Efficient degradation of trichloroethylene in water using persulfate activated by reduced graphene oxide-iron nanocomposite

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• 作者：Ayyaz Ahmad ; Xiaogang Gu ; Li Li ; Shuguang Lv…
• 关键词：Reduced graphene oxide ; Iron ; Trichloroethylene degradation ; Persulfate ; Water treatment
• 刊名：Environmental Science and Pollution Research
• 出版年：2015
• 出版时间：November 2015
• 年：2015
• 卷：22
• 期：22
• 页码：17876-17885
• 全文大小：2,543 KB
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• 作者单位：Ayyaz Ahmad (1)
  Xiaogang Gu (1) (2)
  Li Li (1)
  Shuguang Lv (2)
  Yisheng Xu (1)
  Xuhong Guo (1) (3)
  
  1. State-Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, China
  2. State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, East China University of Science and Technology, Shanghai, 200237, China
  3. Key Laboratory of Xinjiang Uygur Autonomous Region and Engineering Research Center of Xinjiang Bingtuan of Materials-Oriented Chemical Engineering, Shihezi University, Xinjiang, 832000, China
  
• 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

Graphene oxide (GO) and nano-sized zero-valent iron-reduced graphene oxide (nZVI-rGO) composite were prepared. The GO and nZVI-rGO composite were characterized by transmission electron microscopy (TEM), Fourier transform infrared (FTIR), energy-dispersive spectroscopy (EDS), and Raman spectroscopy. The size of nZVI was about 6 nm as observed by TEM. The system of nZVI-rGO and persulfate (PS) was used for the degradation of trichloroethylene (TCE) in water, and showed 26.5 % more efficiency as compared to nZVI/PS system. The different parameters were studied to determine the efficiency of nZVI-rGO to activate the PS system for the TCE degradation. By increasing the PS amount, TCE removal was also improved while no obvious effect was observed by varying the catalyst loading. Degradation was decreased as the TCE initial concentration was increased from 20 to 100 mg/L. Moreover, when initial solution pH was increased, efficiency deteriorated to 80 %. Bicarbonate showed more negative effect on TCE removal among the solution matrix. To better understand the effects of radical species in the system, the scavenger tests were performed. The ?SO₄ ?/sup> and ?O₂ ?/sup> were predominant species responsible for TCE removal. The nZVI-rGO-activated PS process shows potential applications in remediation of highly toxic organic contaminants such as TCE present in the groundwater.