Determination of uranium in environmental sample by nanosensor graphene quantum dots
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The unique properties of graphene quantum dots (GQDs) i.e. low toxicity, excellent water solubility, low cost, high photostability, biocompatibility, and small size have attracted tremendous attention for new research prospects in the detection of metal ions. The fluorescence properties of GQDs are used for qualitative and quantitative analysis of U(VI) ion. The fluorescence of GQDs is intensively quenched by uranium. Synthesized GQDs were characterized by UV–visible spectroscopy, FTIR, Transmission electron microscopy, fluorescence spectrophotometry. Results indicate a single layer of GQDs, small size. Optimum pH is 7 for uranium detection and up to 1.5 ppb of U(VI) ion is accurately determined.
KeywordsGraphene quantum dots Uranium ion Fluorescence spectroscopy Pyrolysis Glucose
The authors are thankful to Dr. A. M. Rawani, Director, National Institute of Technology Raipur for laboratory and library facilities. One of the author Pradeep Kumar Dewangan gratefully acknowledges the JRF awarded by Council of Scientific and Industrial Research (CSIR) (Grant No. 09/1116(0001)2016-EMR-I), New Delhi.
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