抄録
Most of the organic hazardous substances dissolves readily in the organic solvents. It has been reported that the effect of ultrasonic cavitation is more intense for lower vapor pressure of the solvent. From these points of view, we tried to decompose trichloroethylene in a silicon oil, low-volatile and hydrophobic solvent, in order to find an effective treatment of hazardous substances. Trichloroethylene (10mM) was sonicated with 200 kHz in the 50mL of silicon oil. The decomposition ratio is less than 5% notwithstanding irradiation for 3 hours. Water was added to silicon oil for the formation of OH radical and the stabilization of Cl radical. However, the decomposition ratio did not improve. Trichloroethylene would be affinitive with silicon oil for its high lipophilicity, because its log Pow (Octanol/water partition coefficient) is 2.24. Therefore, trichloroethylene may be hard to vaporize and be pyrolyzed in the cavity. The organic hazardous substance may be decomposed efficiently in the organic solvents to optimize the hydrophobicity and the hydrophilicity of the solvent and the solute.
