The role of different plasma forming gases on chemical species formed in plasma activated water (PAW) and their effect on its properties
The role of different plasma forming gases on chemical species formed in plasma activated water (PAW) and their effect on its properties
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DOI：
10.1088/1402-4896/ac6d1b
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发表时间：
2022-05
期刊：
影响因子：
2.9
通讯作者：
Vikas Rathore;S. Nema
中科院分区：
文献类型：
--
作者：
Vikas Rathore;S. Nema
本文研究了等离子体形成气体（空气、氮气（N2）、氩气（Ar）、氦气（He）及其与氧气（O2）的混合气体）对等离子体活化水（PAW）性能的影响。进行电诊断和光学发射光谱以表征等离子体并识别等离子体自由基/物种。结果表明，在N2、Ar和He等离子体中引入O2，抑制了N2等离子体中NO的吸收带、Ar和He等离子体中OH吸收带以及He等离子体中N2第二正离子体系的发射线强度。在Ar、He等离子体中加入O2，使等离子体的放电特性由辉光放电转变为微弧放电。与其他等离子体形成气体及其与O2的混合物相比，由空气及其与O2的混合物制备的PAW显示出改善的物理化学性质和其中的RONS浓度。此外，增加等离子体-水暴露时间显着影响的物理化学性质和RONS在PAW的浓度。因此，等离子体形成气体和等离子体-水暴露时间给出了更好的控制PAW的性能。因此，这些参数在决定等离子弧焊的应用中起着重要的作用。
The present work showed the role of plasma-forming gases (air, nitrogen (N2), argon (Ar), helium (He), and their mixture with oxygen (O2)) on the properties of plasma-activated water (PAW). Electrical diagnosis and optical emission spectroscopy were performed to characterize plasma and identify plasma radicals/species. The PAW is characterized by studying its physicochemical properties and dissolved reactive oxygen-nitrogen species (RONS) concentration in it. The results showed introducing O2 in N2, Ar and He plasma suppresses the emission lines intensity of NOϒ band in N2 plasma, OH band in Ar and He plasma, and N2 second positive system in He plasma. Also, adding O2 to Ar and He plasma changes the plasma discharge characteristic from glow discharge to filamentary micro-discharge. The PAW prepared by air and its mixture with O2 showed improved physicochemical properties and RONS concentration in it compared to other plasma forming gases and their mixture with O2. In addition, increasing plasma-water exposure time significantly affects the physicochemical properties and RONS concentration in PAW. Therefore, plasma forming gas and plasma-water exposure time gives better control over the properties of PAW. Hence, these parameters play a significant role in deciding the applications of PAW.