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Pulsed Corona Discharge Induced Hydroxyl Radical Transfer Through the Gas-Liquid Interface

机译:脉冲电晕放电引起的通过气-液界面的羟自由基转移

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摘要

The highly energetic electrons in non-thermal plasma generated by gas phase pulsed corona discharge (PCD) produce hydroxyl (OH) radicals via collision reactions with water molecules. Previous work has established that OH radicals are formed at the plasma-liquid interface, making it an important location for the oxidation of aqueous pollutants. Here, by contacting water as aerosol with PCD plasma, it is shown that OH radicals are produced on the gas side of the interface, and not in the liquid phase. It is also demonstrated that the gas-liquid interfacial boundary poses a barrier for the OH radicals, one they need to cross for reactive affinity with dissolved components, and that this process requires a gaseous atomic H scavenger. For gaseous oxidation, a scavenger, oxygen in common cases, is an advantage but not a requirement. OH radical efficiency in liquid phase reactions is strongly temperature dependent as radical termination reaction rates increase with temperature.
机译:气相脉冲电晕放电(PCD)产生的非热等离子体中的高能电子通过与水分子的碰撞反应产生羟基(OH)自由基。先前的工作已经确定,在等离子体-液体界面处会形成OH自由基,这使其成为氧化水性污染物的重要场所。在此,通过使作为气溶胶的水与PCD等离子体接触,显示出OH自由基在界面的气体侧而不是液相中产生。还证明了气-液界面边界对OH自由基构成了障碍,一个OH自由基需要穿越它们以与溶解的组分发生反应性亲和力,并且该过程需要一种气态原子H清除剂。对于气态氧化,清除剂(通常是氧气)是一种优势,但不是必需的。液相反应中的OH自由基效率在很大程度上取决于温度,因为自由基终止反应速率会随温度的升高而增加。

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