Xu Hui, Zhang Xiaoli, Zhan Jinhua
School of Chemistry and Chemical Engineering, Shandong University, Jinan 250100, P. R. China.
J Nanosci Nanotechnol. 2010 Nov;10(11):7654-7. doi: 10.1166/jnn.2010.2772.
A facile and reliable electrochemical technique at beta-cyclodextrin incorporated carbon nanotubes modified glassy carbon electrode (beta-CD/CNTs/GCE) was proposed for determination of pentachlorophenol (PCP). The electrochemical behavior of PCP at the beta-CD/CNTs/GCE was investigated by cyclic voltammetry and linear sweep voltammetry. The beta-CD/CNTs/GCE showed good analytical performance characteristics in electrocatalytic oxidation of PCP, compared with the simple carbon nanotube modified electrode (CNTs/GCE) and bare glassy carbon electrode (GCE). After accumulation for 5 min on beta-CD/CNTs/GCE, the peak current increased linearly with the concentration of PCP in the range from 8.0 x 10(-7) to 1.04 x 10(-5) mol/L. The detection limit was 4.0 x 10(-8) mol/L at 3 sigma level. The proposed electrode presented good repeatability for the determination of PCP in artificial wastewater, and the recovery was 97%-103%. This modified electrode combined the advantages of carbon nanotubes and supramolecular cyclodextrin, leading to new capabilities for electrochemical detection of PCP.
提出了一种在β-环糊精修饰的碳纳米管修饰玻碳电极（β-CD/CNTs/GCE）上测定五氯苯酚（PCP）的简便可靠的电化学技术。采用循环伏安法和线性扫描伏安法研究了PCP在β-CD/CNTs/GCE上的电化学行为。与简单的碳纳米管修饰电极（CNTs/GCE）和裸玻碳电极（GCE）相比，β-CD/CNTs/GCE在PCP的电催化氧化中表现出良好的分析性能特征。在β-CD/CNTs/GCE上富集5分钟后，峰电流与PCP浓度在8.0×10⁻⁷至1.04×10⁻⁵mol/L范围内呈线性增加。在3σ水平下检测限为4.0×10⁻⁸mol/L。该修饰电极对人工废水中PCP的测定具有良好的重复性，回收率为97%-103%。这种修饰电极结合了碳纳米管和超分子环糊精的优点，为PCP的电化学检测带来了新的能力。
