当前位置: X-MOL 学术Ultrason. Sonochem. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Mechanism of improving the rate of sono-oxidation of a KI solution by introduction of CO2 into an Ar atmosphere
Ultrasonics Sonochemistry ( IF 8.7 ) Pub Date : 2018-10-26 , DOI: 10.1016/j.ultsonch.2018.10.033
Yuki Ono , Kiyoaki Shinashi , Hisashi Tanaka , Hisashi Harada

The rate of sono-oxidation of KI increased in a CO2-Ar system compared to Ar alone. Higher values were obtained at 200 kHz with a maximum ratio of about forty. To determine the role of additional CO2 in the system, the effect of the pH of the reactant solution, the additional effect of NaHCO3, sonoluminescence, and an analysis of products were examined. It appeared that the pH was not a significant contributor to the acceleration of sono-oxidation activity although the rate depended on the pH. On the other hand, in spite of the alkaline solution, the reaction rate in NaHCO3-KI solution was higher than that in the solution without NaHCO3. This behavior was similar to the case of introduction of CO2, implying the possible evolution of CO2 from NaHCO3. Our data suggested that CO2 reacted with H radicals, which were produced together with OH radicals during sonication and a considerable amount of OH radicals remained. Because OH radicals have strong oxidative power, the level of sono-oxidation activity increases.



中文翻译:

通过向Ar气氛中引入CO 2来提高KI溶液的声氧化速率的机理

与单独的Ar相比,CO 2 -Ar系统中KI的声氧化速率增加。在200 kHz时可获得更高的值,最大比例约为40。为了确定额外的CO 2在系统中的作用,检查了反应物溶液的pH值,NaHCO 3的额外作用,声致发光以及产物分析。尽管速率取决于pH,但看来pH并不是促进声氧化活性的重要因素。另一方面,尽管是碱性溶液,在NaHCO 3 -KI溶液中的反应速率仍高于没有NaHCO 3的溶液中的反应速率。此行为类似于引入CO的情况2,暗示可能从NaHCO 3放出CO 2。我们的数据表明,CO 2与H自由基发生反应,而H自由基在超声处理过程中与OH自由基一起产生,并且残留了大量的OH自由基。因为OH自由基具有很强的氧化能力,所以声音氧化活性的水平会提高。

更新日期:2019-03-12
down
wechat
bug