阳极溶出伏安法
检出限
电化学气体传感器
电化学
煅烧
循环伏安法
材料科学
剥离(纤维)
吸附
蚀刻(微加工)
化学
分析化学(期刊)
电极
纳米技术
色谱法
图层(电子)
有机化学
催化作用
复合材料
物理化学
生物化学
作者
Xueping Zhang,Qingqing Wang,Jing Li,Liang Huang,Dengbin Yu,Shaojun Dong
出处
期刊:Analyst
[The Royal Society of Chemistry]
日期:2018-01-01
卷期号:143 (12): 2837-2843
被引量:27
摘要
In this work, a novel electrochemical sensor for Cd(ii) detection with differential pulse anodic stripping voltammetry (DPASV) is fabricated based on hollow ZnO@nitrogen-doped carbon (H-ZnO@NC) polyhedra, which are prepared from ZIF-8 via in situ tannic acid etching and a subsequent calcination process. The as-obtained H-ZnO@NC exhibits a polyhedral morphology with a well-defined hollow structure and a uniform distribution of elements C, N, O, and Zn in the shell. The unique structure of H-ZnO@NC can provide an enlarged surface area and abundant active sites. Moreover, ZnO has a strong affinity for heavy metals, which can enhance the adsorption capacity of H-ZnO@NC for Cd(ii) in the accumulation step of stripping voltammetry, and thus improve the electrochemical sensing performances. As expected, the H-ZnO@NC-based sensor achieves a wide linear range of 0.3-300 μg L-1, a low detection limit of 0.1 μg L-1 (S/N = 3), and exhibits good selectivity as well as high stability and reproducibility. Moreover, the proposed electrochemical sensor can be applied for the determination of Cd(ii) in real water samples, obtaining satisfactory results.
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