超声波降解水溶液中叔丁醇的研究

研究了超声场降解水溶液中叔丁醇的行为，并探讨了反应动力学模式。实验表明．在本实验条件下超声波降解叔丁醇能够达到较好的降解效果。叔丁醇的去除率随着超声辐射时间的延长而提高，在频率为20kHz、功率为1500W的超声场下，作用80min能够达到90％左右的去除率。反映体系的降解速率随着反应温度的提高而升高，随着初始浓度的增大而降低：反应体系的pH值对叔丁醇的降解率影响不大：溶液中溶解气体的种类对降解效果有一定影响。反应速率常数按照由快到慢的顺序为ko2〉k未作处理〉kN2。在一定的初始浓度条件下，超声波降解叔丁醇的反应符合假一级反应动力学模式。

A Study on Ultrasonic Degradation of Tert-butyl Alcohol in Aqueous Solution

The ultrasonic degradation behaviour and its kinetic model of tert-butyl alcohol (TBA) were investigated.The results have shown that TBA can be well degraded by ultrasonic wave.The rate of degrada- tion can be enhanced with extension of time.The degradation rate of TBA reaches about 90% with the ultrasonic frequency of 20 kHz and power density of 1,500 W within 80 minutes.The rate of degradation of TBA decreases with the increase of initial concentration of TBA and increases with the rise of temperature in this system.The pH value has only a little effect on the degradation of TBA.Different kinds of dissolved gases in reaction system have different impact on the degradation rate of TBA.Three gases,including O_2,N_2 and air,were investigated and their reaction constants were in a descending order of O_2,air,and N_2.On the basis of effect of initial concentration and reactor temperature,the ultrasonic degradation of TBA was found conformable with the pseudo- first-order kinetic model.