A facile synthesis of magnetic fluorescence FeO-carbon dots for the detection and removal of Hg

• Published in: New journal of chemistry 2020-04, Vol.44 (16), p.6635-6642
• Main Authors: Tang, Mingyu, Ren, Guojuan, Chai, Fang
• Format: Article
• Language: English
• ISSN: 1144-0546; 1369-9261
• DOI: 10.1039/d0nj00275e

This article reports a one-pot hydrothermal strategy for preparing fluorescence carbon dots with magnetic properties (Fe 3 O 4 -CDs). Ammonium ferric citrate (AFC) and urea served as the iron and nitrogen sources and both as carbon sources were put into the reaction solvent diethylenetriamine (DETA), which acted as a reductant and nitrogen provider in the process of the synthesis of Fe 3 O 4 -CDs. Further, a sensitive and rapid method based on the Fe 3 O 4 -CDs was utilized for the detection of Hg 2+ , simultaneously accompanied with a magnetic removal process. Good linearity was obtained in the range from 2.0 to 200.0 nM with a detection limit of 12.6 nM. The fluorescence quenching mechanism was proved to be caused by an inner-filter effect (IFE) and static quenching effect (SQE). More, this platform was successfully applied for the analysis of Hg 2+ in a real sample with satisfying recovery results, thus demonstrating its utility as a convenient monitoring strategy. This article reports a one-pot hydrothermal strategy for preparing fluorescence carbon dots with magnetic properties (Fe 3 O 4 -CDs). The Fe 3 O 4 -CDs can be utilized for the detection of Hg 2+ , simultaneously accompanied with a magnetic removal process.