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Magnetic separation of heavy metal ions and evaluation based on surface‐enhanced Raman spectroscopy: Copper(II) ions as a case study
Author(s) -
Yan Xue,
Zhang XueJiao,
Yuan YaXian,
Han SanYang,
Xu MinMin,
Gu Ren'ao,
Yao JianLin
Publication year - 2013
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.201300466
Subject(s) - copper , metal ions in aqueous solution , chelation , raman spectroscopy , chemistry , ion , surface enhanced raman spectroscopy , analytical chemistry (journal) , metal , magnetic separation , inorganic chemistry , spectroscopy , materials science , raman scattering , chromatography , metallurgy , optics , physics , organic chemistry , quantum mechanics
A new approach was developed for the magnetic separation of copper(II) ions with easy operation and high efficiency. p ‐Mercaptobenzoic acid served as the modified tag of Fe 2 O 3 @Au nanoparticles both for the chelation ligand and Raman reporter. Through the chelation between the copper(II) ions and carboxyl groups on the gold shell, the Fe 2 O 3 @Au nanoparticles aggregated to form networks that were enriched and separated from the solution by a magnet. A significant decrease in the concentration of copper(II) ions in the supernatant solution was observed. An extremely sensitive method based on surface‐enhanced Raman spectroscopy was employed to detect free copper(II) ions that remained after the magnetic separation, and thus to evaluate the separation efficiency. The results indicated the intensities of the surface‐enhanced Raman spectroscopy bands from p ‐mercaptobenzoic acid were dependent on the concentration of copper(II) ions, and the concentration was decreased by several orders of magnitude after the magnetic separation. The present protocol effectively decreased the total amount of heavy metal ions in the solution. This approach opens a potential application in the magnetic separation and highly sensitive detection of heavy metal ions.