化学
电化学气体传感器
石墨烯
电化学
微分脉冲伏安法
铜
介电谱
自来水
循环伏安法
金属有机骨架
玻璃碳
对苯二酚
氧化物
电极
无机化学
检出限
核化学
材料科学
纳米技术
色谱法
有机化学
物理化学
吸附
工程类
环境工程
作者
Jun Li,Jianfei Xia,Feifei Zhang,Zonghua Wang,Qingyun Liu
出处
期刊:Talanta
[Elsevier]
日期:2018-05-01
卷期号:181: 80-86
被引量:141
标识
DOI:10.1016/j.talanta.2018.01.002
摘要
A highly and simply sensitive electrochemical sensor was presented for the simultaneous determination of hydroquinone (HQ) and catechol (CT) in the water based on copper centered metal-organic framework-graphene composites (Cu-MOF-GN) [Cu-MOF = Cu3(BTC)2 (BTC = 1, 3, 5-benzenetricarboxylicacid)] modified glassy carbon electrode (Cu-MOF-GN/GCE). The modification procedure was carried out through casting metal-organic framework-graphene oxide composites (Cu-MOF-GO) on the bare glassy carbon electrode and followed by the transformation of Cu-MOF-GO to Cu-MOF-GN by an electrochemical reduction. The electrochemical behavior of HQ and CT at Cu-MOF-GN/GCE was investigated by cyclic voltammetry (CV), differential pulse voltammetry (DPV) and electrochemical impedance spectroscopy (EIS). Under the optimized conditions, the modified electrode had excellent electrocatalytic activity and high selectivity toward HQ and CT. The electrochemical sensor exhibited a linear response in the same range of 1.0 × 10−6 to 1.0 × 10−3 M with the detection limits of 5.9 × 10−7 M for HQ and 3.3 × 10−7 M for CT (S/N = 3). Four samples of tap water spiked with different concentrations of HQ and CT were considered. The method has been applied to the analysis of these isomers in spiked tap water with recoveries from 99.0 ~ 102.9% and relative standard deviations (RSDs) for 5 successive measurements less than 5% were also acceptable. This method was successfully applied to detect target analytes in the real samples with satisfying results. The MOFs-based sensors in the field of electrochemical sensing held a great promise for routine sensing applications.
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