高压脉冲气液同时放电对甲基橙的脱色

利用针板式放电,研究了水中脉冲放电对甲基橙的脱色效果.向反应体系中通入气体,可实现气液同时放电,生成的自由基增加,可提高高压脉冲液相放电体系的能量效率.对峰值电压、添加剂过氧化氢、放电形式及气体种类等因素对甲基橙溶液脱色效果的影响进行了研究.结果表明:当提高峰值电压、加入H2O2,改变放电形式(由电晕放电向火花放电转变)以及通入气体特别是氧气时甲基橙溶液的脱色效果得到显著提高.通过紫外光谱研究表明甲基橙经放电处理后分子结构中的偶氮键发生断裂,破坏了偶氮-苯环共轭发色体系,从而达到了脱色的目的.

Study on Decoloration of Methyl Orange by Pulsed Gas-Liquid Sychronous Discharge

In order to utilize the needle-plate electrode discharge,the decoloration of methyl orange in water by pulsed discharge was investigated.To improve the energy efficiency of the pulsed discharge in liquid phase,gases were bubbled into the reaction system.The discharge occurred firstly in gas phase and produced some active species which transferred into liquid phase,induced the discharge of liquid phase,then the gas-liquid discharge could be obtained.The effects of the peak voltage,additive H2O2,the discharge mode and the gas species on the decoloration rate of methyl orange were investigated.Results show that the decoloration rate of methyl orange solution was increased with increasing peak voltage,adding H2O2,spark discharge,bubbling gases(O2> Air>N2).UV-VIS spectra analyse of the methyl orange solution before and after treatment showed the bond of-N=N-can be degraded.