Universidade Estadual de Campinas - UNICAMP

Chrysotile As Catalyst for Sodium Dodecylbenzenesulfonate Degradation. Effect of Surfactant Concentration Above C.M.C.

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Previous results showed that the aromatic ring of sodium dodecylbenzenesulfonate (SDBS) is degraded in the presence of chrysotile. We followed the degradation in concentrated SDBS aqueous solutions (3.0x10 -3 mol L -1 ) at 25 and 40 ºC. The turnover number (TON) of the reactions was calculated. Reductions in the surfactant concentration of 57.0% (TON=663) at 25 o C and of 40.0% (TON=409) at 40 o C were observed. A sample of chrysotile was used in sequential degradation reactions, showing a reduction of 15% (TON=750) in the SDBS concentration, after 4 cycles. The Infrared spectra of SDBS solutions dried after reaction with chrysotile showed no surfactant absorption bands.

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