沿面脉冲流光放电等离子体降解水中的氟磷酸二异丙酯

DEGRADATION OF DFP IN WATER BY PULSED STREAMER CORONA PLASMA ALONG WATER SURFACE

采用沿面流光放电等离子体考察了水中G类毒剂模拟剂氟磷酸二异丙酯（DFP）的降解效果及影响因素。结果表明,高压脉冲沿面流光放电等离子体可以有效降解水中的DFP。DFP的去除率随放电电压、放电频率和放电电极数目的增加而升高,随放电间距的增加而降低,水样初始DFP含量对其去除率的影响不大。当放电电压为20kV、放电频率为1 000 Hz、放电间距为5 mm、放电电极数目为9时,初始质量浓度为65-126.5 mg/L的DFP溶液经60min的放电处理后,DFP去除率可达96%以上。反应动力学分析结果表明,等离子体降解DFP的反应符合1级反应动力学特征,其反应速率常数约为0.055min-1。

This paper discusses the effect and influencing factors in degrading DFP, a stimulant of G-agent, by pulsed streamer corona plasma along water surface. The results show that the removal rates of DFP rise with increasing the applied voltage, discharge frequency and number of high-voltage electrode, and reducing electrode gap distance between discharging electrode and water surface. The initial concentration of DFP has little influence on DFP removal rates. Under 20 kV, 5 mm gap distance, 9 electrodes, 1 000 Hz pulse frequency, the removal rate under an initial mass concentration of 65 - 126.5 mg/L is 96% afler 60 rain plasma processing. The analysis on reacting dynamics indicates that the DFP degradation in water is first-order kinetics, and the average reaction rate constant is 0.055 min^-1.