Preparation of Cysteine-Functionalized Fe3O4 Magnetic Nanoparticles for Determination of Cu~(2+)

摘要

Cysteine-functionalized Fe3O4 magnetic nanoparticles were synthesized by thiol-ene click reaction and characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction spectrometry (XRD), thermal gravimetric analysis (TGA), vibrating sample magnetometer (VSM), X-ray photoelectron spectroscopy (XPS), specific surface area (BET) analysis and pore size distribution analysis. The obtained magnetic materials were employed as a magnetic solid phase extraction adsorbent combined with inductively coupled plasma-atomic emission spectrometry (ICP-AES) for determination of Cu~(2+). Several parameters affecting extraction efficiency, including eluent concentration, adsorption time, adsorbent amounts, and sample pH were investigated. Under the optimized conditions, the method was validated. Within the concentration range of 0.01–20 μgmL~(-1), The limit of detection (LOD) and the limit of quantification (LOQ) were determined to be 0.002 μgmL~(-1) and 0.007 μgmL~(-1), respectively. The adsorption percentage of Cu~(2+) ions remained above 87.0% when the adsorption-desorption data of Cu~(2+) ions through three cycles of the successive adsorption and desorption process. The results show that a reliable and rapid method was established for determination of Cu~(2+) ions.