Simultaneous voltammetric determination of nitrophenol isomers at ordered mesoporous carbon modified electrode

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• 作者：Tingting Zhang ; Qiaolin Lang ; Dapeng Yang ; Liang Li ; Lingxing Zeng ; Cheng Zheng ; Tie Li ; Mingdeng Wei ; Aihua Liu
• 关键词：Ordered mesoporous carbons ; Voltammetric detection ; Nitrophenol isomers ; Simultaneous determination
• 刊名：Electrochimica Acta
• 出版年：2013
• 出版时间：1 September, 2013
• 年：2013
• 卷：106
• 期：Complete
• 页码：127-134
• 全文大小：2651 K

文摘

In this paper, ordered mesoporous carbons (OMCs) modified glassy carbon electrode (GCE) (OMCs/GCE) was employed to investigate the electrochemical behavior of o-nitrophenol (o-NP), m-nitrophenol (m-NP) and p-nitrophenol (p-NP) in ambient-N₂ phosphate buffer saline. Compared with bare GCE, the OMCs/GCE exhibited obvious electrocatalytic activity towards nitrophenol isomers. The electrochemical reaction mechanism of nitrophenol at the modified electrode was also studied. At OMCs/GCE, the three nitrophenol isomers could be identified and separated successfully and the simultaneous determination was realized by detecting the reduction peaks of their intermediate products (at 0.209 V vs. saturated calomel electrode for p-NP, 0.020 V for m-NP and ?0.201 V for o-NP) with differential pulse voltammetry. Under the optimized experimental conditions, the linear ranges of the calibration curves were 2-90 ¦ÌM for p-NP, 1-100 ¦ÌM for m-NP and 0.5-90 ¦ÌM for o-NP with limits of detection of 0.1 ¦ÌM, 0.06 ¦ÌM and 0.08 ¦ÌM for p-NP, m-NP and o-NP, respectively (S/N = 3). Therefore, the proposed method is simple, rapid, stable, sensitive, specific, reproducible and cost-effective, which can be applicable for real samples detection.