Carbon dots-magnetic nanocomposites for the detection and removal of Hg2

Ruyan Xie; Yaoyao Qu; Mingyu Tang; Jingqiang Zhao; Sophie Chua; Tingting Li; Fang Zhang; Andrew E H Wheatley; Fang Chai

doi:10.1016/j.foodchem.2021.130366

Carbon dots-magnetic nanocomposites for the detection and removal of Hg²

Food Chem. 2021 Dec 1:364:130366. doi: 10.1016/j.foodchem.2021.130366. Epub 2021 Jun 15.

Authors

Ruyan Xie¹, Yaoyao Qu¹, Mingyu Tang¹, Jingqiang Zhao¹, Sophie Chua², Tingting Li¹, Fang Zhang³, Andrew E H Wheatley², Fang Chai⁴

Affiliations

¹ Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, Heilongjiang Province; Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, 150025, China.
² Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge CB2 1EW, UK.
³ Beibu Gulf Institute of Marine Advanced Materials, Beihai, 536015, China. Electronic address: zhang_fang2121@sina.com.
⁴ Key Laboratory of Photochemical Biomaterials and Energy Storage Materials, Heilongjiang Province; Key Laboratory for Photonic and Electronic Bandgap Materials, Ministry of Education, College of Chemistry and Chemical Engineering, Harbin Normal University, Harbin, 150025, China; Department of Chemistry, University of Cambridge, Lensfield Rd, Cambridge CB2 1EW, UK. Electronic address: fangchai@gmail.com.

PMID: 34175618
DOI: 10.1016/j.foodchem.2021.130366

Abstract

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⁺ in Chagan Lake water, tap water and drinks was calculated at 96.5 ~ 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.

Keywords: Carbon dots; Detection; Fe(3)O(4); Fluorescence; Heavy metal ion; Removal.

MeSH terms

Carbon
Fluorescent Dyes
Magnetic Phenomena
Mercury*
Nanocomposites*
Quantum Dots*
Spectrometry, Fluorescence

Substances

Fluorescent Dyes
Carbon
Mercury