Abstract
At temperatures above the “cloud point,” aqueous nonionic surfactant micellar solutions can separate into two phases: a micellar-rich coacervate phase and a dilute phase. Because the coacervate phase is a concentrated micellar solution, organic solute tends to concentrate in the coacervate as a result of solubilization. In this study up to 91% of trichloroethylene (TCE) was extracted into the coacervate phase in one stage. The TCE concentration in the coacervate can be over two orders of magnitude greater than that in the dilute phase. Increasing temperature, surfactant concentration, and added NaCl concentration all improve the fraction of TCE extracted.
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