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基于碳质纳米材料和FeO纳米颗粒的传感器对镉、铅、铜和汞的电化学检测

Electrochemical Detection of Cd, Pb, Cu and Hg with Sensors Based on Carbonaceous Nanomaterials and FeO Nanoparticles.

作者信息

Dinu Iacob Ancuța, Bounegru Alexandra Virginia, Iticescu Catalina, Georgescu Lucian P, Apetrei Constantin

机构信息

Department of Chemistry, Physics and Environment, Faculty of Sciences and Environment, "Dunărea de Jos" University of Galati, 47 Domneasca Street, 800008 Galați, Romania.

出版信息

Nanomaterials (Basel). 2024 Apr 18;14(8):702. doi: 10.3390/nano14080702.

DOI:10.3390/nano14080702
PMID:38668196
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC11053428/
Abstract

Two electrochemical sensors were developed in this study, with their preparations using two nanomaterials with remarkable properties, namely, carbon nanofibers (CNF) modified with FeO nanoparticles and multilayer carbon nanotubes (MWCNT) modified with FeO nanoparticles. The modified screen-printed electrodes (SPE) were thus named SPE/FeO-CNF and SPE/FeO-MWCNT and were used for the simultaneous detection of heavy metals (Cd, Pb, Cu and Hg). The sensors have been spectrometrically and electrochemically characterized. The limits of detection of the SPE/FeO-CNF sensor were 0.0615 μM, 0.0154 μM, 0.0320 μM and 0.0148 μM for Cd, Pb, Cu and Hg, respectively, and 0.2719 μM, 0.3187 μM, 1.0436 μM and 0.9076 μM in the case of the SPE/ FeO-MWCNT sensor (following optimization of the working parameters). Due to the modifying material, the results showed superior performance for the SPE/FeO-CNF sensor, with extended linearity ranges and detection limits in the nanomolar range, compared to those of the SPE/FeO-MWCNT sensor. For the quantification of heavy metal ions Cd, Pb, Cu and Hg with the SPE/FeO-CNF sensor from real samples, the standard addition method was used because the values obtained for the recovery tests were good. The analysis of surface water samples from the Danube River has shown that the obtained values are significantly lower than the maximum limits allowed according to the quality standards specified by the United States Environmental Protection Agency (USEPA) and those of the World Health Organization (WHO). This research provides a complementary method based on electrochemical sensors for in situ monitoring of surface water quality, representing a useful tool in environmental studies.

摘要

本研究开发了两种电化学传感器，其制备使用了两种具有显著特性的纳米材料，即FeO纳米颗粒修饰的碳纳米纤维（CNF）和FeO纳米颗粒修饰的多层碳纳米管（MWCNT）。由此，修饰后的丝网印刷电极（SPE）分别命名为SPE/FeO-CNF和SPE/FeO-MWCNT，并用于同时检测重金属（Cd、Pb、Cu和Hg）。这些传感器已通过光谱和电化学方法进行了表征。SPE/FeO-CNF传感器对Cd、Pb、Cu和Hg的检测限分别为0.0615 μM、0.0154 μM、0.0320 μM和0.0148 μM，而SPE/FeO-MWCNT传感器（在工作参数优化后）的检测限分别为0.2719 μM、0.3187 μM、1.0436 μM和0.9076 μM。由于修饰材料的原因，结果表明SPE/FeO-CNF传感器具有更优异的性能，与SPE/FeO-MWCNT传感器相比，其线性范围更宽，检测限在纳摩尔范围内。对于使用SPE/FeO-CNF传感器对实际样品中的重金属离子Cd、Pb、Cu和Hg进行定量分析，采用了标准加入法，因为回收率测试获得的值良好。对多瑙河地表水样品的分析表明，所获得的值明显低于美国环境保护局（USEPA）和世界卫生组织（WHO）规定的质量标准所允许的最大限值。本研究提供了一种基于电化学传感器的补充方法，用于原位监测地表水水质，是环境研究中的一种有用工具。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/c34a/11053428/6469af23b2bd/nanomaterials-14-00702-g011.jpg
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