Journal
FOOD CHEMISTRY
Volume 364, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.foodchem.2021.130366
Keywords
Carbon dots; Fe3O4; Heavy metal ion; Fluorescence; Detection; Removal
Funding
- Hei-longjiang Postdoctoral fund [LBHQ17084]
- Fundamental Research Funds for Heilongjiang Provincial Universities [2018KYYWF0995]
- Beihai Municipal Science and Technology Bureau [202082024]
- Excellent Scientific Research Team Project of Harbin Normal University [XKYT202001]
- Innovation Foundation of Graduate Student of Harbin Normal University [HSDSSCX2021-38]
- China Scholarship Council [201908230064]
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A unique fluorescent carbon dot-magnetic nanocomposite (Fe3O4/CDs) was prepared for sensitive detection of Hg2+, showing higher selectivity and sensitivity with a detectable limit of 0.3 nM. The emission quenched by Hg2+ could be restored in the presence of saturated EDTA solution. The Fe3O4/CDs also demonstrated effective removal of Hg2+ from samples, making it a promising probe in environmental monitoring.
The dual functional detection and removal of heavy ion metals by carbon dots has become an urgent matter of concern. Here, a unique fluorescent carbon dot-magnetic nanocomposite (Fe3O4/CDs) was prepared by hydrothermal methods for sensitive detection of Hg2+. The Fe3O4/CDs serve as fluorescent probes with higher selectivity and sensitivity for Hg2+, with the lowest detectable limit of 0.3 nM. Hg2+ statically quenched the blue emission of Fe3O4/CDs, which can be restored in the presence of saturated EDTA solution. The utilization of Fe3O4/CDs was fulfilled by recovering their emission conveniently. The recovery of Hg2+Y in Chagan Lake water, tap water and drinks was calculated at 96.5 similar to 108.8%, which demonstrates the feasibility of the Fe3O4/CDs sensing system in natural samples. Notably, the Fe3O4/CDs can drive the effective removal of Hg2+ from samples, which is of outstanding significance as a promising probe in environmental monitoring.
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