【摘要】 采用气液两相滑动弧等离子体降解甲基紫溶液,研究了溶液初始pH值、载气类型、溶液初始浓度对甲基紫降解的影响,并探讨了甲基紫的降解机理.结果表明,300mg/L的甲基紫溶液,经4次循环降解后(20min),降解率达99%,COD的去除率达83%.初始溶液的pH值对甲基紫的降解几乎没有影响.分别以空气、氧气为载气,其降解率差别不大.甲基紫降解率随溶液初始浓度增大而降低,但绝对降解量随溶液初始浓度增大而增大.从能效比考虑,滑动弧等离子体适合降解高浓度的有机废水.对降解前后的紫外-可见光谱、红外光谱及GC-MS结果分析表明,甲基紫的共轭结构被破坏,但溶液中仍有少量含苯环的化合物以及酸等小分子化合物存在.更多还原

【Abstract】 The influence of initial solution pH value, carrier gas type, and initial mass concentration on the degradat efficiency of methyl violet were investigated using a gas–liquid gliding arc discharge reactor; and the degradat mechanism was also analyzed. For 300 mg/L methyl violet solution, the degradation efficiency reached 99%, and removed efficiency of COD was 83% after quartic circling (20min) degradation. The effect of initial pH value was obvious, and the degradation efficiency was almost the same with O2 and air as carrier gas respectively. With increasing initial solution concentration, the degradation efficiency decreased and the absolute degradation quantity increas Taking into account the ratio of energy and efficiency, gliding arc discharge was suitable to degrade high concentrat organic wastewater. UV-vis spectroscopy, FTIR and GC-MS of the products showed that the conjugating structure methyl violet was destroyed; and phenyl-contained compound, acid-contained compound and remaining underra alcohol-contained compound were included in the intermediate products.更多还原