Abstract
An adept, rapid and novel water-soluble glutathione functionalized CdS quantum dots (GSH@CdS QDs) were fabricated using green pathway for sensing of heavy metal contamination prevalent in industrial wastewater. GSH@CdS QDs were facilely synthesized in an aqueous phase reaction and were effectively characterized using FT-IR, XRD, FESEM, HRTEM and EDX techniques. The distinct fluorescence characteristics of GSH@CdS QDs were explored and the QDs showed selective sensitivity towards mercury ions with a low limit of detection of 0.54 nM under optimal conditions. The detailed interaction between GSH@CdS QDs and Hg2+ and the probable fluorescence quenching mechanism were established in this study. In comparison to already reported fluorescent probes, GSH@CdS QDs showed high sensitivity, biocompatibility, long fluorescence stability and convenient removal of mercury ions.
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Acknowledgements
The authors are highly gratified towards Innovative in Science Pursuit for Inspired Research (INSPIRE) (DST/INSPIRE Fellowship/2017/IF170903) and Department of Science and Technology (DST) (Grant No. SEED/TIASN/008/2018/G and DST/TMD(EWO)/OWUIS-2018/RS-15(G)) and Technical Education Quality Improvement Program (TEQIP)-III, SSBUICET for providing necessary financial support; Sophisticated Analytical Instrumentation Facility (SAIF-CIL), Panjab University, Chandigarh for the sample characterization.
Funding
The authors are highly gratified towards Innovative in Science Pursuit for Inspired Research (DST/INSPIRE Fellowship/2017/IF170903) and Department of Science and Technology (Grant No. SEED/TIASN/008/2018/G and DST/TMD(EWO)/OWUIS-2018/RS-15(G)) and Technical Education Quality Improvement Program (TEQIP)-III, SSBUICET for providing necessary financial support.
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Research Highlights
• Fabrication of eco-friendly and biocompatible fluorescent GSH@CdS QDs sensor
• Selective detection of Hg2+ even at a low concentration of 0.54 nM
• Two different quenching mechanism were explored for the fluorescence quenching of GSH@CdS QDs at low and high concentration of Hg2+ ions
• Selective sensing of Hg2+ ions in real water samples
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Kaur, J., Komal, Renu et al. Glutathione Modified Fluorescent CdS QDs Synthesized Using Environmentally Benign Pathway for Detection of Mercury Ions in Aqueous Phase. J Fluoresc 30, 773–785 (2020). https://doi.org/10.1007/s10895-020-02545-8
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DOI: https://doi.org/10.1007/s10895-020-02545-8