| Frequency Effects on 2-Chlorobiphenyl Sonication |
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| 引用本文： | 张光明 常爱敏 王丽. Frequency Effects on 2-Chlorobiphenyl Sonication[J]. 清华大学学报, 2004, 9(2): 181-184 |
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| 作者姓名： | 张光明 常爱敏 王丽 |
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| 作者单位： | [1]ShenzhenWaterQualityCenter,Shenzhen518001,China [2]GraduateSchoolatShenzhen,TsinghuaUniversity,Shenzhen518057,China |
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| 基金项目： | Supported by the Shenzhen Science and Technolgy Bureau of China (No. 2002-k3-134) |
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| 摘 要： | In order to better understand sonication, this paper studies the effect of sound frequency on the 2-chlorobiphenyl (2-CB) sonication and analyzes two prevailing hypotheses. Four frequencies 205, 358, 618 and 1071 kHz were tested. The 2-CB degradation kinetics, dechlorination, and inhibition by a free radical scavenger were examined. The results show that sonication effectively degrades 2-CB, and the first order rate constants using 0.4 W/cm^3 sonication are 0.214, 0.508, 0.454, and 0.248 min6-1 at 205, 358, 618, and 1071 kHz, respectively. Good dechlorination was also achieved. 358 kHz frequency provided the most efficient 2-CB degradation, but the worst dechlorination, and was most sensitive to the free radical scavenger. Detailed analyses show that thermolysis is relatively stable at these frequencies while the free radical reaction depends strongly on the sound frequency.
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| 关 键 词： | 超声波降解法 频率 自由基作用 污染治理 降解 2-氯联苯 脱氯 |
Frequency Effects on 2-Chlorobiphenyl Sonication |
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| ZHANG Guangming,CHANG Aimin,WANG Li Graduate School at Shenzhen,Tsinghua University,Shenzhen ,China, Shenzhen Water Quality Center,Shenzhen ,China. Frequency Effects on 2-Chlorobiphenyl Sonication[J]. Tsinghua Science and Technology, 2004, 9(2): 181-184 |
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| Authors: | ZHANG Guangming CHANG Aimin WANG Li Graduate School at Shenzhen Tsinghua University Shenzhen China Shenzhen Water Quality Center Shenzhen China |
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| Affiliation: | ZHANG Guangming,CHANG Aimin,WANG Li Graduate School at Shenzhen,Tsinghua University,Shenzhen 518057,China, Shenzhen Water Quality Center,Shenzhen 518001,China |
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| Abstract: | In order to better understand sonication, this paper studies the effect of sound frequency on the 2-chlorobiphenyl (2-CB) sonication and analyzes two prevailing hypotheses. Four frequencies 205, 358, 618, and 1071 kHz were tested. The 2-CB degradation kinetics, dechlorination, and inhibition by a free radical scavenger were examined. The results show that sonication effectively degrades 2-CB, and the first order rate constants using 0.4 W/cm3 sonication are 0.214, 0.508, 0.454, and 0.248 min 1 at 205, 358, 618, and 1071 kHz, respectively. Good dechlorination was also achieved. 358 kHz frequency provided the most effi-cient 2-CB degradation, but the worst dechlorination, and was most sensitive to the free radical scavenger. Detailed analyses show that thermolysis is relatively stable at these frequencies while the free radical reac-tion depends strongly on the sound frequency. |
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| Keywords: | sonication 2-chlorobiphenyl free radical reaction pollution control |
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