铁纳米颗粒：用于镍（II）螯合的核壳结构及独特性质

Iron nanoparticles: the core-shell structure and unique properties for Ni(II) sequestration.

作者信息

Li Xiao-qin, Zhang Wei-xian

机构信息

Center for Advanced Materials and Nanotechnology, Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, Pennsylvania 18015, USA.

出版信息

Langmuir. 2006 May 9;22(10):4638-42. doi: 10.1021/la060057k.

DOI:10.1021/la060057k

PMID:16649775

Abstract

It is demonstrated that iron nanoparticles function as a sorbent and a reductant for the sequestration of Ni(II) in water. A relatively high capacity of nickel removal is observed (0.13 g Ni/g Fe, or 4.43 mequiv Ni(II)/g), which is over 100% higher than the best inorganic sorbents available. High-resolution X-ray photoelectron spectroscopy (HR-XPS) confirms that the zerovalent iron nanoparticles have a core-shell structure and exhibit characteristics of both hydrous iron oxides (i.e., as a sorbent) and metallic iron (i.e., as a reductant). Ni(II) quickly forms a surface complex and is then reduced to metallic nickel on the nanoparticle surface. The dual properties of iron nanoparticles may offer efficient and unique solutions for the separation and transformation of metal ions and other environmental contaminants.

摘要

结果表明，铁纳米颗粒作为一种吸附剂和还原剂，用于螯合水中的Ni(II)。观察到相对较高的镍去除能力（0.13 g Ni/g Fe，或4.43 mequiv Ni(II)/g），这比现有的最佳无机吸附剂高出100%以上。高分辨率X射线光电子能谱（HR-XPS）证实，零价铁纳米颗粒具有核壳结构，并表现出水合氧化铁（即作为吸附剂）和金属铁（即作为还原剂）的特性。Ni(II)迅速形成表面络合物，然后在纳米颗粒表面还原为金属镍。铁纳米颗粒的双重特性可能为金属离子和其他环境污染物的分离和转化提供高效且独特的解决方案。