罗丹明B的声化学反应速率研究

Study on the sonochemical reaction of Rhodamine B

选择了水溶液中的罗丹明B的声化学反应为研究体系,探讨了超声频率为19.6 kHz时,罗丹明B声化学反应的速率规律。结果表明,在实验条件下,罗丹明B的声化学反应符合一级反应的动力学规律,反应速率常数随着超声功率的增加而增加,随着操作温度、罗丹明B的初始浓度和pH值的增加而减小,当罗丹明B的初始浓度为0.01 mmol/L,操作温度为35℃,超声功率为230 W,pH值从1.9变化到11.7时,其声化学反应速率常数从0.21 min-1变化到4.39×10-2min-1;曝气也能影响罗丹明B的声化学反应速率常数。

Effects on the sonochemical reaction of Rhodamine B were studied under a 19.6 kHz ultrasonic irradiation. The sonochemical reaction of Rhodamine B solution follows first-order kinetics. The reaction rate constant of Rhodamine B under the influence of ultrasonic power,initial concentration of Rhodamine B,operation temperature, pH of aqueous solution and aeration was investigated. The results show that when the ultrasonic power goes up, the reaction rate constant increases. The reaction rate constant decreases with increasing the initial concentration of Rhodamine B, operation temperature, and pH of aqueous solution. When pH of aqueous solution changes from 1.9 to 11.7 at initial concentration of Rhodamine B 0.01 mmol/L,ultrasonic power 230 W and operation temperature 35 ℃, the sonochemical reaction rate constants of Rhodamine B can change from 0.21 min ^-1 to 4.39 × 10 ^-2 min^-1. Aeration has some influence on the reaction rate constant of Rhodamine B.