Investigation of heavy metal (Cu, Pb, Cd, and Cr) stabilization in river sediment by nano-zero-valent iron/activated carbon composite
| Autor: | Yuxiang Li, Weifang Chen, Jinghui Zhang, Xiaomao Zhang, Weiya Wang |
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| Rok vydání: | 2015 |
| Předmět: |
Chromium
Geologic Sediments Health Toxicology and Mutagenesis Iron Inorganic chemistry 0211 other engineering and technologies chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Metal Rivers Metals Heavy medicine Environmental Chemistry 0105 earth and related environmental sciences 021110 strategic defence & security studies Cadmium Toxicity characteristic leaching procedure Zerovalent iron Metallurgy General Medicine Pollution chemistry Lead visual_art Charcoal visual_art.visual_art_medium Leaching (metallurgy) Particle size Copper Water Pollutants Chemical Activated carbon medicine.drug |
| Zdroj: | Environmental science and pollution research international. 23(2) |
| ISSN: | 1614-7499 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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