期刊
APPLIED SURFACE SCIENCE
卷 445, 期 -, 页码 519-526出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apsusc.2018.03.156
关键词
Graphene quantum dots; Doping; Coal-derived; The detection of trace metals
类别
资金
- National Natural Science Foundation of China [51602001, 21676001]
- Key Science and Technology Special Projects of Anhui Province [15czz02045]
- Nature Science Research Project of Anhui province [1608085QE106, KJ2015A129]
- National Key Research and Development Plan of Intergovernmental International Scientific and Technological Innovation Cooperation [2016YFE0108400]
N, P, S co-doped graphene quantum dots (NPS-GQDs) were prepared via a one-step wet chemical plus dialysis method directly using anthracite coal as raw material. This facile oxidation process simultaneously synthesized graphene quantum dots (GQDs) and doped N, P and S atoms on edges or forming functional groups of GQDS. X-ray photoelectron spectroscopy (XPS) proved that the involved heteroatoms were successfully doped on GQDs. The local doping of N, P and S on GQDs can reach high levels as 5.6%, 3.7% and 3.7% (by atomic) during XPS detection, respectively. Raman spectra showed that the amount of defects or disorders of prepared GQDs increased during the transition of the coal hunk toward the nano-GQDs. The effect of graphitizing degree of applied coals (varied coal ranks) on the formation of GQDs implied that raw coals with too high or too low graphitizing degree were not optimizing for the formation of high-quality GQDs. The prepared NPS-GQDs showed excellent properties on the excitation-dependent fluorescence and the quench by some trace metals. Thus, the NPS-GQDs were applied to detect of Pb2+ in both a DI water and a multi-elements analysis matrix, exhibited wide linear detection range (1-20 mu M) and a detection limit of 0.75 mu M. (C) 2018 Elsevier B.V. All rights reserved.
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