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一种基于氧化石墨烯修饰的二元过渡金属氧化物BiO/MnO的高效伏安传感器用于痕量铅离子的测定。

An Efficient Voltammetric Sensor Based on Graphene Oxide-Decorated Binary Transition Metal Oxides BiO/MnO for Trace Determination of Lead Ions.

作者信息

Li Guangli, Qi Xiaoman, Xiao Yang, Zhao Yuchi, Li Kanghua, Xia Yonghui, Wan Xuan, Wu Jingtao, Yang Chun

机构信息

College of Life Sciences and Chemistry, Hunan University of Technology, Zhuzhou 412007, China.

Department of Neurology, Zhuzhou People's Hospital, Zhuzhou 412008, China.

出版信息

Nanomaterials (Basel). 2022 Sep 23;12(19):3317. doi: 10.3390/nano12193317.

DOI:10.3390/nano12193317
PMID:36234444
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC9565483/
Abstract

Herein we present a facile synthesis of the graphene oxide-decorated binary transition metal oxides of BiO and MnO nanocomposites (BiO/MnO/GO) and their applications in the voltammetric detection of lead ions (Pb) in water samples. The surface morphologies, crystal structures, electroactive surface area, and charge transferred resistance of the BiO/MnO/GO nanocomposites were investigated through the scanning electron microscopy (SEM), power X-ray diffraction (XRD), cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) techniques, respectively. The BiO/MnO/GO nanocomposites were further decorated onto the surface of a glassy carbon electrode (GCE), and Pb was quantitatively analyzed by using square-wave anodic stripping voltammetry (SWASV). We explored the effect of the analytical parameters, including deposition potential, deposition time, and solution pH, on the stripping peak current of Pb. The BiO/MnO/GO nanocomposites enlarged the electroactive surface area and reduced the charge transferred resistance by significant amounts. Moreover, the synergistic enhancement effect of MnO, BiO and GO endowed BiO/MnO/GO/GCE with extraordinary electrocatalytic activity toward Pb stripping. Under optimal conditions, the BiO/MnO/GO/GCE showed a broad linear detection range (0.01-10 μM) toward Pb detection, with a low limit of detection (LOD, 2.0 nM). The proposed BiO/MnO/GO/GCE electrode achieved an accurate detection of Pb in water with good recoveries (95.5-105%).

摘要

在此，我们展示了一种简便的合成方法，用于制备氧化石墨烯修饰的BiO和MnO二元过渡金属氧化物纳米复合材料（BiO/MnO/GO）及其在水样中铅离子（Pb）伏安检测中的应用。分别通过扫描电子显微镜（SEM）、粉末X射线衍射（XRD）、循环伏安法（CV）和电化学阻抗谱（EIS）技术研究了BiO/MnO/GO纳米复合材料的表面形貌、晶体结构、电活性表面积和电荷转移电阻。将BiO/MnO/GO纳米复合材料进一步修饰在玻碳电极（GCE）表面，并采用方波阳极溶出伏安法（SWASV）对Pb进行定量分析。我们探讨了沉积电位、沉积时间和溶液pH值等分析参数对Pb溶出峰电流的影响。BiO/MnO/GO纳米复合材料显著扩大了电活性表面积并降低了电荷转移电阻。此外，MnO、BiO和GO的协同增强效应赋予BiO/MnO/GO/GCE对Pb溶出具有非凡的电催化活性。在最佳条件下，BiO/MnO/GO/GCE对Pb检测显示出宽线性检测范围（0.01 - 10 μM），检测限低（LOD，2.0 nM）。所提出的BiO/MnO/GO/GCE电极实现了对水中Pb的准确检测，回收率良好（95.5 - 105%）。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5363/9565483/dfee5c4e418c/nanomaterials-12-03317-g008.jpg
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