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首页> 外文期刊>Journal of solid state electrochemistry >Simultaneous determination of catechol and hydroquinone based on poly (diallyldimethylammonium chloride) functionalized graphene-modified glassy carbon electrode
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Simultaneous determination of catechol and hydroquinone based on poly (diallyldimethylammonium chloride) functionalized graphene-modified glassy carbon electrode

机译：聚二烯丙基二甲基氯化铵官能化石墨烯修饰玻碳电极同时测定邻苯二酚和对苯二酚

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摘要

Simultaneous determination of catechol (CC) and hydroquinone (HQ) were investigated by voltammetry based on glassy carbon electrode (GCE) modified by poly (diallyldimethylammonium chloride) (PDDA) functional-ized graphene (PDDA-G). The modified electrode showed excellent sensitivity and selectivity properties for the two dihydroxybenzene isomers. In 0.1 mol/L phosphate buffer solution (PBS, pH 7.0), the oxidation peak potential difference between CC and HQ was 108 mV, and the peaks on the PDDA-G/GCE were three times as high as the ones on graphene-modified glass carbon electrode. Under optimized conditions, the PDDA-G/GCE showed wide linear behaviors in the range of 1×10 ~(-6)-4×10 ~(-4) mol/L for CC and 1×10 ~(-6)-5×10 ~(-4) mol/L for HQ, with the detection limits 2.0×10 ~(-7) mol/L for CC and 2.5×10 ~(-7) mol/L for HQ (S/N=3) in mixture, respectively. Some kinetic parameters, such as the electron transfer number (n), charge transfer coefficient (α), and the apparent heterogeneous electron transfer rate constant (k _s), were calculated. The proposed method was applied to simultaneous determine CC and HQ in real water samples of Yellow River with satisfactory results.
机译：基于聚二烯丙基二甲基氯化铵（PDDA）功能化石墨烯（PDDA-G）修饰的玻璃碳电极（GCE），通过伏安法同时测定了儿茶酚（CC）和对苯二酚（HQ）。改性电极对两种二羟基苯异构体显示出极好的灵敏度和选择性。在0.1 mol / L磷酸盐缓冲溶液（PBS，pH 7.0）中，CC和HQ之间的氧化峰电位差为108 mV，PDDA-G / GCE上的峰高为石墨烯改性峰的三倍。玻璃碳电极。在最佳条件下，PDDA-G / GCE在CC和1×10〜（-6）-之间表现出宽的线性行为，范围为1×10〜（-6）-4×10〜（-4）mol / L。 HQ的检测限为5×10〜（-4）mol / L，CC的检测限为2.0×10〜（-7）mol / L，HQ的检测限为2.5×10〜（-7）mol / L（S / N = 3）分别混合。计算了一些动力学参数，例如电子转移数（n），电荷转移系数（α）和表观异质电子转移速率常数（k_s）。该方法用于黄河实际水样中CC和HQ的同时测定，结果令人满意。

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