Abstract In this study, a sensitive and reliable anodic stripping voltammetry (ASV) using a series of multiwall carbon nanotube modified by antimony oxide (Sb2O3/MWCNTs) paste electrodes was successfully introduced for the simultaneous electrochemical detection of Cd2+ and Pb2+ ions. Firstly, a composite of multiwall carbon nanotubes (MWCNTs) was successfully used to preparing a paste electrode. Then, the MWCNTs bulk electrode was further modified with various concentrations of Sb2O3 (1, 3, and 4 wt.%, respectively) for improving the cadmium ions (Cd2+) and lead ions (Pb2+) detection ability. Among the Sb2O3/MWCNTs electrodes, the modified electrode by 3 wt.% Sb2O3 exhibits remarkable analytical detection for Cd2+ and Pb2+ by linear sweep anodic stripping voltammetry (LSASV) technique. The proper linear curves of current response versus the concentration of Cd2+ (80–150 ppb) and Pb2+ (5–35 ppb) could be observed. Interestingly, the analytical sensitivity of the mixture Cd2+ and Pb2+ were 1.932 and 2.694 μA⋅L⋅μg–1, respectively, which were higher than 1.5 and 1.3 folds of the individual ions. It expects that the Sb2O3/MWCNTs paste electrode could provide a significant improvement to the electrode for the simultaneous electrochemical detection of Cd2+ and Pb2+ ions.

中文翻译：

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氧化锑 (Sb2O3/MWCNTs) 糊状电极修饰的多壁碳纳米管用于同时电化学检测镉和铅离子

摘要 在本研究中，成功​​引入了使用一系列氧化锑修饰的多壁碳纳米管 (Sb2O3/MWCNTs) 糊状电极的灵敏可靠的阳极溶出伏安法 (ASV)，用于同时电化学检测 Cd2+ 和 Pb2+ 离子。首先，多壁碳纳米管（MWCNTs）的复合材料成功地用于制备糊状电极。然后，用不同浓度的 Sb2O3（分别为 1、3 和 4 wt.%）对 MWCNTs 体电极进行进一步修饰，以提高镉离子 (Cd2+) 和铅离子 (Pb2+) 的检测能力。在 Sb2O3/MWCNTs 电极中，含有 3 wt.% Sb2O3 的修饰电极通过线性扫描阳极溶出伏安法 (LSASV) 技术对 Cd2+ 和 Pb2+ 表现出显着的分析检测。可以观察到电流响应与 Cd2+ (80–150 ppb) 和 Pb2+ (5–35 ppb) 浓度的适当线性曲线。有趣的是，混合物 Cd2+ 和 Pb2+ 的分析灵敏度分别为 1.932 和 2.694 μA⋅L⋅μg–1，高于单个离子的 1.5 和 1.3 倍。预计Sb2O3/MWCNTs糊状电极可以显着改善电极同时电化学检测Cd2+和Pb2+离子。