Effect of pH on the Flocculation of SDS Micelles by Al3+ |
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Authors: | P Paton F I Talens-Alesson |
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Institution: | (1) TALENCO Chemical Engineering Consulting, P.O. Box 1035 Hospitalet de Llobregat 08902, Spain e-mail: f_talens@mx3.redestb.es, ES |
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Abstract: | SDS micelles flocculate in the presence of Al3+, creating an aggregate with pollutant-removing properties. The fraction of SDS micelles flocculating depends on the concentrations
of SDS and Al3+. This paper describes how this fraction also changes with pH. There are two reasons for this dependence: a change in pH has
a strong effect in the solution chemistry of Al3+, converting it into the compound Al13O4(OH)24]7+, a strong flocculant, or precipitating it as Al(OH)3; and at low pH protons may compete with Al3+ as binding counter-ions for micelles. An increase in pH allows flocculation of SDS at high concentrations of Al3+, which under unmodified pH does not occur. Micelle flocculates are reported in this work to exist between pH 5 and pH 8,
suggesting the potential use of Adsorptive Micellar Flocculation for the removal of anionic pollutants from waste waters not
necessarily limited to acidic solutions.
Received: 18 August 2000 Accepted: 5 October 2000 |
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Keywords: | AMF Micelle Adsorption Flocculation Dodecyl sulfate |
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