Interaction of sodium dodecylbenzenesulfonate with chrysotile fibers. Adsorption or catalysis?

  • Fachini A
  • Joekes I
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Sodium dodecylbenzenesulfonate (SDBS) aqueous solutions in contact with chrysotile fibers show a concentration reduction up to 53% (C0=3.0×10-3moll-1, above critical micellar concentration (CMC)) and 90% (C0=0.15×10-3moll-1, below CMC) after 4 h contact with the fibers at room temperature, when air bubbling is used as an oxygen supplier. Adsorption/desorption experiments with 3.0×10-3moll-1solution show that only 6% of the surfactant is recovered after successive washing steps in water. Experiments in open and closed stirred flasks show that the surfactant depletion is lower. In non-aerated systems, pseudo-equilibrium is achieved after 4 h. When air bubbling is used, the amount of SDBS removed keeps rising at least for 24 h. The calculated Gibbs pseudo-surface concentration indicates the formation of 2-10 monolayers onto the chrysotile surface. These results are inconsistent with a solely adsorptive process. One degradation product was identified and quantified (CO2), rendering a turnover number of 1500. A mechanism for a catalytic process is proposed. © 2002 Elsevier Science B.V. All rights reserved.

Author-supplied keywords

  • Chrysotile
  • SDBS
  • Surfactant degradation
  • Wastewater

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  • Adriano Fachini

  • Inés Joekes

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