过二硫酸钾在超声和紫外条件下氧化降解DDT的研究

目的]研究过二硫酸钾氧化降解DDT反应的影响因素。方法]考查pH值、氧化剂浓度、超声和紫外光对过二硫酸钾氧化降解DDT反应的影响,并应用于淡水和海水中。结果]结果表明,随pH值的降低、过二硫酸钾浓度的升高,氧化降解DDT的效果越好。超声和紫外光的协同作用对反应的促进作用更大。应用于淡水和海水中氧化降解DDT,1.0 h DDT的降解率达90%,2.5 h DDT的降解率达99%。结论]用过二硫酸钾氧化降解环境水中的DDT是一个适用范围较、效率高的简捷方法。

Study on the Oxidation DDT with Potassium Peroxydisulfate under the Ultrasonic and Ultraviolet Light Conditions

Objective] The purpose was to study the influencing factors of oxidizing and degrading DDT with potassium peroxydisulfate.Method] The effect of pH value,the concentration of oxidants,ultrasound and ultraviolet on oxidizing and degrading DDT was studied in detail.The method could be applied to oxidize DDT in freshwater and seawater.Result]The results showed that the effect of oxidizing and degrading DDT was better along with the reduction of pH value and increase of potassium peroxydisulfate concentration,the synergism of the ultrasonic and ultraviolet light had bigger promoting action on oxidizing and degrading DDT.The degradation efficiency of DDT in freshwater and seawater were 90% after 1.0 h and 99% after 2.5 h,respectively.Conclusion] Oxidizing and degrading DDT of environment water with potassium peroxydisulfate is a more efficient,easy and simple method.