Effect of Ultrasound Frequency on Pulsed Sonolytic Degradation of Octylbenzene Sulfonic Acid
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- 作者：Limei Yang ; Joe Z. Sostaric ; James F. Rathman ; Linda K. Weavers
- 刊名：Journal of Physical Chemistry B
- 出版年：2008
- 出版时间：January 24, 2008
- 年：2008
- 卷：112
- 期：3
- 页码：852 - 858
- 全文大小：126K
- 年卷期：v.112,no.3(January 24, 2008)
- ISSN：1520-5207
文摘
It has been shown that pulsed ultrasound can influence the amount of surfactant that can adsorb to anddecompose at the surface of cavitation bubbles. However, the effect of ultrasound frequency on this processhas not been considered. The current study investigates the effect of ultrasound frequency on the pulsedsonolytic degradation of octyl benzenesulfonate (OBS). Furthermore, the effect of pulsing and ultrasoundfrequency on the rate of 
OH radical formation was determined. OBS degradation rates were compared to therates of OH radical formation. In this way, conclusions were made regarding the relative importance ofaccumulation of OBS at cavitation bubble surfaces versus sonochemical activity to the sonochemicaldecomposition of OBS under different conditions of sonolysis. Comparisons of the data in this way indicatethat sonolytic degradation of OBS depends on both the sonochemical activity (i.e., OH yield) and theaccumulation of OBS on cavitation bubble surfaces. However, under a certain set of pulsing and ultrasoundfrequency exposure conditions, enhanced accumulation of OBS at the gas/solution interface of cavitationbubbles is the sole mechanism of enhanced degradation due to pulsing. On the basis of this finding, conclusionson how pulsing at various ultrasound frequencies affects cavitation bubbles were made.
OH radical formation was determined. OBS degradation rates were compared to therates of OH radical formation. In this way, conclusions were made regarding the relative importance ofaccumulation of OBS at cavitation bubble surfaces versus sonochemical activity to the sonochemicaldecomposition of OBS under different conditions of sonolysis. Comparisons of the data in this way indicatethat sonolytic degradation of OBS depends on both the sonochemical activity (i.e., OH yield) and theaccumulation of OBS on cavitation bubble surfaces. However, under a certain set of pulsing and ultrasoundfrequency exposure conditions, enhanced accumulation of OBS at the gas/solution interface of cavitationbubbles is the sole mechanism of enhanced degradation due to pulsing. On the basis of this finding, conclusionson how pulsing at various ultrasound frequencies affects cavitation bubbles were made.