Carbon quantum dots prepared with polyethyleneimine as both reducing agent and stabilizer for synthesis of Ag/CQDs composite for Hg2+ ions detection
In: Journal of Hazardous Materials, Jg. 322 (2017), S. 430-436
Online
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Zugriff:
A stable silver nanoparticles/carbon quantum dots (Ag/CQDs) composite was prepared by using CQDs as reducing and stabilizing agent. The CQDs synthesized with polyethyleneimine (PEI) showed an extraordinary reducibility. When Hg2+ was presented in the Ag/CQDs composite solution, a color change from yellow to colorless was observed, accompanied by a shift of surface plasmon resonance (SPR) band and decrease in absorbance of the Ag/CQDs composite. On the basis of the further studies on TEM, XPS and XRD analysis, the possible mechanism is attributed to the formation of a silver-mercury amalgam. Hence, a two dimensional sensing platform for Hg2+ detection was constructed upon the Ag/CQDs composite. Based on the change of absorbance, a good linear relationship was obtained from 0.5 to 50μM for Hg2+. And the limit of detection for Hg2+ was as low as 85nM, representing high sensitivity to Hg2+. More importantly, the proposed method also exhibits a good selectivity toward Hg2+ over other metal ions. Besides, this strategy demonstrates practicability for the detection of Hg2+ in real water samples with satisfactory results.
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Carbon quantum dots prepared with polyethyleneimine as both reducing agent and stabilizer for synthesis of Ag/CQDs composite for Hg2+ ions detection
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Autor/in / Beteiligte Person: | Nian Bing Li ; Shu Min Lin ; Shi Gang Liu ; Yu Zhu Fan ; Jing Lie Lei ; Liu, Ting ; Hong Qun Luo ; Li, Na ; Jiang Xue Dong |
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Zeitschrift: | Journal of Hazardous Materials, Jg. 322 (2017), S. 430-436 |
Veröffentlichung: | Elsevier BV, 2017 |
Medientyp: | unknown |
ISSN: | 0304-3894 (print) |
DOI: | 10.1016/j.jhazmat.2016.10.034 |
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