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首页> 外文期刊>Electroanalysis >Highly Sensitive and Simultaneous Detection of Hydroquinone and Catechol Using Poly(mercaptoacetic acid)/Exfoliated Graphene Composite Film-modified Electrode
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Highly Sensitive and Simultaneous Detection of Hydroquinone and Catechol Using Poly(mercaptoacetic acid)/Exfoliated Graphene Composite Film-modified Electrode

机译：聚巯基乙酸/片状石墨烯复合膜修饰电极高灵敏，同时检测对苯二酚和邻苯二酚

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摘要

Graphene nanosheets were facilely prepared through one-step liquid-phase exfoliation of graphite powder in N,N-dimethylformamide (DMF) with the assistance of sodium citrate, and then employed to modify the surface of glassy carbon electrode (GCE) via solvent evaporation. Subsequently, mercaptoacetic acid (MA) was electrodeposited onto the surface of exfoliated graphene-modified GCE (EG/GCE) to construct a composite film-modified electrode (pMA/EG/GCE). The electrochemical behaviors of hydroquinone (HQ) and catechol (CC) were studied. It was found that the oxidation peak currents of HQ and CC increased obviously on the surface of EG/GCE and pMA/GCE, compared with those on bare GCE. However, the oxidation signals of HQ and CC further enhanced greatly on the surface of pMA/EG/GCE, showing strong synergetic enhancement effects. As a result, a highly sensitive electrochemical method was developed for the simultaneous determination of HQ and CC. The linear range was from 0.1 to 100molL(-1), and the detection limits were 85 and 80nmolL(-1) for HQ and CC (S/N=3).
机译：通过在柠檬酸钠的辅助下在N，N-二甲基甲酰胺（DMF）中一步一步地剥离石墨粉，轻松制备石墨烯纳米片，然后用于通过溶剂蒸发修饰玻璃碳电极（GCE）的表面。随后，将巯基乙酸（MA）电沉积到剥离的石墨烯修饰的GCE（EG / GCE）的表面上，以构建复合膜修饰的电极（pMA / EG / GCE）。研究了对苯二酚（HQ）和邻苯二酚（CC）的电化学行为。结果发现，与裸露的GCE相比，HQ和CC的氧化峰电流在EG / GCE和pMA / GCE的表面明显增加。然而，HQ和CC的氧化信号在pMA / EG / GCE的表面上进一步增强，显示出强大的协同增强作用。结果，开发了一种高灵敏度的电化学方法同时测定HQ和CC。线性范围为0.1至100molL（-1），HQ和CC（S / N = 3）的检出限为85和80nmolL（-1）。

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