Development of an origami paper-based electrochemical sensor using N-doped graphene for simultaneous detection of Cd(II), Pb(II), and Hg(II) in water

文献类型： 外文期刊

第一作者： Wei, Jiaqi

作者： Wei, Jiaqi;Wang, Linzhe;Hu, Jingfang;Yang, Yangchun;Song, Yu;Li, Yansheng;Gao, Guowei;Wang, Linzhe;Wei, Wensong;Hu, Jingfang;Song, Yu;Li, Yansheng;Gao, Guowei

作者机构：

关键词： N -doped graphene; Electrochemical sensor; Microfluidic paper-based analytical device; Simultaneous detection; Heavy metal ions

期刊名称：MICROCHEMICAL JOURNAL （ 影响因子：5.1； 五年影响因子：4.7 ）

ISSN： 0026-265X

年卷期： 2025 年 212 卷

页码：

收录情况： SCI

摘要： Heavy metals expose great hazards to the ecological environment and public health due to their high toxicity and non-biodegradability. In this work, a low-cost, portable origami electrochemical microfluidic paper-based analytical device (E mu PAD) was developed using nitrogen-doped graphene (NG) for simultaneous detection of Cd(II), Pb(II), and Hg(II) in water. The origami structure functions as a valve between sample introduction and detection, reducing sample volume and enhancing operation convenience. Electrochemical linear scanning voltammetry was employed for the first time in the in-situ synthesis of NG on paper-based electrode for sensing heavy metal ions. With its large specific surface area and numerous active sites, NG-modified electrodes exhibited excellent analytical performance for simultaneous determination of Cd(II), Pb(II), and Hg(II). The E mu PAD sensor exhibited a wide linear response ranging from 5 to 100 mu g/L, and low detection limits (Cd(II): 0.5698 mu g/L, Pb(II): 0.4024 mu g/L, Hg(II): 0.2565 mu g/L,), which were well below the drinking water standards. Additionally, the E mu PAD has been successfully applied to real water samples, achieving recoveries of 96.4 % similar to 106.2 % with RSDs below 7 %.

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