【摘要】 制备了纳米金/碳纳米管复合修饰电极,研究了对氯苯酚在此修饰电极上的电化学行为,结果表明对氯苯酚在磷酸盐缓冲液(PBS)中有良好的伏安曲线。在pH为6.5,14μL修饰剂用量,富集时间为30s时,对氯苯酚于0.645V处有一灵敏的氧化峰。在对氯苯酚浓度为9.0×10-7～1.0×10-5mol.L-1时,峰电流与浓度呈良好的线性范围。在扫速为0.01～0.3V.s-1时,氧化峰电流与扫速呈线性关系,表明对氯苯酚的电极反应是受吸附控制的电极过程。计时电量实验中得到电量与时间的平方根的线性关系,其斜率为2.024μC/s1/2,根据Cottrell方程积分式得到扩散系数(D)为4.62×10-7cm2.s-1。根据所推导出的电荷转移数、参与反应的质子数,提出了对氯苯酚的电化学反应过程。更多还原

【Abstract】 In this work,a novel modified electrode,namely,nano-gold/carbon nanotubes composite modified electrode was developed,and the electrochemical behavior of p-chlorophenol(p-CP)at this modified electrode was investigated systematically.The result indicated that p-chlorophenol showed stable voltammetric response in phosphate buffer solution(PBS).A sensitive oxidation peak of p-CP was observed at the potential of 0.645V.The effect factors of the electrochemical response of p-CP,such as solution pH,the amount of modifier and accumulation time and so on were carefully optimized.The results are as follows:pH=6.5,14 μL modifier and 30 seconds accumulation.Under the optimum conditions,a good linear relationship was obtained in the range of 9.0×10-7～1.0×10-5mol·L-1.The oxidation peak current increases linearly with scanning speed in the range of 0.01～0.3V·s-1,which suggesting that the electrochemical oxidation process of p-CP on this modified electrode is absorption-controlled process.Based on chronocoulometry result,the diffusion coefficient(D)could be estimated and the result was 4.62×10-7cm2 ·s-1.According to the proton number and the electron transfer number of p-chlorophenol oxidation,we proposed the probable process of the electrode reaction.更多还原