| Cl-/PMS体系降解甲氧苄啶的效能与机理 |
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| 引用本文： | 古振川,高乃云,安娜,陈菊香. Cl-/PMS体系降解甲氧苄啶的效能与机理[J]. 中国环境科学, 2018, 38(3): 977-984 |
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| 作者姓名： | 古振川 高乃云 安娜 陈菊香 |
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| 作者单位： | 1. 同济大学环境科学与工程学院, 污染控制与资源化研究国家重点实验室, 上海 200092;2. 新疆大学建筑工程学院, 新疆 乌鲁木齐 830046 |
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| 基金项目： | 国家科技重大专项（2012ZX07403-001）；国家科技重大专项（2014ZX07406-002）；国家自然科学基金（51608372） |
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| 摘 要： | 采用氯离子（Cl－）作为阴离子活化剂，活化单过硫酸氢钾（PMS）氧化降解甲氧苄啶（TMP）.研究了Cl－/PMS体系降解TMP中起主要作用的活性物种，同时考察了Cl－浓度、PMS投加量、初始pH值对降解效果的影响，并研根据中间产物推断了TMP降解路径.实验结果表明，Cl－/PMS体系中的主要活性物种是Cl－和PMS直接反应生成的活性氯.降解过程符合拟一级反应动力学模型（R2>0.99）；随着Cl－浓度和PMS投加量增加，反应速率常数kobs增大；初始pH范围在5.0~9.0范围内，随着pH值的增大，TMP的去除率先减小后增大；TMP主要经历了氯取代和羟基取代过程，其核心结构上没有实质性的分解.
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| 关 键 词： | 单过硫酸氢盐 甲氧苄啶 活性氯 反应动力学 反应机理 |
| 收稿时间： | 2017-08-19 |
Efficiencyandmechanismoftrimethoprimdegradationin Cl-/PMS system |
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| GU Zhen-chuan,GAO Nai-yun,AN Na,CHEN Ju-xiang. Efficiencyandmechanismoftrimethoprimdegradationin Cl-/PMS system[J]. China Environmental Science, 2018, 38(3): 977-984 |
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| Authors: | GU Zhen-chuan GAO Nai-yun AN Na CHEN Ju-xiang |
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| Affiliation: | 1. State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China;2. College of Architecture and Civil Engineering, Xinjiang University, Urumqi 830046, China |
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| Abstract: | Cl- activated peroxymonosulfate (PMS) wasusedto degrade trimethoprim (TMP).The active subustance generated in Cl-/PMS systemwas identified.Effects of chloride concentration,PMS dosage,initial pH value on the degradation efficiency of TMP were evaluated.Degradation pathway of TMP was exploredbasedon the identification of degradation intermediates.The results indicated thatthedegradationof TMP was mainly ascribedto the active chlorine species,which was generatedfrom the direct reaction of Cl- with PMS.TMP degradation kinetics fitted well with the pseudo-first-ordermodel.The reaction constant increased with the increasing of the Cl- concentration and PMS dosage.The corresponding degradation rate decreased firstly and then increased when the initial pH varied between 5.0 and 9.0.The results also indicated that TMP was notsubstantially destructed upon reactions with active chlorine specieswhileawide variety of (multi) chlorinated and hydroxylated productsare formed. |
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| Keywords: | peroxymonosulfate trimethoprim activechlorine reactionkinetics reaction mechanis |
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