Glow Discharge Plasma Induced Dechlorination and Decomposition of Dichloromethane in an Aqueous Solution

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• 作者：Lei Wang ; Panliang Liu ; Tianxiang Chen
• 关键词：Glow discharge ; Dechlorination ; Reaction mechanism ; Aqueous
• 刊名：Plasma Chemistry and Plasma Processing
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：36
• 期：2
• 页码：615-626
• 全文大小：861 KB
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• 作者单位：Lei Wang (1)
  Panliang Liu (1) (2)
  Tianxiang Chen (1)
  
  1. College of Environmental Science and Engineering, Xiamen University of Technology, Xiamen, 361024, People’s Republic of China
  2. College of Geography and Environment Science, Northwest Normal University, Lanzhou, 730070, People’s Republic of China
  
• 刊物类别：Physics and Astronomy
• 刊物主题：Physics
  Mechanics
  Characterization and Evaluation Materials
  Mechanical Engineering
  Inorganic Chemistry
  Nuclear Physics, Heavy Ions and Hadrons
  
• 出版者：Springer Netherlands
• ISSN：1572-8986

文摘

In the present study, efficient dechlorination and decomposition of dichloromethane (DCM) induced by glow discharge plasma (GDP) in contact with an aqueous solution was investigated. Experimental results showed that DCM underwent effective dechlorination and decomposition under the action of GDP. Both the removal and the dechlorination of DCM increased with increasing pH and with the presence of hydroxyl radical scavengers and decreased with quenchers of hydrated electrons. Formic acid and formaldehyde were the major intermediate byproducts. Final products were carbon dioxide and chloride ion. Hydrated electrons were the most important active species responsible for initiation of the reaction. Hydrolysis of the resulting chloromethyl radicals played an important role in mineralization of chlorine atoms of the molecule. Hydroxyl radicals were mainly involved in the oxidation of the intermediate byproducts. Reaction mechanism was proposed based on the dechlorination kinetics and the distribution of intermediate byproducts. Keywords Glow discharge Dechlorination Reaction mechanism Aqueous