介质阻挡放电等离子体对甲基蓝的脱色研究

Research on Dielectric Barrier Discharge Plasma for the Decoloration of Methyl Blue

主要利用射流介质阻挡放电阵列,在水中放电产生等离子体并开展甲基蓝溶液脱色处理研究。通过紫外吸收光谱在590 nm处吸收峰对甲基蓝进行表征。实验结果表明:在工作气体为Air(100%)和He/Air(1:1)的混合条件下,放电处理5 min后甲基蓝的脱色率高达99.99%;在工作气体为He条件下,处理5 min后甲基蓝的脱色率仅为3%。研究分析表明N2和O2在放电过程中形成大量的氮、氧活性粒子,这些氮、氧活性粒子有极强的化学活性,对甲基蓝脱色过程产生重要的影响。

The plasma produced by dielectric barrier discharge jet array was used to decolorize methyl blue solution. Based on UV absorption spectrum,the methyl blue was characterized at590 nm. The results showed that under the condition of the plasma generated by Air（100%）and He/Air（1： 1）,the decoloration rate of methyl blue was 99. 99% after 5mins treatment.While the helium was used as the working gas,the decoloration rate of methyl blue was only 3%after 5mins treatment. Further analysis indicated that during the processing of discharging,N2 and O2could produce a large amount of reactive nitrogen and oxygen species which have an important effect on the decoloration process of methyl blue because of high chemical activity.