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首页> 外文期刊>The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical >Effect of ultrasound frequency on pulsed sonolytic degradation of octylbenzene sulfonic acid
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Effect of ultrasound frequency on pulsed sonolytic degradation of octylbenzene sulfonic acid

机译：超声频率对脉冲超声降解辛基苯磺酸的影响

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摘要

It has been shown that pulsed, ultrasound can influence the amount of surfactant that can adsorb to and decompose at the surface of cavitation bubbles. However, the effect of ultrasound frequency on this process has not been considered. The current study investigates the effect of ultrasound frequency on the pulsed sonolytic degradation of octyl benzenesulfonate (OBS). Furthermore, the effect of pulsing and ultrasound frequency on the rate of (OH)-O-center dot radical formation was determined. OBS degradation rates were compared to the rates of (OH)-O-center dot radical formation. In this way, conclusions were made-regarding the relative importance of accumulation of OBS at cavitation bubble surfaces versus sonochemical activity to the sonochemical decomposition of OBS under different conditions of sonolysis. Comparisons of the data in this way indicate that sonolytic degradation of OBS depends on both the sonochemical activity (i.e., (OH)-O-center dot yield) and the accumulation of OBS on cavitation bubble surfaces. However, under a certain set of pulsing and ultrasound frequency exposure conditions, enhanced accumulation of OBS at the gas/solution interface of cavitation bubbles is the sole mechanism of enhanced degradation due to pulsing. On the basis of this finding, conclusions on how pulsing at various ultrasound frequencies affects cavitation bubbles were made.
机译：已经表明，脉冲超声可以影响可吸附到空化气泡表面并在其上分解的表面活性剂的量。但是，尚未考虑超声频率对此过程的影响。当前的研究调查了超声频率对苯磺酸辛酯（OBS）的脉冲声降解的影响。此外，确定了脉冲和超声频率对（OH）-O-中心点自由基形成速率的影响。将OBS降解速率与（OH）-O-中心点自由基形成速率进行了比较。以这种方式，得出结论：在不同的声分解条件下，OBS在空化气泡表面的积累相对于声化学活性对OBS声化学分解的相对重要性。以这种方式进行的数据比较表明，OBS的声分解降解取决于声化学活性（即（OH）-O-中心点产率）和空化气泡表面上OBS的积累。但是，在一定的脉冲和超声频率暴露条件下，OBS在空化气泡的气体/溶液界面处的积累增加是由于脉冲导致降解增强的唯一机制。基于该发现，得出了关于在各种超声频率下的脉冲如何影响空化气泡的结论。

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