Simultaneous electrochemical determination of dihydroxybenzene isomers using electrospun nitrogen-doped carbon nanofiber film electrode
Simultaneous electrochemical determination of dihydroxybenzene isomers using electrospun nitrogen-doped carbon nanofiber film electrode
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DOI：
10.1016/j.snb.2015.10.102
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发表时间：
2016-03-01
影响因子：
8.4
通讯作者：
You, Tianyan
中科院分区：
文献类型：
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作者：
Huang, Jianshe;Zhang, Xueping;You, Tianyan
采用静电纺丝和碳化工艺相结合的方法制备了氮掺杂纳米碳纤维。与静电纺CNFs相比，氮掺杂效应大大减小了纳米纤维的直径，改变了氮原子的存在形式。自支撑的NCNF膜可直接用于制备NCNF膜修饰玻碳电极（NCNF-GCE）。NCNF-GCE对苯二酚（HQ）、邻苯二酚（CC）和间苯二酚（RC）的氧化具有很高的电催化活性。NCNF-GCE优异的电化学性能归因于其大的比表面积、丰富的缺陷位和独特的氮存在形式。采用示差脉冲伏安法同时测定了HQ、CC和RC三元混合物。HQ-CC和CC-RC的峰电位分离分别为104 mV和400 mV。HQ、CC和RC的氧化峰电流与浓度在1-400 μ M、1-400 μ M和2-500 μ M范围内呈线性关系，检出限分别为0.3 μ M、0.4 μ M和0.8 μ M（S/N = 3）。方法用于自来水和湖水中苯二酚3种异构体的同时测定，回收率为96.0-104.4%。(C)2015 Elsevier B. V.版权所有。
Nitrogen-doped carbon nanofibers (NCNFs) were prepared by a simple and efficient method which associated the electrospinning with the aborative designed carbonization process. Compared with electrospun CNFs, nitrogen-doping effect greatly reduced the diameter of nanofibers and changed the existing forms of nitrogen atoms. The free-standing NCNF film could be immediately used to prepare NCNF film modified glassy carbon electrode (NCNF-GCE). NCNF-GCE exhibited high electrocatalytic activity towards the oxidation of hydroquinone (HQ), catechol (CC), and resorcinol (RC). The excellent electrochemical performance of NCNF-GCE was ascribed to the large surface area, abundant defective sites, and unique nitrogen existing forms. Differential pulse voltammetry was used for the simultaneous determination of HQ, CC and RC in their ternary mixture. The separation of peak potentials is 104 mV and 400 mV for HQ-CC and CC-RC, respectively. The oxidation peak currents of HQ, CC and RC are linear to the concentrations over the range of 1-400 mu M, 1-400 mu M and 2-500 mu M with the detection limits of 0.3 mu M, 0.4 mu M, and 0.8 p,M (S/N = 3), respectively. The proposed method was applied to the simultaneous determination of the three dihydroxybenzene isomers in tap water and lake water samples, and the recoveries of 96.0-104.4% were obtained. (C) 2015 Elsevier B.V. All rights reserved.