Kinetics and mechanism of the sonolytic degradation of chlorinated hydrocarbons: Frequency effects
- California Inst. of Tech., Pasadena, CA (United States). W.M. Keck Labs.
Ultrasound has been used for a wide variety of biological, physical, and chemical applications. For example, chlorinated hydrocarbons, which are often used as industrial degreasing agents, are readily degraded to inorganic products during aqueous-phase ultrasonic irradiation. The kinetics of the sonolytic degradation of aqueous solutions of carbon tetrachloride and hexachloroethane (C{sub 2}Cl{sub 6}) were investigated at six different frequencies over the range from 20 to 1078 kHz. The rates of degradation of CCl{sub 4} and C{sub 2}Cl{sub 6} were shown to increase with increasing frequency with optimal degradation rates at 500 kHz. At 205 kHz, the relative rates of sonolytic degradation of the three chlorinated methanes followed the order of CCl{sub 4} > CHCl{sub 3} > CH{sub 2}Cl{sub 2}. Hexachloroethane, which was formed as the primary intermediate in the degradation of CCl{sub 4}, was degraded at a rate comparable to that of CCl{sub 4} at all six frequencies.
- Sponsoring Organization:
- Office of Naval Research, Washington, DC (United States); USDOE, Washington, DC (United States)
- OSTI ID:
- 347509
- Journal Information:
- Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory, Vol. 103, Issue 15; Other Information: PBD: 15 Apr 1999
- Country of Publication:
- United States
- Language:
- English
Similar Records
Kinetics and mechanism of the sonolytic destruction of methyl tert-butyl ether by ultrasonic irradiation in the presence of ozone
Homogeneous hydrolysis rate constants for selected chlorinated methanes, ethanes, ethenes, and propanes