Voltammetry determination of Cd(II) and Pb(II) at TiO2/reduced graphene oxide modified electrodes

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2024-04-15 DOI:10.1002/vjch.202300303

N. Luyen, Tran Thanh Tam Toan, Nguyen Mau Thanh

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引用次数: 0

Abstract

In this article, a TiO2/reduced graphene oxide (rGO) composite was synthesized from rGO and soluble titanium hydroxide‐peroxide complexes. The obtained materials were characterized by X‐ray diffraction, scanning electron microscopy, nitrogen adsorption/desorption, Raman spectroscopy and energy dispersive X‐ray spectroscopy‐elementary mapping. The TiO2/rGO composite was used as an electrode modifier for developing an electrochemical sensor to simultaneous analysis of Cd(II) and Pb(II) by using differential pulse anodic stripping voltammetry (DP‐ASV). Under optimal conditions, the linear correlation between the stripping peak current and the metal ion concentration is good in the range of 5–100 ppb for both metals (R2 ≥ 0.998), and a low detection limit (3.17 ppb for Cd(II) and 2.42 ppb for Pb(II)) was obtained. The interference study revealed that some metal cations had little influence on the DP‐ASV signals of Cd(II) and Pb(II). In addition, the developed electrode exhibited satisfied reproducibility and repeatability. The TiO2/rGO‐modified electrode was tested toward the detection of Cd(II) and Pb(II) in river waters and the obtained exceptional recoveries and results were further associated with AAS results. This study indicates that the TiO2/rGO composite might be an alternative for practical applications in the electrochemical determination of heavy metal ions in aquatic solutions.

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在 TiO2/还原氧化石墨烯修饰电极上测定镉（II）和铅（II）的伏安法测定结果

本文利用 rGO 和可溶性氢氧化钛-过氧化物复合物合成了 TiO2/还原氧化石墨烯（rGO）复合材料。通过 X 射线衍射、扫描电子显微镜、氮吸附/解吸、拉曼光谱和能量色散 X 射线光谱-元素图谱对所获材料进行了表征。将 TiO2/rGO 复合材料用作电极改性剂，开发了一种电化学传感器，利用差分脉冲阳极剥离伏安法（DP-ASV）同时分析镉（II）和铅（II）。在最佳条件下，两种金属的剥离峰电流与金属离子浓度在 5-100 ppb 范围内呈良好的线性相关（R2 ≥ 0.998），并获得了较低的检测限（镉（II）为 3.17 ppb，铅（II）为 2.42 ppb）。干扰研究表明，一些金属阳离子对 Cd(II) 和 Pb(II) 的 DP-ASV 信号影响很小。此外，所开发的电极具有良好的重现性和重复性。对经 TiO2/rGO 修饰的电极进行了河水中镉(II)和铅(II)的检测试验，所获得的优异回收率和结果与 AAS 的结果有进一步的联系。这项研究表明，TiO2/rGO 复合材料可能是实际应用于水溶液中重金属离子电化学测定的一种替代方法。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.