Rapid detection of heavy metal ions based on a novel BMIMPF6-MWCNTs/GCE sensor and square wave voltammetry in actual water samples

文献类型： 外文期刊

第一作者： Feng, Shaobiao

作者： Feng, Shaobiao;Yang, Lijuan;Yan, Lili;Zhu, Miao;Xu, Honglei;Li, Gangfeng;Feng, Shaobiao;Yang, Lijuan

作者机构：

关键词： Electrochemical sensor Multiwalled carbon nanotubes; Hydrophobic ionic liquid Heavy metal ions Actual water samples

期刊名称：JOURNAL OF APPLIED ELECTROCHEMISTRY （ 影响因子：2.9； 五年影响因子：2.8 ）

ISSN： 0021-891X

年卷期： 2024 年

页码：

收录情况： SCI

摘要： A novel electrochemical sensor based on multiwalled carbon nanotubes (MWCNTs) and 1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF6) hydrophobic ionic liquid for the rapid detection of Pb2+ and Cd2+ was developed. In this study, the BMIMPF6-MWCNTs composite, as well as BMIMPF6 and MWCNTs, were characterized using SEM. The electrochemical studies were performed using Cyclic Voltammetry (CV) and Electrochemical Impedance Spectroscopy (EIS). The BMIMPF6-MWCNTs/GCE exhibited excellent electrochemical activity. The effect of the pH value of 0.1 M NaAc/HAc buffer, deposition potential, and deposition time was investigated. Under the optimal conditions, the linear range for the modified sensors varies from 5 to 1850 mu g L-1 for Pb2+ and 22 to 600 mu g L-1 for Cd2+. The limit of detection (LOD) for Pb2+ and Cd2+ was 0.9 mu g L-1 and 0.5 mu g L-1, respectively, and the limit of quantification (LOQ) was 3 mu g L-1 for Pb2+ and 1.7 mu g L-1 for Cd2+. Moreover, this method showed excellent anti-interference performance, short analysis time, and practicability for determining Pb2+ and Cd2+. The electrochemical sensor was able to determine heavy metal ions in actual water samples without complex pretreatment, with acceptable recoveries from 98 to 110.8% for Pb2+ and 98.6 to 111.3% for Cd2+, demonstrating that the sensor based on BMIMPF6-MWCNTs/GCE can apply for Pb2+ and Cd2+ quantification.

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