Cold atmospheric plasma discharges in air above air–water surface interface and discharges inside water with injection of air bubbles, show interesting properties for water purification. Water parameters during plasma treatment get different values depending on discharge schemes. Detailed measurements of water parameters during plasma applications as pH, oxidation–reduction potential, total dissolved solids and conductivity are essential in understanding micropollutants degradation mechanisms in water. E. coli bacteria in water have been eliminated faster by plasma discharges produced in water than in air above it. Degradations of two antibiotics oxytetracycline hydrochloride (OTC) and doxycycline hyclate (DXC) in water solution are faster for plasma generated below solution surface than above it with appearance of one degradation product for OTC and two for DXC along plasma treatment time. Degradations are enhanced in the solution after 200 h following plasma treatment for the two antibiotics. H 2 O 2 concentration can give a good indication of plasma effectiveness on different pollutants as it is a relatively stable compound. For water purification, contributions of two factors have to be identified namely water acidity with certain pH value and concentrations of reactive species generated in water. For plasma discharges inside water with air bubbles the most pronounced effect is the increasing value of H 2 O 2 generated in water, while for plasma discharges above water the effect of water acidity induced by low pH is more dominant regarding pollutants degradations.

中文翻译：

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水面以上和水面以下冷大气等离子体排放对水中抗生素的降解和细菌的灭活

冷大气等离子体在空气 - 水表面界面上方的空气中放电，并通过注入气泡在水中放电，显示出用于水净化的有趣特性。等离子处理过程中的水参数根据放电方案得到不同的值。在等离子体应用过程中详细测量水参数，如 pH 值、氧化还原电位、总溶解固体和电导率，对于理解水中微污染物的降解机制至关重要。水中产生的等离子放电比在其上方的空气中更快地消除水中的大肠杆菌。两种抗生素盐酸土霉素 (OTC) 和盐酸多西环素 (DXC) 在水溶液中的降解对于在溶液表面下方产生的等离子体比在溶液表面上方更快，随着等离子体处理时间出现一种 OTC 降解产物和 DXC 两种降解产物。在对两种抗生素进行等离子体处理 200 小时后，溶液中的降解增强。H 2 O 2 浓度可以很好地指示血浆对不同污染物的有效性，因为它是一种相对稳定的化合物。对于水净化，必须确定两个因素的贡献，即具有特定 pH 值的水酸度和水中产生的活性物质的浓度。对于带有气泡的水中的等离子体放电，最显着的影响是水中产生的 H 2 O 2 值增加，