Sediment washing by EDTA and its reclamation by sodium polyamidoamine-multi dithiocarbamate
| Autor: | Tianlin Deng, Fengting Li, Bingru Zhang, Luyao Jin |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Dendrimers
Environmental Engineering Health Toxicology and Mutagenesis Metal ions in aqueous solution Sodium 0208 environmental biotechnology Sediment (wine) chemistry.chemical_element 02 engineering and technology 010501 environmental sciences 01 natural sciences Divalent chemistry.chemical_compound Thiocarbamates Metals Heavy Polyamines Soil Pollutants Environmental Chemistry Chelation Dithiocarbamate Edetic Acid Environmental Restoration and Remediation Sodium diethyldithiocarbamate Chelating Agents 0105 earth and related environmental sciences chemistry.chemical_classification Extraction (chemistry) Metallurgy Public Health Environmental and Occupational Health General Medicine General Chemistry Pollution 020801 environmental engineering chemistry Nuclear chemistry |
| Zdroj: | Chemosphere. 168:450-456 |
| ISSN: | 0045-6535 |
| DOI: | 10.1016/j.chemosphere.2016.09.152 |
| Popis: | Sodium polyamidoamine-multi dithiocarbamate (PAMAM-DTC) is a kind of heavy metals capturing agent, containing functional groups of dithiocarbamate that could strongly chelate heavy metals. In this paper, it was applied to precipitate heavy metal ions from meal-EDTA and reclaim EDTA during sediment washing process. The extracting performance of fresh EDTA was studied as a function of EDTA concentration, liquid/sediment (L/S), pH, and extraction time. Then the EDTA effluents were treated with PAMAM-DTC, Na2S and sodium diethyldithiocarbamate (DDTC) to compare their effectiveness on capturing metals from metal-EDTA complexes. Four divalent heavy metals were investigated (Pb, Cd, Cu, Zn). PAMAM-DTC shows much better performance. Pb, Cd and Cu could almost be precipitated completely by PAMAM-DTC under the dosage of 350 mg L-1, while Zn could be only partly precipitated which may due to its failure in competition with the other three metal ions on chelation with PAMAM-DTC. The reclaimed EDTA was reused in three cycles of sediment washing, and the amount of heavy metals extracted just slightly decreased in each cycle. |
| Databáze: | OpenAIRE |
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