聚乙烯亚胺-二氧化硅纳米复合粒子的铜结合性能,Langmuir

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聚乙烯亚胺-二氧化硅纳米复合粒子的铜结合性能
Langmuir ( IF 3.7 ) Pub Date : 2022-08-19 , DOI: 10.1021/acs.langmuir.2c01457
Alexandra Semenova ₁ , Luke W Giles ₁ , Mark Louis P Vidallon ₁ , Bart Follink ₁ , Paul L Brown ₂ , Rico F Tabor ₁

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对铜资源的需求不断增加，伴随着污染的加剧，迫切需要有效的铜结合和提取材料。聚乙烯亚胺 (PEI) 是最强的铜螯合剂之一，但由于其在水中的高溶解度，因此不能直接（原样）适用于大多数应用。基于 PEI 的复合材料显示出作为高效实用替代品的潜力。在目前的工作中，研究了铜离子与 PEI-二氧化硅纳米复合颗粒和前体 PEI 微凝胶（作为参考）的相互作用。据推测，该反应的主要驱动力是铜离子被 PEI 网络中的氨基螯合。与母体微凝胶相比，PEI-二氧化硅复合材料中二氧化硅的存在增加了铜结合能力。与原始复合材料和微凝胶颗粒相比，蚀刻（无 PEI“幽灵”）复合颗粒的铜结合行为表明，复合结构中的二氧化硅纳米颗粒增加了 PEI 网络中铜结合位点的数量，而不是吸附铜他们自己。PEI-二氧化硅复合材料在吸附铜后可以很容易地回收，只需在 1 M 硝酸中洗涤，即可完全提取铜。采用这种回收方法，PEI-二氧化硅复合颗粒可用于铜去除和提取的多个有效循环。

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Copper-Binding Properties of Polyethylenimine–Silica Nanocomposite Particles

Increasing demand for copper resources, accompanied by increasing pollution, has resulted in an urgent need for effective materials for copper binding and extraction. Polyethylenimine (PEI) is one of the strongest copper-chelating agents but is not suitable directly (as is) for most applications due to its high solubility in water. PEI-based composite materials show potential as efficient and practical alternatives. In the present work, the interaction of copper ions with PEI–silica nanocomposite particles and precursor PEI microgels (as a reference) is investigated. It is hypothesized that the main driving force of the reaction is chelation of copper ions by amino groups in the PEI network. The presence of silica in the PEI–silica composites was shown to increase the copper-binding capacity in comparison with the parent microgel. The copper-binding behavior of etched (PEI-free “ghost”) composite particles in comparison with the original composites and microgel particles shows that silica nanoparticles in the composite structure increase the number of copper-binding sites in the PEI network rather than adsorbing copper themselves. PEI–silica composites can be easily recycled after copper adsorption by simply washing in 1 M nitric acid, which results in complete copper extraction. Employing this recovery method, PEI–silica composite particles can be used for multiple, efficient cycles of copper removal and extraction.

更新日期：2022-08-19

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