Abstract
Irradiation by high power ultrasound in a liquid leads to the formation of cavitation bubbles. It has been proposed that three different reaction site in the cavitation bubbles, i.e., the inside of the cavitation bubbles, the gas-liquid interfacial region of the cavitation bubbles, and the bulk solution are present during the ultrasonic irradiation. The surfactant was accumulated in a relatively high ratio in the interfacial region. The destruction of surfactants occurred by reaction with the hydroxyl radical and also by pyrolysis at high temperature. In this study, we have investigated the influence of pH in solution and the frequency on the sonolysis of surfactants.
