Citation:
Yan Yang, Yang Zhang, Jin-Chao Shen, Hong Yang, Zhi-Guo Zhou, Shi-Ping Yang. A highly selective magnetic sensor with functionalized Fe/Fe3O4 nanoparticles for detection of Pb2+[J]. Chinese Chemical Letters,
;2016, 27(6): 891-895.
doi:
10.1016/j.cclet.2016.01.060
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A magnetic sensor for detection of Pb2+ has been developed based on Fe/Fe3O4 nanoparticles modified by 3-(3,4-dihydroxyphenyl)propionic acid (DHCA). The carboxyl groups of DHCA have a strong affinity to coordination behavior of Pb2+ thus inducing the transformation of Fe/Fe3O4 nanoparticles from a dispersed to an aggregated state with a corresponding decrease, then increase in transverse relaxation time (T2) of the surrounding water protons. Upon addition of the different concentrations of Pb2+ to an aq. solution of DHCA functionalized Fe/Fe3O4 nanoparticles (DHCA-Fe/Fe3O4 NPs) ([Fe] = 90 mmol/L), the change of T2 values display a good linear relationship with the concentration of Pb2+ from 40 mmol/L to 100 mmol/L and from 130 mmol/L to 200 mmol/L, respectively. Owing to the especially strong interaction between DHCA and Pb2+, DHCA-Fe/Fe3O4 NPs exhibited a high selectivity over other metal ions.
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Keywords:
- Magnetic sensor,
- Fe/Fe3O4 nanoparticles,
- Pb2+
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