Carbon dots-magnetic nanocomposites for the detection and removal of Hg2
Ruyan Xie1, Yaoyao Qu1, Mingyu Tang1
1Key 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.
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.
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