二乙基二硫代氨基甲酸钠
二硫代氨基甲酸盐
化学
螯合作用
萃取(化学)
水溶液中的金属离子
核化学
金属
钠
流出物
沉积物
环境化学
无机化学
色谱法
环境工程
地质学
有机化学
工程类
古生物学
作者
Tianlin Deng,Bingru Zhang,Fengting Li,Luyao Jin
出处
期刊:Chemosphere
[Elsevier]
日期:2016-11-06
卷期号:168: 450-456
被引量:17
标识
DOI:10.1016/j.chemosphere.2016.09.152
摘要
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.
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