| 超声波/零价铁协同降解三氯甲烷特性研究 |
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| 引用本文： | 张良长,戴友芝,田凯勋,程 婷.超声波/零价铁协同降解三氯甲烷特性研究[J].环境科学研究,2008,21(6):211-215. |
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| 作者姓名： | 张良长 戴友芝 田凯勋 程 婷 |
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| 作者单位： | 湘潭大学 环境科学与工程系, 湖南 湘潭 411105 |
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| 基金项目： | 国家自然科学基金项目，湖南省教育厅资助科研项且 |
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| 摘 要： | 研究三氯甲烷在单独超声(US)、单独零价铁(Fe0)及超声波/零价铁协同体系(US/Fe0)中的降解发现,拟一级动力学能很好地拟合降解过程,协同体系中三氯甲烷一级降解速率常数(KUS/Fe0)为0.010 3 min-1,约为同等条件下零价铁体系所得KFe0的3倍,且大于KFe0与KUS之和,说明二者之间存在协同效应.考察零价铁投加量〔ρ(Fe0)〕，初始pH，初始三氯甲烷浓度(c0)，超声功率，溶液离子强度等控制参数对三氯甲烷降解速率(KUS/Fe0)的影响,结果表明,其拟一级速率常数分别在ρ(Fe0)为6 g/L,初始pH为6.0,c0为5 mmol/L以及0.5 mol/L Na2SO4当量离子强度下达最大值,并且随着超声功率的增大而增大.
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| 关 键 词： | 超声空化 废水处理 三氯甲烷 铁 |
| 收稿时间： | 2008/2/28 0:00:00 |
| 修稿时间： | 2008/3/17 0:00:00 |
Characteristics of Trichloromethane Degradation by Ultrasound Combined with Zero-valent Iron |
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| ZHANG Liang-chang,DAI You-zhi,TIAN Kai-xun and CHENG Ting.Characteristics of Trichloromethane Degradation by Ultrasound Combined with Zero-valent Iron[J].Research of Environmental Sciences,2008,21(6):211-215. |
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| Authors: | ZHANG Liang-chang DAI You-zhi TIAN Kai-xun and CHENG Ting |
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| Affiliation: | Department of Environmental Science and Technology, Xiangtan University, Xiangtan 411105, China |
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| Abstract: | Trichloromethane degradation in the synergistic system of ultrasound and elemental iron was investigated.The results indicated that the degradation process of trichloromethane can be perfectly fitted by the pseudo-first-order kinetics.Thefirst-order rate constant of degradation (KUS/Fe0) of trichloromethane in this synergistic system was 0.010 3 min-1, which was almostthreefold as large as KFe0, and was higher than the sum of KUS and KFe0.This suggested that synergistic effects existed between ultrasound and Fe0.This study also investigated the effects of ρ(Fe0), initial pH, initial trichloromethane concentration (c0), ultrasonic power and ionic strength on the degradation rate of trichloromethane.The results showed that the pseudo-first-order rate constant reached the highest at the conditions of ρ(Fe0)6 g/L, initial pH6.0, c05 mmol/L, and c(Na2SO4)0.5 mol/L, and the pseudo-first-order rate constant increased with increasing ultrasonic power. |
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| Keywords: | ultrasonic cavitation wastewater disposal chloroform iron |
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