Combined ultrasound/ozone degradation of carbazole in APG₁₂₁₄ surfactant solution

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• 作者：Guodong Ji ; ^{jiguodong@iee.pku.edu.cn} ; Baolong Zhang ; Yingchao Wu
• 关键词：Ultrasound ; Ozone ; APG1214 surfactant ; Carbazole ; Degradation mechanism
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：30 July, 2012
• 卷：225-226
• 期：Complete
• 页码：1-7
• 文件大小：1218 K

摘要

We examined the effects of power and treatment time on the ultrasonically enhanced ozonation of carbazole dissolved in APG₁₂₁₄ surfactant solutions, including an analysis of the mechanism of OH radical formation, the zeta potential of the colloidal suspension, the influence of ultrasound on micellar morphology, and the degradation kinetics for carbazole and APG₁₂₁₄. A 30 min ultrasound treatment at 28 kHz and 20 W improved the degradation of carbazole by 5-10%, while power levels of 40 W and 80 W provided improvements only during the first 5 min and resulted in reduced degradation after 15 min. The OH concentration was inversely proportional to ultrasound power, and directly proportional to the irradiation time. The absolute value of the APG₁₂₁₄ micelle zeta potential was inversely proportional to power and decreased with increasing irradiation time. The relationships of OH radical concentration in APG₁₂₁₄ micelles, the zeta potential, and the micellar dynamic radius (R_h) to ultrasonic power and time are the key factors affecting carbazole degradation in this system.