期刊
JOURNAL OF HAZARDOUS MATERIALS
卷 322, 期 -, 页码 430-436出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2016.10.034
关键词
Silver nanoparticles; Carbon quantum dots; Polyethyleneimine; Surface plasmon resonance; Hg2+
资金
- National Natural Science Foundation of China [21273174]
- Municipal Science Foundation of Chongqing City [CSTC-2013jjB00002, CSTC-2015jcyjB50001]
A stable silver nanoparticlesicarbon 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 50 mu M for Hg2+. And the limit of detection for Hg2+ was as low as 85 nM, 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. (C) 2016 Elsevier B.V. All rights reserved.
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