Atmospheric pressure dielectric barrier discharge (DBD) plasma is an emerging and promising technique for air disinfection in public environments. Power supply is a crucial factor but it remains unclear about its impacts on the air disinfection performance of plasmas. In this work, a nanosecond (ns) pulsed power supply was applied to drive an in-duct grating-like DBD array to achieve fast single-pass air disinfection. The influence of pulse parameters and environmental factors on both the discharge characteristics and the single-pass bacterial inactivation efficiency were uncovered. At a close relative humidity (RH) level, the efficiency was dominated by the discharge power, namely, specific input energy could serve as the disinfection dose. A higher frequency, shorter pulse rising time, and suitable pulse width are preferred to obtain a higher Z value. The pulsed source was not notably superior to an alternating current source, or even worse at a low voltage frequency at the same discharge power. Airflow humidity was a predominant factor to improve the efficiency and a single-pass efficiency of ∼ 99% and a Z value of 2.2 L/J were achieved under an optimal RH of 50%–60%. This work provides fundamental knowledge of ns-pulsed DBD on discharge characteristics and air disinfection behaviors.

中文翻译：

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纳秒脉冲 DBD 等离子体空气消毒


大气压介质阻挡放电（DBD）等离子体是一种新兴且有前景的公共环境空气消毒技术。电源是一个关键因素，但其对等离子体空气消毒性能的影响仍不清楚。在这项工作中，采用纳秒（ns）脉冲电源来驱动管道内光栅状DBD阵列，以实现快速单程空气消毒。揭示了脉冲参数和环境因素对放电特性和单程细菌灭活效率的影响。在接近的相对湿度（RH）水平下，效率由放电功率决定，即特定的输入能量可以作为消毒剂量。优选较高的频率、较短的脉冲上升时间和合适的脉冲宽度以获得较高的Z值。脉冲源并没有明显优于交流电源，甚至在相同放电功率的低电压频率下更差。气流湿度是提高效率的主要因素，在 50%–60% 的最佳相对湿度下，单程效率达到 99%，Z 值达到 2.2 L/J。这项工作提供了纳秒脉冲 DBD 在放电特性和空气消毒行为方面的基础知识。