P14 アルキルベンゼンスルホン酸の超音波分解とキャビテーションバブル界面の速度論解析(第II部,ポスター発表)

概要

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Sonolysis of alkylbenzene sulfonate (LAS C8, LAS C9, LAS C12) was performed to obtain detailed information on the interfacial region of cavitation bubbles, because LASs are decomposed mainly in this region. In this study, a Langmuir type mechanism was applied, because heterogeneous reactions are induced by ultrasonic irradiation. The initial concentrations of LASs were varied from 15 μM to 2000 μM to analyze the reaction kinetics. In the case of low concentrations of LASs (15-40 μM), the order of degradation rate was LAS C_8>LAS C_9>LAS C_<12>. This order is suggested to be due to diffusion controlled degradation. Though the degradation rates increased with increasing initial LAS concentration, inflection points were observed at around 40-100 μM for all LASs. The result obtained was reasonably well explained with a Langmuir type mechanism. For high concentrations of LASs (100-2000 μM), the same mechanism could not be applied to explain the results. The yields of H_2O_2 in the presence of LASs were also measured as a function of LAS concentration. It was found that the curve of H_2O_2 yield vs. LAS concentration had an inflection point at around 40 μM for all LASs. From these results, it is suggested that the physicochemical properties in the interfacial region of cavitation bubbles were different in the low and high LAS concentration regimes.
日本ソノケミストリー学会の論文
2008-12-05