College of Construction and Environment Engineering, Shenzhen Polytechnic, Shenzhen, Guangdong Province, China.
Ultrason Sonochem. 2011 Sep;18(5):1077-81. doi: 10.1016/j.ultsonch.2011.03.014. Epub 2011 Apr 13.
This study is to apply ultrasound to remove m-xylene, a volatile compound from aqueous solutions which causes environmental damage. High frequency ultrasound was used to investigate the effect of different operational parameters, such as m-xylene initial concentration, ultrasonic frequency and ultrasonic power. The degradation rate of m-xylene was increased with decreasing initial concentration of m-xylene and increasing frequency and power. Optimal conditions include 26.07 mg/L, 806.3 kHz and 70±1 W, in which MnO(2), Cu(2+), Fe(2+), and H(2)O(2) had little or no effect on the degradation. Moreover, the effect of radical scavengers such as Na(2)CO(3) and t-butyl was not obvious, which indicates that direct pyrolysis inside the collapsing bubbles has an important role in m-xylene ultrasonic removal. In addition, the degradation of m-xylene was observed to behave under pseudo-first-order kinetics with different experimental conditions tested in the present work.
本研究旨在应用超声波去除二甲苯，这是一种挥发性化合物，会对环境造成破坏。高频超声波用于研究不同操作参数对二甲苯的影响，如二甲苯初始浓度、超声波频率和超声波功率。随着二甲苯初始浓度的降低、频率和功率的增加，二甲苯的降解率增加。最佳条件包括 26.07mg/L、806.3kHz 和 70±1W，其中 MnO(2)、Cu(2+)、Fe(2+)和 H(2)O(2)对降解几乎没有影响。此外，自由基清除剂如 Na(2)CO(3)和 t-丁基的影响不明显，这表明在气泡坍塌过程中直接热解对二甲苯的超声去除具有重要作用。此外，在本工作中测试的不同实验条件下，观察到二甲苯的降解符合假一级动力学。
