Abstract
In this presentation, we report influences of concentration of KI and frequency on the rate of sono-oxidation in a CO2-Ar atmosphere. Sonication was performed using an ultrasonic irradiator (Shinka, 200 kHz, 100 W and Honda, 2.4 MHz, 15 W) at 25 ℃. The rate of sono-oxidation was evaluated by KI dosimetry using UV-Vis spectrophotometer (JASCO V-650, measuring wavelength is 355 nm). The rate difference between with and without CO2 in an Ar atmosphere was indicated as Improvement index. The index means the ratio of absorbance in a CO2-Ar atmosphere to that in Ar atmosphere. Sono-oxidation rate of NaI solution increased by introduction of CO2 as same as KI. The Improvement index increased with decreasing KI concentration not only at 200 kHz but also at 2.4 MHz.
