Aluminium ions at polyelectrolyte interfaces. III. Role in polyacrylic acid/aluminium oxide and humic acid/kaolinite aggregate cohesion |
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Authors: | E Pefferkorn E Ringenbach F Elfarissi |
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Institution: | (1) Institut Charles Sadron 6 rue Boussingault 67083 Strasbourg Cédex, France, FR |
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Abstract: | Understanding the formation and breakup of humic acids and clays agglomerates is a difficult challenge owing to their complex
nature. Thus, to progress in the study of the stability of such systems, attempts were made to replace the humic acid/kaolinite
natural system by the polyacrylic acid/aluminium oxide synthetic system. Since the present investigation was dedicated to
determine some characteristics of acidic soils which contain traces of aluminium ions, these ions were added to the adsorbent/polyacid
systems as trace constituents. Initial and short-term phenomena related to the adsorption of humic and polyacrylic acids on
aluminium oxide and kaolinite clay have been presented elsewhere. Here we present long-term phenomena regarding the formation
and cohesion of oxide and clay aggregates formed in the presence of polyacrylic and humic acids, respectively. The results
of electrophoretic mobility measurements demonstrated the amphipathic character of polymeric layers adsorbed on aluminium
oxide and the amphoteric character of humic acid layers adsorbed on kaolinite. The long-term stability of the two colloidal
systems was determined to evolve similarly despite the existence of the these typical characteristics.
Received: 24 July 2000 Accepted: 20 December 2000 |
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Keywords: | Cohesion of polyacrylic acid/oxide complexes Cohesion of humic acid/kaolinite complexes Amphipatic polymer layer Amphoteric polyelectrolyte layer |
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