisation de charge semble être le principal mécanisme de floculation tandis que l'effet du pontage interparticulaire du polyélectrolyte ne devient notable que pour des forces ioniques du milieu importantes.
    Type of Medium: Electronic Resource
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