A sensitive electrochemical sensor using an iron oxide/graphene composite for the simultaneous detection of heavy metal ions
A sensitive electrochemical sensor using an iron oxide/graphene composite for the simultaneous detection of heavy metal ions
复制标题
DOI：
10.1016/j.talanta.2016.07.034
复制
发表时间：
2016-11-01
期刊：
影响因子：
6.1
通讯作者：
Piao, Yuanzhe
中科院分区：
文献类型：
--
作者：
Lee, Sohee;Oh, Jiseop;Piao, Yuanzhe
我们报告了氧化铁（Fe 2 O3）/石墨烯（G）纳米复合电极与原位镀铋（Bi）组合用作测定痕量Zn 2+、Cd 2+和Pb 2+的电化学传感器的分析评估。采用透射电子显微镜、扫描电子显微镜、热重分析仪和X射线衍射仪对复合材料进行了表征。研究了Fe 2 O3/G/Bi复合修饰电极的电化学性能。微分脉冲阳极溶出伏安法用于金属离子的检测。由于石墨烯和Fe 2 O3纳米粒子之间的协同效应，修饰电极对痕量重金属离子表现出更高的电催化活性和灵敏度。对富集电位、铋浓度、富集时间和pH等参数进行了优化，确定了目标金属离子。在优化条件下，电极对Zn 2+、Cd 2+和Pb 2+的线性范围为1-100 μ g L-1，检出限分别为0.11 μ g L-1、0.08 μ g L-1和0.07 μ g L-1（S/N = 3）。对于单个传感器，10次测量的重复性（% RSD）分别为1.68%（Zn 2+）、0.92%（Cd 2+）和1.69%（Pb 2+）;对于5个不同电极，Zn 2+、1.15%（Cd 2+）和0.91%（Pb 2+）的重复性分别为0.89%、1.15%和0.91%。将该电极成功地应用于真实的样品中痕量金属离子的分析。无溶剂热分解法合成纳米复合电极材料简单易行，可推广应用于纳米复合材料的合成和重金属离子测定的电极材料。(C)© 2016 Elsevier B. V.版权所有。
We report an analytical assessment of an iron oxide (Fe2O3)/graphene (G) nanocomposite electrode used in combination with in situ plated bismuth (Bi) working as an electrochemical sensor for the determination of trace Zn2+, Cd2+, and Pb2+. The as-synthesized nanocomposites were characterized by transmission electron microscopy, scanning electron microscopy, thermo-gravimetric analyzer, and X-ray diffraction. The electrochemical properties of the Fe2O3/G/Bi composite modified electrode were investigated. Differential pulse anodic stripping voltammetry was applied for the detection of metal ions. Due to the synergetic effect between graphene and the Fe2O3 nanoparticles, the modified electrode showed improved electrochemical catalytic activity high sensitivity toward trace heavy metal ions. Several parameters such as the preconcentration potential, bismuth concentration, preconcentration time, and pH were carefully optimized to determine the target metal ions. Under optimized conditions, the linear range of the electrode was 1-100 mu g L-1 for Zn2+, Cd2+, and Pb2+, and the detection limits were 0.11 mu g L-1, 0.08 mu g L-1, and 0.07 mu g L-1, respectively (S/N = 3). Repeatability (% RSD) was found to be 1.68% for Zn2+, 0.92% for Cd2+, and 1.69% for Pb2+ for single sensor with 10 measurements and 0.89% for Zn2+, 1.15% for Cd2+, and 0.91% for Pb2+ for 5 different electrodes. The Fe2O3/G/Bi composite electrode was successfully applied to the analysis of trace metal ions in real samples. The solventless thermal decomposition method applied to the simple and easy synthesis of nanocomposite electrode materials can be extended to the synthesis of nanocomposites and promising electrode materials for the determination of heavy metal ions. (C) 2016 Elsevier B.V. All rights reserved.