Development of the novel liquid processing by combining an atmospheric-pressure microplasma with microbubbles

通过脉冲高压在手术针电极和GND之间产生大气压微等离子体流。研究了等离子体气体微泡对靛蓝胭脂红溶液的脱色、对电子线圈和细菌的杀菌以及氧化石墨的合成。由于臭氧的生成效率低，溶于水中的臭氧浓度不足0.25ppm，因此，可以不使用浓臭氧进行水处理。在O2等离子体鼓泡中，由于O自由基而发生快速氧化。而N2/O2等离子体鼓泡实验表明，在弱酸性条件下，有机物通过引入亚硝基和NO2离子而被缓慢分解。此外，ESR测量和化学探针法，使用对苯二甲酸显示OH自由基在水中产生的O2等离子体鼓泡。

Atmospheric-pressure microplasma flow was generated between a surgical needle electrode and GND by a pulsed high voltage. Decolorization of an indigo carmine solution, sterilization of E-coil and bacteria and synthesis of graphite oxide were studied using microbubbles of the plasma gas. Since ozone production efficiency is low and the ozone concentration dissolved in water is less than 0.25 ppm, it suggests the possibility of water treatment without using dense ozone. In O2 plasma bubbling, rapid oxidation occurs due to O radicals. On the other hand, N2/O2 plasma bubbling shows organic compounds were decomposed slowly via introducing nitroso groups with NO2 ions under weak acidity. Furthermore, ESR measurement and chemical probe method using terephthalic acid showed OH radicals generated in water by the O2 plasma bubbling.