Over the last two decades, atmospheric-pressure plasma has been investigated intensively as an advanced oxidation process for water. This current study is to focus on the generation mechanisms of H2O2 in the liquid treated by atmospheric-pressure He plasma. The effect of H2O2(aq) on the removal percentage of isopropanol (IPA) in liquid is evaluated after He plasma jet treatment. The effects of IPA as ·OH(g) and ·OH(aq) scavenger on the generation of H2O2(aq) are studied by changing the initial IPA solution temperature. Our analysis indicates that H2O2(aq) is mainly formed by the H2O2(g) dissolution into liquid. The combination of ·OH(aq) is not important for the formation of H2O2(aq) in liquid. When the exogenous H2O2 is added into IPA solution, the IPA removal percentage can be improved by the He plasma jet treatment due to the fact that exogenous H2O2 is decomposed to ·OH by e−, H radicals, and He and He2 metastables. This study is important for understanding the reaction pathways of H2O2(aq) in plasma treated liquid.

中文翻译：

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H2O2(aq) 在 He 等离子射流与液体系统中的反应途径

在过去的二十年中，大气压等离子体作为水的高级氧化过程得到了深入研究。目前的研究重点是常压 He 等离子体处理的液体中 H2O2 的生成机制。在 He 等离子体射流处理后，评估了 H2O2(aq) 对液体中异丙醇 (IPA) 去除百分比的影响。通过改变初始IPA溶液温度，研究了IPA作为·OH(g)和·OH(aq)清除剂对H2O2(aq)生成的影响。我们的分析表明 H2O2(aq) 主要由 H2O2(g) 溶解到液体中形成。·OH(aq)的结合对于液体中H2O2(aq)的形成并不重要。当外源性 H2O2 加入 IPA 溶液时，由于外源性 H2O2 被 e-、H 自由基以及 He 和 He2 亚稳态分解为·OH，因此 He 等离子体射流处理可以提高 IPA 去除率。本研究对于了解等离子处理液中 H2O2(aq) 的反应途径具有重要意义。