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 shu

A highly selective magnetic sensor with functionalized Fe/Fe₃O₄ nanoparticles for detection of Pb²⁺

The Key Laboratory of Resource Chemistry of Ministry of Education, Shanghai Key Laboratory of Rare Earth Functional Materials, and Shanghai Municipal Education Committee Key Laboratory of Molecular Imaging Probes and Sensors, Shanghai Normal University, Shanghai 200234, China

Received Date: 22 December 2015
Revised Date: 18 January 2016

Fund Project: This work was partially supported by National Natural Science Foundation of China (Nos. 21271130 and 21371122), Shanghai Science and Technology Development Fund (Nos. 12ZR1421800 and 13520502800) and International Joint Laboratory on Resource Chemistry (IJLRC).

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.
- Magnetic sensor,
- Fe/Fe₃O₄ nanoparticles,
- Pb²⁺
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A highly selective magnetic sensor with functionalized Fe/Fe3O4 nanoparticles for detection of Pb2+

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通讯作者: 陈斌, bchen63@163.com

A highly selective magnetic sensor with functionalized Fe/Fe₃O₄ nanoparticles for detection of Pb²⁺