Graphene quantum dots doped with sulfur and nitrogen as versatile electrochemical sensors for heavy metal ions Cd(II), Pb(II), and Hg(II)

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作者

Saisree Sadasivakurup¹ , Sandhya Karunakaran Yesodha¹ , Arya Nair Jayadharan Salini¹

1. Indian Institute of Space Science and Technology

会议/活动

35th Kerala Science Congress, February 2023 (Kuttikanam, India)

海报摘要

A sulfur co-doped nitrogen-graphene quantum dot was synthesized from polyaniline using sulfuric acid as an acid catalyst and S-doping agent through a simple hydrothermal synthesis. The S,N-GQDs, for the first time, exhibited simultaneous sensing toward three of the top 10 toxic metal ions: Cd(II), Pb(II), and Hg(II) with highly sharp peaks and adequate peak-to-peak separation. The detection limit values were lowest hitherto for Cd(II), Pb(II), and Hg(II) on S,N-GQD with 1, 10, and 1 pM, respectively, for the simultaneous sensing of the metal ions. The significantly enhanced (~7-fold) sensitivity compared to that of N-GQD for Cd(II) and the simultaneous sensing capability of S,N-GQD is assigned to the co-doping with S, which enabled the sensing of Pb(II) and Hg(II) through the M(II)−S interactions and the enhanced electronic properties, respectively. Further, the actual environmental water sample studies accomplished ∼100% recovery in all the tested samples with a relative standard deviation of ≤0.5%.

关键词

Graphene quantum dot, Electrochemical sensing, Lowest detection limit, Heteroatom doping, Heavy metal ions, Simultaneous sensing

研究领域

Chemistry

参考文献

1. Saisree S, Arya Nair J. S, and Sandhya Karunakaran Yesodha, ‘Graphene Quantum Dots Doped with Sulfur and Nitrogen as Versatile Electrochemical Sensors for Heavy Metal Ions Cd(II), Pb(II), and Hg(II)’. ACS Applied Nano Materials, January 2023.
2. Aswathi Ramachandran, Arya Nair J S, and Sandhya Karunakaran Yesodha,'Polyaniline-Derived Nitrogen-Doped Graphene Quantum Dots for the Ultratrace Level Electrochemical Detection of Trinitrophenol and the Effective Differentiation of Nitroaromatics: Structure Matters'. ACS Sustainable Chemistry and Engineering, March 2019.

基金

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补充材料

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附加信息

利益冲突

No competing interests were disclosed.

数据可用性声明

The datasets generated during and / or analyzed during the current study are available from the corresponding author on reasonable request.

知识共享许可协议

Copyright © 2023 Sadasivakurup et al. This is an open access work distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.