电催化剂
纳米复合材料
电化学
吸附
共价有机骨架
检出限
化学工程
电化学气体传感器
催化作用
材料科学
碳纳米管
共价键
电极
纳米技术
化学
色谱法
物理化学
有机化学
工程类
作者
Fei Pan,Chunyi Tong,Ning Wang,Yeyao Wang,Dawei Pan,Rilong Zhu
出处
期刊:ACS Sustainable Chemistry & Engineering
[American Chemical Society]
日期:2022-11-18
卷期号:10 (48): 16027-16036
被引量:9
标识
DOI:10.1021/acssuschemeng.2c05690
摘要
The weak conductivity of covalent organic frameworks (COFs) limits their wide application in electrochemical sensors. Here, a novel electrochemical sensor (AuNFs/COF-SH/CNTs/GCE) was designed and constructed by a one-step electrochemical deposition of Au nanoflowers (AuNFs) on a hybrid nanocomposite of sulfhydryl-functional covalent organic framework/carbon nanotubes (COF-SH/CNTs) for the determination of Cu(II) in seawater. AuNFs/COF-SH/CNTs/GCE was prepared in a three-step method including in situ synthesis, post-synthesis, and one-step electrochemical deposition. The adsorption and catalytic performances of the modified electrode were improved based on the mechanism of “adsorption-catalysis stripping determination”. By combining the excellent catalytic properties of the AuNFs with the good adsorption capacity of COF-SH toward Cu(II), as well as the good conductivity of CNTs, the AuNFs/COF-SH/CNTs/GCE exhibited excellent performance for the determination of Cu(II). Through optimization of the experimental conditions, a low detection limit of 0.47 nM and a wide linear range of 1.6 nM-4.7 μM were obtained. Moreover, the sensor possessed good stability with a relative standard deviation of less than 5% after 20 repeated measurements. The results are consistent with certified values when used for the determination of certified reference materials. In summary, the AuNFs/COF-SH/CNTs/GCE, with high stability and sensitivity, has been successfully applied for the determination of Cu(II) in seawater samples with satisfactory results.
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