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首页> 美国卫生研究院文献>Polymers >Sequential Recovery of Heavy and Noble Metals by Mussel-Inspired Polydopamine-Polyethyleneimine Conjugated Polyurethane Composite Bearing Dithiocarbamate Moieties
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Sequential Recovery of Heavy and Noble Metals by Mussel-Inspired Polydopamine-Polyethyleneimine Conjugated Polyurethane Composite Bearing Dithiocarbamate Moieties

机译：贻贝启发的带有二硫代氨基甲酸酯基团的贻贝启发式聚多巴胺-聚乙烯亚胺共轭聚氨酯复合材料顺序回收重金​​属和贵金属。

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摘要

Dithiocarbamate-grafted polyurethane (PU) composites were synthesized by anchoring dithiocarbamate (DTC) as a chelating agent to the polyethyleneimine-polydopamine (PE-DA)-functionalized graphene-based PU matrix (PE-DA@GB@PU), as a new adsorbent material for the recovery of Cu2+, Pb2+, and Cd2+ from industrial effluents. After leaching with acidic media to recover Cu2+, Pb2+, and Cd2+, dithiocarbamate-grafted PE-DA@GB@PU (DTC-g-PE-DA@GB@PU) was decomposed and PE-DA@GP was regenerated. The latter was used to recover Pd2+, Pt4+, and Au3+ from the copper leaching residue and anode slime. The present DTC-g-PE-DA@GB@PU and PE-DA@GB@PU composites show high adsorption performance, effective separation, and quick adsorption of the target ions. The morphologies of the composites were studied by scanning electron microscopy and their structures were investigated by Fourier transform infrared (FT-IR) spectroscopy and Raman spectroscopy. The effects of pH values, contact time, and initial metal ion concentration conditions were also studied. An adsorption mechanism was proposed and discussed in terms of the FT-IR results.
机译：通过将二硫代氨基甲酸酯（DTC）作为螯合剂锚固到聚乙烯亚胺-聚多巴胺（PE-DA）功能化的石墨烯基聚氨酯基体（PE-DA @ GB @ PU）上，合成了二硫代氨基甲酸酯接枝的聚氨酯（PU）复合材料。用于从工业废水中回收Cu 2 + ，Pb 2 + 和Cd 2 + 的吸附材料。用酸性介质浸提以回收Cu 2 + ，Pb 2 + 和Cd 2 + 之后，将二硫代氨基甲酸酯接枝的PE-DA @ GB @分解PU（DTC-g-PE-DA @ GB @ PU）并重新生成PE-DA @ GP。后者用于从铜浸出残渣和阳极泥中回收Pd 2 + ，Pt 4 + 和Au 3 + 。本发明的DTC-g-PE-DA @ GB @ PU和PE-DA @ GB @ PU复合材料显示出高吸附性能，有效分离和目标离子的快速吸附。通过扫描电子显微镜研究了复合材料的形貌，并通过傅立叶变换红外光谱和拉曼光谱研究了复合材料的结构。还研究了pH值，接触时间和初始金属离子浓度条件的影响。根据FT-IR结果提出并讨论了吸附机理。

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