超声协同下零价铁还原降解水溶液中的四氯化碳

Ultrasound Assisted Reductive Degradation of CCl 4 in Solution by Zero-valent Iron Reductant

借助于正交设计优化法,通过超声协同试验,探讨了降解反应温度、pH值、超声功率和零价铁投加量4个主要因素对于水溶液中四氯化碳的降解规律。通过对正交试验结果的直观和方差分析,获得了四氯化碳降解的优化操作工艺条件。同时,依据优化条件,重点试验并讨论了超声功率和反应温度对四氯化碳降解率的影响。研究结果表明:最优条件下四氯化碳的最大降解率可达97.57%;零价铁还原降解四氯化碳的影响因素从主到次的顺序为降解温度>pH>超声功率>零价铁投加量;随着超声功率的加大,四氯化碳的降解率随之增加;反应温度的升高有利于提升四氯化碳的还原降解率。

The effect of reaction temperature,pH value,ultrasonic power and zero-valent iron dosage on the reductive degradation of CCl4 in solution were investigated via ultrasound assistance by means of orthogonal optimizing design. The optimum process conditions for CCl4 reductive degradation were obtained with the intuitive and variance analysis from the orthogonal experimental results. Meanwhile,according to the optimum conditions the effects of ultrasonic power and reaction temperature on the CCl4 degradation rate were experimented and analyzed. It is shown that under the optimum conditions the maximum degradation rate of CCl4 can reach 97. 57%. The effecting factors for CCl4 reductive degradation are found to follow such an order from strong to weak as reaction temperature > pH value > ultrasonic power > zero-valent iron dosage. The CCl4 degradation rate rises with the enlargement of the ultrasonic power. The increase of the reaction temperature can improve the degradation rate of CCl4.