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

通过脉冲高压在外科针电极和GND之间产生大气压微等离子体流。利用等离子体气体的微气泡，研究了靛红溶液的脱色、电子线圈和细菌的杀菌以及氧化石墨的合成。由于臭氧的产生效率很低，而且溶解在水中的臭氧浓度低于0.25ppm，这表明了不使用高浓度臭氧进行水处理的可能性。在氧气等离子体鼓泡中，由于氧自由基的作用，会发生快速氧化。另一方面，N_2/O_2等离子体气泡实验表明，在弱酸性条件下，引入亚硝基和亚硝酸根离子可以使有机物缓慢分解。此外，ESR测量和对苯二甲酸化学探针法表明，O2等离子体鼓泡在水中产生了OH自由基。

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.