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Efficient Detection of Trace Hg2+ in Water Based on the Fluorescence Quenching of Environment-friendly Thiolfunctionalized Poly(vinyl alcohol) Capped CdS Quantum Dots Nanocomposite

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Using environment-friendly materials for sensing toxic metal ions has drawn significant attention in recent research. Herein, we present an aqueous synthesis of stable CdS quantum dots (QDs) using thiol-functionalized poly(vinyl alcohol) (PVA) as the unique capping ligand for the detection of trace Hg2+ in environmental water samples. The CdS QDs with an average size of 3.3 nm had good water-solubility and favorable fluorescence with a quantum yield of 32.8% and a longer luminescence lifetime of 31.9 ns. The fluorescence intensity of QDs aqueous solution in the 520 nm wavelength was quenched upon the addition of Hg2+. Under the optimal conditions, the ratio of the blank fluorescence intensity to the quenched fluorescence intensity was linearly proportional to the Hg2+concentration from 2 to 4000 nM with a detection limit of 1 nM. Also, many co-existing metal ions were not interfered with the detection of Hg2+. This nanomaterial was successfully applied to the measurement of Hg2+ in water samples.

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Authors and Affiliations

  1. Key Laboratory of Eco-Environment-Related Polymer Materials Ministry of Education, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, 730070, P. R. China

    Xiaolin Guan, Hongting Fan, Shoujun Lai & Ziqiang Lei

  2. Key Laboratory of Polymer Materials Ministry of Gansu Province, College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu, 730070, P. R. China

    Xiaolin Guan, Yang Zhang, Donghai Zhang, Tianming Jia & Shoujun Lai

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  1. Xiaolin Guan
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  2. Hongting Fan
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  3. Yang Zhang
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  4. Donghai Zhang
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  5. Tianming Jia
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  6. Shoujun Lai
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  7. Ziqiang Lei
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Correspondence to Shoujun Lai.

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Guan, X., Fan, H., Zhang, Y. et al. Efficient Detection of Trace Hg2+ in Water Based on the Fluorescence Quenching of Environment-friendly Thiolfunctionalized Poly(vinyl alcohol) Capped CdS Quantum Dots Nanocomposite. ANAL. SCI. 32, 161–165 (2016). https://doi.org/10.2116/analsci.32.161

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  • DOI: https://doi.org/10.2116/analsci.32.161

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