Journal
CHINESE JOURNAL OF ANALYTICAL CHEMISTRY
Volume 42, Issue 9, Pages 1252-1258Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/S1872-2040(14)60765-9
Keywords
Carbon quantum dots; Green synthesis; Apple juice; Hg2+
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Funding
- National Natural Science Foundation of China [21175118, 21275130]
- National Students' Innovation and Entrepreneurship Training Program of Zhejiang Normal University, China [201310345020]
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Fluorescent carbon quantum dots (CQDs) were synthesized by one-step hydrothermal treatment with apple juice as raw material. The result indicated that the fluorescence could be quenched by Hg2+ with high specificity. Based on this phenomenon, a selective and sensitive sensor was constructed for the detection of Hg2+ in phosphate solutions (pH 7.0). The fluorescence intensity showed linear responses with Hg2+ concentration ranging from 5.0 to 100.0 nM and 1.0 to 50.0 mu M, with the detection limit of 2.3 nM (S/N = 3). The as-fabricated sensor was further extended for the determination of Hg2+ in real water samples.
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