等离子体降解水相中有机污染物的机理研究

Degradation mechanism of organic pollutant in water by plasma

研究了等离子体在内电极通氧条件下降解水相中甲基紫的机理 .研究表明 ,甲基紫的降解率与等离子体的电压和处理时间呈线性关系、与甲基紫溶液的浓度呈指数关系 ,溶液的pH随着处理时间的增加而下降 ;10 0mg L甲基紫经等离子体处理 3s ,其降解率可达 95 %以上 ,COD下降 5 0 %左右 ;在等离子体条件下 ,甲基紫溶液的降解是氧原子、电子、活性自由基和离子等共同的作用的结果 .

The degradation mechanism of methyl violet in water with O-2 was studied using plasma method.The degradation efficiency of aqueous methyl violet showed linearity relation with both plasma voltage and discharge time, while it had exponential relation with concentration of aqueous methyl violet. The pH of aqueous methyl violet declined along treating time increasing. After discharge for 3*!s, the degradation efficiency of 100*!mg/L of aqueous methyl violet reached up to 95%, COD reduced 50%. At the point of the plasma, the degradation of methyl violet in water with O-2 is a collective action of oxygen atom, electron and radical.