气-液两相高压脉冲介质阻挡放电降解罗丹明B

Degradation of Rhodamine B by High-Voltage Pulsed Dielectric Barrier Discharge in Liquid-Gas Medium

在气-液两相混合物中进行高压脉冲介质阻挡放电产生非平衡等离子体,以罗丹明B水溶液为模拟废水处理对象,考察了不同因素对降解效果的影响.实验结果表明:提高脉冲电压峰值和脉冲频率及延长放电时间均可提高罗丹明B的去除率;溶液初始pH值的提高,对于降解效率影响不大;溶液初始质量浓度提高时,罗丹明B的降解率(百分比)降低,但是降解量(质量数)提高;反应器中通入氧气时的降解效果最好,空气次之,氮气最差;在脉冲电压峰值20 kV,脉冲频率250 Hz,溶液初始质量浓度90 mg/L,初始pH 6.4,氧气通入量为12.0 L/min的实验条件下,放电处理12 min,罗丹明B的去除率可达99.1%.

A non-thermal plasma processing system was established by means of high-voltage pulsed dielectric barrier discharge in liquid-gas medium.Rhodamine B solution was chosen as the target pollutant and the degradation rates under different experimental conditions were investigated.The obtained results showed that the removal rate of Rhodamine B could be improved either by increasing the peak voltage and frequency of the pulse or by increasing the discharge time.The initial pH value of the solution had little effect on the process.For higher initial solution concentration,the degradation rate decreased,but the yield increased.Different gas introduced would influence the reaction process differently and the efficiency increased in the order of oxygen air nitrogen.Under the condition of 20kV peak pulsed voltage,250Hz pulse frequency,90mg/L initial concentration,6.4 initial pH,12.0L/min oxygen pumped in,the removal rate of Rhodamine B reached 99.1% after 12min treatment time.