期刊
ELECTROANALYSIS
卷 31, 期 8, 页码 1465-1474出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/elan.201900234
关键词
Amino-functionalization; Electrochemical determination; Fe3O4@carbon microspheres; Heavy metal ions
资金
- National Natural Science Foundation of China [51572019]
- National Natural Science Foundation for Excellent Young Scholars of China [51522402]
Amino-functionalized Fe3O4@carbon microspheres (NH2-Fe3O4@C) were prepared and the electrochemical sensor was constructed using NH2-Fe3O4@C modified glassy carbon electrodes (GCE) to determine toxic heavy metals in aqueous solution. Scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR) were used to characterize the structure and phase of NH2-Fe3O4@C. Cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) results indicate that NH2-Fe3O4@C modified GCE possesses large active area and excellent electron transfer. Under optimized electrochemical condition, Cd(II), Pb(II) and Cu(II) were determined using NH2-Fe3O4@C modified GCE. The electrode through amino functionalization exhibits higher sensitivity and lower detection limit toward Cd(II) and Cu(II) due to the acid-base pairing interaction between the electron-rich -NH2 ligand and the electron-deficient heavy metal ions. Compared with other similar results reported in the literature, the NH2-Fe3O4@C modified electrode exhibits wider linear response range while with comparable lower detection limit. It also exhibits excellent stability, reproducibility and anti-interference ability.
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