Comparison of ultrasonic degradation rates constants of methylene blue at 22.8 kHz, 127 kHz, and 490 kHz
Comparison of ultrasonic degradation rates constants of methylene blue at 22.8 kHz, 127 kHz, and 490 kHz
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DOI：
10.1016/j.ultsonch.2012.01.004
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发表时间：
2012-07-01
影响因子：
8.4
通讯作者：
Shono, Atsushi
中科院分区：
文献类型：
--
作者：
Kobayashi, Daisuke;Honma, Chiemi;Shono, Atsushi
溶剂萃取、焚烧、化学脱卤和生物降解等技术已被研究用于降解有害有机化合物。我们发现超声波是一种有吸引力的技术，用于降解水中的有害有机化合物。然而，超声频率对降解速率常数的影响没有定量研究。本研究以亚甲基蓝为模型化合物，研究了超声波对亚甲基蓝的降解过程。研究了超声频率和超声功率对降解速率常数的影响。亚甲基蓝浓度的时间依赖性假设假一级动力学的分解的基础上估计的表观降解速率常数。确定了表观降解速率常数与超声功率之间的线性关系。此外，在127和490 kHz的频率下的表观降解速率常数远大于22.8 kHz。在此基础上，提出了一种基于超声功率和声化学效率值估算亚甲基蓝表观降解速率常数的简单模型。皇冠版权所有（C）2012由Elsevier B.V.出版。保留所有权利。
Techniques such as solvent extraction, incineration, chemical dehalogenation, and biodegradation have been investigated for the degradation of hazardous organic compounds. We found ultrasound to be an attractive technology for the degradation of hazardous organic compounds in water. However, the effects of ultrasonic frequency on degradation rate constants were not investigated quantitatively. In this study, the degradation process of a model for hazardous organic compound methylene blue was investigated using ultrasonic irradiation. The study focused on the effects of ultrasonic frequency and ultrasonic power on the degradation rate constant. The apparent degradation rate constants were estimated based on time dependence of methylene blue concentration assuming pseudo-first-order kinetics for the decomposition. A linear relationship between the apparent degradation rate constant and ultrasonic power was identified. In addition, the apparent degradation rate constants at frequencies of 127 and 490 kHz were much larger than those at 22.8 kHz. A relationship between the apparent degradation rate constant and the sonochemical efficiency value (SE value) was also found. Based on these results, a simple model for estimating the apparent degradation rate constant of methylene blue based on the ultrasonic power and the SE value is proposed in this study. Crown Copyright (C) 2012 Published by Elsevier B.V. All rights reserved.