Investigation of heavy metal (Cu, Pb, Cd, and Cr) stabilization in river sediment by nano-zero-valent iron/activated carbon composite

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• 作者：Wei-fang Chen ; Jinghui Zhang ; Xiaomao Zhang…
• 关键词：Nano ; zero ; valent iron/activated carbon ; River sediment ; Heavy metal stabilization ; Leaching ; Sequential extraction
• 刊名：Environmental Science and Pollution Research
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：23
• 期：2
• 页码：1460-1470
• 全文大小：2,658 KB
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• 作者单位：Wei-fang Chen (1)
  Jinghui Zhang (1)
  Xiaomao Zhang (1)
  Weiya Wang (1)
  Yuxiang Li (1)
  
  1. School of Environment and Architecture, University of Shanghai for Science and Technology, 516 Jungong Rd., Shanghai, 200093, 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

Nano-zero-valent iron/activated carbon (nZVI/AC) composite was evaluated for its effectiveness in the stabilization of Cu, Pb, Cd, and Cr in dredged river sediment. Synthetic precipitation leaching procedure (SPLP) and toxicity characteristic leaching procedure (TCLP) were adopted to compare the effects of nZVI/AC dosage, particle size, time duration, and temperature on heavy metal leachability. The results show that leachability dropped considerably with the addition of nZVI/AC and powdered particles in the size of 0.075–0.18 mm was more effective in stabilization than granular ones. Stabilization effect was stable in long-term and robust against changes in temperature. Tessier sequential extraction revealed that heavy metals were associated with solid particle, inorganic or organic matters in sediment. The addition of nZVI/AC was able to convert relatively weakly bound heavy metals into more strongly bound species and thus reduce the bioavailability and toxicity. Also, the standard potential of heavy metals may decide the mechanism of stabilization process. Keywords Nano-zero-valent iron/activated carbon River sediment Heavy metal stabilization Leaching Sequential extraction