Degradation and dechlorination of pentachlorophenol by microwave-activated persulfate

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• 作者：Chengdu Qi (1)
  Xitao Liu (1)
  Wei Zhao (2)
  Chunye Lin (1)
  Jun Ma (1)
  Wenxiao Shi (1)
  Qu Sun (1)
  Hao Xiao (3)
  
  1. State Key Laboratory of Water Environment Simulation ; School of Environment ; Beijing Normal University ; Beijing ; 100875 ; China
  2. Institute of Scientific and Technical Information of China ; Beijing ; 100038 ; China
  3. College of Chemistry ; Beijing Normal University ; Beijing ; 100875 ; China
  
• 关键词：Pentachlorophenol ; Persulfate ; Microwave ; Dechlorination ; Toxicity
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：March 2015
• 年：2015
• 卷：22
• 期：6
• 页码：4670-4679
• 全文大小：659 KB
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• 刊物类别：Earth and Environmental Science
• 刊物主题：Environment
  Environment
  Atmospheric Protection, Air Quality Control and Air Pollution
  Waste Water Technology, Water Pollution Control, Water Management and Aquatic Pollution
  Industrial Pollution Prevention
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1614-7499

文摘

The degradation performance of pentachlorophenol (PCP) by the microwave-activated persulfate (MW/PS) process was investigated in this study. The results indicated that degradation efficiency of PCP in the MW/PS process followed pseudo-first-order kinetics, and compared with conventional heating, microwave heating has a special effect of increasing the reaction rate and reducing the process time. A higher persulfate concentration and reaction temperature accelerated the PCP degradation rate. Meanwhile, increasing the pH value and ionic strength of the phosphate buffer slowed down the degradation rate. The addition of ethanol and tert-butyl alcohol as hydroxyl radical and sulfate radical scavengers proved that the sulfate radicals were the dominant active species in the MW/PS process. Gas chromatography-mass spectrometry (GC-MS) was employed to identify the intermediate products, and then a plausible degradation pathway involving dechlorination, hydrolysis, and mineralization was proposed. The acute toxicity of PCP, as tested with Photobacterium phosphoreum, Vibrio fischeri, and Vibrio qinghaiensis, was negated quickly during the MW/PS process, which was in agreement with the nearly complete mineralization of PCP. These results showed that the MW/PS process could achieve a high mineralization level in a short time, which provided an efficient way for PCP elimination from wastewater.