超声波-高锰酸钾降解地下水中硝基苯的机理与效果

Mechanism and Efficiency of Nitrobenzene Degradation in Underground Water by Ultrasound-potassium Permanganate

采用超声波空化效应与KMnO4催化氧化作用,对地下水中硝基苯（NB）的降解效果和作用机理进行了研究,探讨了降解时间、降解温度、硝基苯初始浓度、pH值、溶液中离子强度及KMnO4的浓度等因素对氧化降解NB效果的影响。结果表明,超声空化效应与KMnO4协同氧化作用能有效地降解地下水中NB,反应过程中产生的羟基自由基（HO.）符合自由基作用机理。在pH=3~4、温度20℃、KMnO4质量浓度为1.25 mg/L时,反应60 min,超声波-KMnO4协同降解地下水中NB的效率可达93.5%。

Cavitation effects of ultrasound and catalysis oxidation of potassium permanganate is adopted to condcute research on the degradation of nitrobenzene in underground water and the paper discusses the effects of degradation time,concentration of NB,pH value,temperature,ionic strength and concentration of KMnO4 etc on degradation efficiency of NB in underground water.The results show that the ultrasound cavitation effects and the synergetic oxidation effect of KMnO4 can effectively degrade NB in underground water and the hydroxyl free radical（HO·） produced in the course of reaction accord with the mechanism of free radical function.The degradation efficiency can reach 93.5% by adopting the synergetic action of ultrasound-KMnO4 under conditions,pH=3~4、20 ℃、1.25 mg/L KMnO4 and reacting 60 minutes.