Aquatic environment

Degradation of bisphenol-A using ultrasonic irradiation assisted bylow-concentration hydrogen peroxide

Kejia Zhang , Naiyun Gao , Yang Deng , Tsair Fuh Lin , Yan Ma , Lei Li , Minghao Sui


Received February 02, 2010,Revised April 20, 2010, Accepted , Available online

Volume 23,2011,Pages 31-36

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This study investigated the degradation of bisphenol-A (BPA) by ultrasonic irradiation in the presence of di erent additives (H2O2, air bubbles and humic acid) under various operating conditions, i.e., ultrasonic frequency, power intensity and power density. The results demonstrated that the BPA degradation followed pseudo first-order kinetics under di erent experimental conditions. The optimum power intensities were 0.9, 1.8, and 3.0 W/cm2 at the frequencies of 400, 670, and 800 kHz, respectively. At the fixed frequency (800 kHz), the degradation rate of BPA was shown proportional to the increase of power density applied.With this manner, the BPA sonolysis could be facilitated at H2O2 dosage being lower than 0.1 mmol/L; while BPA degradation was hindered at H2O2 concentration in excess of 1 mmol/L. Additionally, BPA removal was shown to be inhibited by the presence of aeration and humic acid during ultrasonic irradiation. The present study suggested that the degradation rate of BPA assisted by ultrasonic irradiation was influenced by a variety of factors, and high BPA removal rate could be achieved under appropriate conditions.

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