Abstract

The activation of water by the atmospheric pressure air plasma is involved in the diffusion of reactive oxygen and nitrogen species (RONS) in air and water, their gas-phase and liquid-phase reactions, and their dissolution and evaporation. In this study, by generating the air spark discharge over the surface of water, we have evaluated the chemical and biological reactivities of direct–plasma treatment (DPT) and remote–plasma treatment (RPT) plasma-activated water (PAW) at different water temperatures. We have found that DPT-PAW is much more effective in increasing both the chemical and biological reactivities of PAW than RPT-PAW, and decreasing the water temperature from 40 to 6 °C leads to the rapid activation of water. Our analysis shows that when the water temperature varies from 6 to 40 °C, the activation of water by the air discharge is RONS solubility controlled, and the gas-phase and liquid-phase RONS diffusion and chemical reactions are not the controlling steps during the activation of water. The direct plasma treatment of water at a relatively low temperature contributes to an obvious increase in the RONS solubility, thus a rapid activation of DPT-PAW.

中文翻译：

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通过大气压空气火花放电控制活性氧和氮物种 (RONS) 溶解度活化水

摘要

大气压空气等离子体对水的活化涉及活性氧和氮物种（RONS）在空气和水中的扩散、它们的气相和液相反应以及它们的溶解和蒸发。在这项研究中，通过在水表面产生空气火花放电，我们评估了直接等离子体处理（DPT）和远程等离子体处理（RPT）等离子体活化水（PAW）在不同水位下的化学和生物反应性。温度。我们发现DPT-PAW在提高PAW的化学和生物反应活性方面比RPT-PAW更有效，并且将水温从40°C降低到6°C会导致水的快速活化。我们的分析表明，当水温从6℃变化到40℃时，空气放电对水的活化是由RONS溶解度控制的，气相和液相RONS扩散和化学反应不是该过程的控制步骤。水的活化。在相对较低的温度下对水进行直接等离子体处理有助于显着增加RONS溶解度，从而快速激活DPT-PAW。