基于碳纳米管修饰电极的二硝基苯酚电化学测定.docVIP

纳米金( 王安亭 韩甜甜 洛阳理工学院环境工程与化学系，471023, 洛阳, 河南 摘 要：多壁碳纳米管(MWCNT)、纳米金溶胶(AuNPs)经混合分散后修饰于玻碳电极表面, 制成复合纳米材料修饰电极。采用循环伏安法研究了2, 4-二硝基苯酚(2, 4-DNP)在该修饰电极上的电化学行为，实验表明复合修饰电极对2, 4-DNP具有良好的电催化作用。循环伏安曲线上观察到一对可逆的氧化还原峰,氧化峰电位为0.183V，还原峰电位为0.125 V。同时,优化了影响2, 4-DNP电化学测量的实验条件。在最佳条件下, 2, 4-DNP的氧化峰电流与其浓度在5.0×10-6～4.0×10-4 mol·L-1范围内呈线性关系，其回归方程= 0.125+0.825C (C, 10-5 mol·L-1, R=0.995)。在此基础,提出了一种直接测定2, 4-DNP的电分析方法, 回收率(104%，准确可靠。通过计时电量法所得到的扩散系数(D）为.08×10-6cm2 ?s-1。 : 碳纳米管; 金纳米粒子; 2, 4-二硝基苯酚; 玻碳电极 中图分类号: O646 文献标识码: A oltammetric Determination of 2, 4-Dinitrophenol by Using Au Nano-Particles / Carbon Nanotubes Modified Electrode WEI Ying-liang(, WANG An-ting, HAN Tian-tian Department of Environment Engineering and Chemistry, Luoyang Institute of Science and Technology, 471023, Luoyang, Henan ABSTRACT Multi-walled carbon nanotubes (MWCNT) and Au nano-particles (AuNPs) were dispersed together, and coated on a glassy carbon electrode (GCE) to fabricate a novel modified electrode. The electrochemical behavior of 2, 4-Dinitrophenol (2, 4-DNP) at this composite modified electrode was discussed by Cyclic Voltammetry (CV). The experiment results indicated that the AuNPs / MWCNT/GCE showed good electrocatalysis to 2, 4-DNP, and a pair of well-defined redox peak was found. The oxidation peak and the reduction peak were observed at the potential of 0.183V and 0.125V, respectively. Simultaneously, the effect factors of the electrochemical determination of 2, 4-DNP were optimized. Under the optimum experiment condition, the linear relationship between the oxidation peak current of 2, 4-DNP and its concentration was obtained within the range of 5.0×10-6～4.0×10-4 mol·L-1.= 0.125+0.825C (C ,10-5 mol·L-1, R=0.995). Based on the linear relationship, the direct electrochemical determination method of 2, 4-DNP was proposed. The recovery was 94.0(104%，accurate and reliable. The diffusion coefficient (D) was further studied by chronocoulometry. Its result was 1.08( 10-6 cm2